diff --git a/app/schemas/de.jeanlucmakiola.agendula.data.tasks.room.TasksDatabase/2.json b/app/schemas/de.jeanlucmakiola.agendula.data.tasks.room.TasksDatabase/2.json
new file mode 100644
index 0000000..0d38395
--- /dev/null
+++ b/app/schemas/de.jeanlucmakiola.agendula.data.tasks.room.TasksDatabase/2.json
@@ -0,0 +1,529 @@
+{
+  "formatVersion": 1,
+  "database": {
+    "version": 2,
+    "identityHash": "14b159c51416ba27653f6320ac7f6f03",
+    "entities": [
+      {
+        "tableName": "accounts",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `display_name` TEXT NOT NULL, `principal_url` TEXT, `home_set_url` TEXT, `username` TEXT, `last_sync_at` INTEGER, `last_sync_error` TEXT)",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "displayName",
+            "columnName": "display_name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "principalUrl",
+            "columnName": "principal_url",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "homeSetUrl",
+            "columnName": "home_set_url",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "username",
+            "columnName": "username",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "lastSyncAt",
+            "columnName": "last_sync_at",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "lastSyncError",
+            "columnName": "last_sync_error",
+            "affinity": "TEXT"
+          }
+        ],
+        "primaryKey": {
+          "autoGenerate": true,
+          "columnNames": [
+            "id"
+          ]
+        }
+      },
+      {
+        "tableName": "task_lists",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `name` TEXT NOT NULL, `color` INTEGER NOT NULL, `account_id` INTEGER, `is_visible` INTEGER NOT NULL DEFAULT 1, `is_synced` INTEGER NOT NULL DEFAULT 1, `owner` TEXT, `is_read_only` INTEGER NOT NULL DEFAULT 0, `sort_order` INTEGER NOT NULL DEFAULT 0, `href` TEXT, `ctag` TEXT, `sync_token` TEXT, `is_dirty` INTEGER NOT NULL DEFAULT 0, FOREIGN KEY(`account_id`) REFERENCES `accounts`(`id`) ON UPDATE NO ACTION ON DELETE SET NULL )",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "name",
+            "columnName": "name",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "color",
+            "columnName": "color",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "accountId",
+            "columnName": "account_id",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "isVisible",
+            "columnName": "is_visible",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "1"
+          },
+          {
+            "fieldPath": "isSynced",
+            "columnName": "is_synced",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "1"
+          },
+          {
+            "fieldPath": "owner",
+            "columnName": "owner",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "isReadOnly",
+            "columnName": "is_read_only",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "0"
+          },
+          {
+            "fieldPath": "sortOrder",
+            "columnName": "sort_order",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "0"
+          },
+          {
+            "fieldPath": "href",
+            "columnName": "href",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "ctag",
+            "columnName": "ctag",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "syncToken",
+            "columnName": "sync_token",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "isDirty",
+            "columnName": "is_dirty",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "0"
+          }
+        ],
+        "primaryKey": {
+          "autoGenerate": true,
+          "columnNames": [
+            "id"
+          ]
+        },
+        "indices": [
+          {
+            "name": "index_task_lists_account_id",
+            "unique": false,
+            "columnNames": [
+              "account_id"
+            ],
+            "orders": [],
+            "createSql": "CREATE INDEX IF NOT EXISTS `index_task_lists_account_id` ON `${TABLE_NAME}` (`account_id`)"
+          }
+        ],
+        "foreignKeys": [
+          {
+            "table": "accounts",
+            "onDelete": "SET NULL",
+            "onUpdate": "NO ACTION",
+            "columns": [
+              "account_id"
+            ],
+            "referencedColumns": [
+              "id"
+            ]
+          }
+        ]
+      },
+      {
+        "tableName": "tasks",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `list_id` INTEGER NOT NULL, `uid` TEXT NOT NULL, `href` TEXT, `etag` TEXT, `title` TEXT, `description` TEXT, `location` TEXT, `url` TEXT, `color` INTEGER, `categories` TEXT NOT NULL DEFAULT '', `status` INTEGER NOT NULL DEFAULT 0, `percent_complete` INTEGER, `completed_at` INTEGER, `priority` INTEGER NOT NULL DEFAULT 0, `classification` INTEGER, `dtstart` INTEGER, `due` INTEGER, `duration` TEXT, `is_all_day` INTEGER NOT NULL DEFAULT 0, `timezone` TEXT, `rrule` TEXT, `rdate` TEXT, `exdate` TEXT, `recurrence_id` INTEGER, `master_id` INTEGER, `parent_id` INTEGER, `sort_order` INTEGER NOT NULL DEFAULT 0, `created_at` INTEGER, `last_modified` INTEGER, `sequence` INTEGER NOT NULL DEFAULT 0, `is_dirty` INTEGER NOT NULL DEFAULT 0, `is_deleted` INTEGER NOT NULL DEFAULT 0, `unknown_properties` TEXT, FOREIGN KEY(`list_id`) REFERENCES `task_lists`(`id`) ON UPDATE NO ACTION ON DELETE CASCADE , FOREIGN KEY(`master_id`) REFERENCES `tasks`(`id`) ON UPDATE NO ACTION ON DELETE CASCADE , FOREIGN KEY(`parent_id`) REFERENCES `tasks`(`id`) ON UPDATE NO ACTION ON DELETE SET NULL )",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "listId",
+            "columnName": "list_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "uid",
+            "columnName": "uid",
+            "affinity": "TEXT",
+            "notNull": true
+          },
+          {
+            "fieldPath": "href",
+            "columnName": "href",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "etag",
+            "columnName": "etag",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "title",
+            "columnName": "title",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "description",
+            "columnName": "description",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "location",
+            "columnName": "location",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "url",
+            "columnName": "url",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "color",
+            "columnName": "color",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "categories",
+            "columnName": "categories",
+            "affinity": "TEXT",
+            "notNull": true,
+            "defaultValue": "''"
+          },
+          {
+            "fieldPath": "status",
+            "columnName": "status",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "0"
+          },
+          {
+            "fieldPath": "percentComplete",
+            "columnName": "percent_complete",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "completedAt",
+            "columnName": "completed_at",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "priority",
+            "columnName": "priority",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "0"
+          },
+          {
+            "fieldPath": "classification",
+            "columnName": "classification",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "dtstart",
+            "columnName": "dtstart",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "due",
+            "columnName": "due",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "duration",
+            "columnName": "duration",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "isAllDay",
+            "columnName": "is_all_day",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "0"
+          },
+          {
+            "fieldPath": "timezone",
+            "columnName": "timezone",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "rrule",
+            "columnName": "rrule",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "rdate",
+            "columnName": "rdate",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "exdate",
+            "columnName": "exdate",
+            "affinity": "TEXT"
+          },
+          {
+            "fieldPath": "recurrenceId",
+            "columnName": "recurrence_id",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "masterId",
+            "columnName": "master_id",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "parentId",
+            "columnName": "parent_id",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "sortOrder",
+            "columnName": "sort_order",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "0"
+          },
+          {
+            "fieldPath": "createdAt",
+            "columnName": "created_at",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "lastModified",
+            "columnName": "last_modified",
+            "affinity": "INTEGER"
+          },
+          {
+            "fieldPath": "sequence",
+            "columnName": "sequence",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "0"
+          },
+          {
+            "fieldPath": "isDirty",
+            "columnName": "is_dirty",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "0"
+          },
+          {
+            "fieldPath": "isDeleted",
+            "columnName": "is_deleted",
+            "affinity": "INTEGER",
+            "notNull": true,
+            "defaultValue": "0"
+          },
+          {
+            "fieldPath": "unknownProperties",
+            "columnName": "unknown_properties",
+            "affinity": "TEXT"
+          }
+        ],
+        "primaryKey": {
+          "autoGenerate": true,
+          "columnNames": [
+            "id"
+          ]
+        },
+        "indices": [
+          {
+            "name": "index_tasks_list_id_is_deleted",
+            "unique": false,
+            "columnNames": [
+              "list_id",
+              "is_deleted"
+            ],
+            "orders": [],
+            "createSql": "CREATE INDEX IF NOT EXISTS `index_tasks_list_id_is_deleted` ON `${TABLE_NAME}` (`list_id`, `is_deleted`)"
+          },
+          {
+            "name": "index_tasks_parent_id",
+            "unique": false,
+            "columnNames": [
+              "parent_id"
+            ],
+            "orders": [],
+            "createSql": "CREATE INDEX IF NOT EXISTS `index_tasks_parent_id` ON `${TABLE_NAME}` (`parent_id`)"
+          },
+          {
+            "name": "index_tasks_master_id_recurrence_id",
+            "unique": false,
+            "columnNames": [
+              "master_id",
+              "recurrence_id"
+            ],
+            "orders": [],
+            "createSql": "CREATE INDEX IF NOT EXISTS `index_tasks_master_id_recurrence_id` ON `${TABLE_NAME}` (`master_id`, `recurrence_id`)"
+          },
+          {
+            "name": "index_tasks_is_dirty",
+            "unique": false,
+            "columnNames": [
+              "is_dirty"
+            ],
+            "orders": [],
+            "createSql": "CREATE INDEX IF NOT EXISTS `index_tasks_is_dirty` ON `${TABLE_NAME}` (`is_dirty`)"
+          },
+          {
+            "name": "index_tasks_list_id_uid_recurrence_id",
+            "unique": true,
+            "columnNames": [
+              "list_id",
+              "uid",
+              "recurrence_id"
+            ],
+            "orders": [],
+            "createSql": "CREATE UNIQUE INDEX IF NOT EXISTS `index_tasks_list_id_uid_recurrence_id` ON `${TABLE_NAME}` (`list_id`, `uid`, `recurrence_id`)"
+          }
+        ],
+        "foreignKeys": [
+          {
+            "table": "task_lists",
+            "onDelete": "CASCADE",
+            "onUpdate": "NO ACTION",
+            "columns": [
+              "list_id"
+            ],
+            "referencedColumns": [
+              "id"
+            ]
+          },
+          {
+            "table": "tasks",
+            "onDelete": "CASCADE",
+            "onUpdate": "NO ACTION",
+            "columns": [
+              "master_id"
+            ],
+            "referencedColumns": [
+              "id"
+            ]
+          },
+          {
+            "table": "tasks",
+            "onDelete": "SET NULL",
+            "onUpdate": "NO ACTION",
+            "columns": [
+              "parent_id"
+            ],
+            "referencedColumns": [
+              "id"
+            ]
+          }
+        ]
+      },
+      {
+        "tableName": "task_alarms",
+        "createSql": "CREATE TABLE IF NOT EXISTS `${TABLE_NAME}` (`id` INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, `task_id` INTEGER NOT NULL, `minutes_before` INTEGER NOT NULL, `reference` TEXT NOT NULL DEFAULT 'DUE', `message` TEXT, FOREIGN KEY(`task_id`) REFERENCES `tasks`(`id`) ON UPDATE NO ACTION ON DELETE CASCADE )",
+        "fields": [
+          {
+            "fieldPath": "id",
+            "columnName": "id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "taskId",
+            "columnName": "task_id",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "minutesBefore",
+            "columnName": "minutes_before",
+            "affinity": "INTEGER",
+            "notNull": true
+          },
+          {
+            "fieldPath": "reference",
+            "columnName": "reference",
+            "affinity": "TEXT",
+            "notNull": true,
+            "defaultValue": "'DUE'"
+          },
+          {
+            "fieldPath": "message",
+            "columnName": "message",
+            "affinity": "TEXT"
+          }
+        ],
+        "primaryKey": {
+          "autoGenerate": true,
+          "columnNames": [
+            "id"
+          ]
+        },
+        "indices": [
+          {
+            "name": "index_task_alarms_task_id",
+            "unique": false,
+            "columnNames": [
+              "task_id"
+            ],
+            "orders": [],
+            "createSql": "CREATE INDEX IF NOT EXISTS `index_task_alarms_task_id` ON `${TABLE_NAME}` (`task_id`)"
+          }
+        ],
+        "foreignKeys": [
+          {
+            "table": "tasks",
+            "onDelete": "CASCADE",
+            "onUpdate": "NO ACTION",
+            "columns": [
+              "task_id"
+            ],
+            "referencedColumns": [
+              "id"
+            ]
+          }
+        ]
+      }
+    ],
+    "setupQueries": [
+      "CREATE TABLE IF NOT EXISTS room_master_table (id INTEGER PRIMARY KEY,identity_hash TEXT)",
+      "INSERT OR REPLACE INTO room_master_table (id,identity_hash) VALUES(42, '14b159c51416ba27653f6320ac7f6f03')"
+    ]
+  }
+}
\ No newline at end of file
diff --git a/app/src/androidTest/assets/tasks-v23.db b/app/src/androidTest/assets/tasks-v23.db
index e305e90..d4e5b53 100644
Binary files a/app/src/androidTest/assets/tasks-v23.db and b/app/src/androidTest/assets/tasks-v23.db differ
diff --git a/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/legacy/OneShotImportTest.kt b/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/legacy/OneShotImportTest.kt
index c040421..36d23a2 100644
--- a/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/legacy/OneShotImportTest.kt
+++ b/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/legacy/OneShotImportTest.kt
@@ -212,6 +212,15 @@ class OneShotImportTest {
         assertThat(db.alarms().all().map { it.message }).doesNotContain("Errands")
     }
 
+    @Test
+    fun importsCategoryPropertiesAsTags() {
+        importer.importFrom(fixture())
+        val tasks = taskRows()
+
+        assertThat(tasks.getValue("Buy milk").categories).containsExactly("Errands")
+        assertThat(tasks.getValue("Ship the release").categories).isEmpty()
+    }
+
     // --- running it -----------------------------------------------------------
 
     @Test
diff --git a/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/room/TasksDatabaseMigrationTest.kt b/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/room/TasksDatabaseMigrationTest.kt
index cf4b272..ca0d824 100644
--- a/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/room/TasksDatabaseMigrationTest.kt
+++ b/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/room/TasksDatabaseMigrationTest.kt
@@ -8,27 +8,7 @@ import org.junit.Rule
 import org.junit.Test
 import org.junit.runner.RunWith
 
-/**
- * The migration harness, proven against the committed schema in `app/schemas/`.
- *
- * There is one schema version today, so all there is to assert is that the helper
- * can build v1 from the exported JSON, seed it, and validate it back — i.e. the
- * export, the assets wiring and the identity hash all line up. That is the point:
- * the first real migration only has to add its own case.
- *
- * **Adding a v1 → v2 case.** When sync adds columns, bump [TasksDatabase]'s
- * `version`, let KSP export `2.json`, declare the `Migration(1, 2)` next to the
- * database, and add a test here shaped like this:
- *
- * ```
- * helper.createDatabase(TEST_DB, 1).use { db ->
- *     db.execSQL("INSERT INTO task_lists (name, color) VALUES ('Groceries', 0)")
- * }
- * helper.runMigrationsAndValidate(TEST_DB, 2, true, MIGRATION_1_2).use { db ->
- *     // read the seeded rows back — validation proves the shape, not the data
- * }
- * ```
- */
+/** Migrations, proven against the committed schemas in `app/schemas/`. */
 @RunWith(AndroidJUnit4::class)
 class TasksDatabaseMigrationTest {
 
@@ -62,6 +42,39 @@ class TasksDatabaseMigrationTest {
         }
     }
 
+    @Test
+    fun liftsCategoriesOutOfTheResidueWithoutDirtyingTheTask() {
+        helper.createDatabase(TEST_DB, 1).use { db ->
+            db.execSQL("INSERT INTO task_lists (id, name, color) VALUES (1, 'Work', 0)")
+            db.execSQL(
+                "INSERT INTO tasks (id, list_id, uid, title, unknown_properties) VALUES (?, 1, ?, ?, ?)",
+                arrayOf<Any?>(1, "uid-1", "Claimed", "X-FOO:bar\r\nCATEGORIES:Work,Home\r\n"),
+            )
+            db.execSQL(
+                "INSERT INTO tasks (id, list_id, uid, title, unknown_properties) VALUES (?, 1, ?, ?, ?)",
+                arrayOf<Any?>(2, "uid-2", "Split", "CATEGORIES:a\r\nCATEGORIES:b\r\n"),
+            )
+            db.execSQL("INSERT INTO tasks (id, list_id, uid, title) VALUES (3, 1, 'uid-3', 'Untagged')")
+        }
+
+        helper.runMigrationsAndValidate(TEST_DB, 2, true, TasksDatabase.MIGRATION_1_2).use { db ->
+            db.query("SELECT categories, unknown_properties, is_dirty FROM tasks ORDER BY id").use { c ->
+                c.moveToNext()
+                assertThat(c.getString(0)).isEqualTo("Work,Home")
+                assertThat(c.getString(1)).doesNotContain("CATEGORIES")
+                assertThat(c.getString(1)).contains("X-FOO:bar")
+                assertThat(c.getInt(2)).isEqualTo(0)
+
+                c.moveToNext()
+                assertThat(c.getString(0)).isEqualTo("a,b")
+                assertThat(c.getString(1)).isEqualTo("CATEGORIES:a\r\nCATEGORIES:b\r\n")
+
+                c.moveToNext()
+                assertThat(c.getString(0)).isEmpty()
+            }
+        }
+    }
+
     private companion object {
         const val TEST_DB = "migration-test.db"
     }
diff --git a/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/transfer/ExternalImportTest.kt b/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/transfer/ExternalImportTest.kt
index 874fc6f..8bc1eb3 100644
--- a/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/transfer/ExternalImportTest.kt
+++ b/app/src/androidTest/java/de/jeanlucmakiola/agendula/data/tasks/transfer/ExternalImportTest.kt
@@ -107,6 +107,17 @@ class ExternalImportTest {
         assertThat(importer.hasRun.first()).isTrue()
     }
 
+    @Test
+    fun copiesTagsCleanedUp() = runBlocking {
+        source.lists = listOf(list(7, "Errands"))
+        source.tasks = mapOf(7L to listOf(task(100, "Milk", tags = listOf("Shop", " Shop ", "", "Home"))))
+
+        importer.run()
+
+        assertThat(db.tasks().tasks(listId = null, includeCompleted = true).single().task.categories)
+            .containsExactly("Shop", "Home").inOrder()
+    }
+
     /** Every list arrives device-only: the account belongs to the sync app. */
     @Test
     fun importedListsAreDeviceOnly() = runBlocking {
@@ -241,6 +252,7 @@ class ExternalImportTest {
         title: String,
         uid: String? = "uid-$id",
         parentId: Long? = null,
+        tags: List<String> = emptyList(),
     ) = ExportTask(
         taskId = id,
         uid = uid,
@@ -260,6 +272,7 @@ class ExternalImportTest {
         rrule = null,
         rdate = null,
         parentId = parentId,
+        tags = tags,
     )
 
     private companion object {
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/di/DataModule.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/di/DataModule.kt
index e36b813..65a744b 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/di/DataModule.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/di/DataModule.kt
@@ -89,6 +89,7 @@ object DataProvideModule {
             // backed-up `.db` does not. The backup rules carry all three files and
             // the app checkpoints on ON_STOP.
             .setJournalMode(RoomDatabase.JournalMode.WRITE_AHEAD_LOGGING)
+            .addMigrations(TasksDatabase.MIGRATION_1_2)
             .build()
 
     /**
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/AndroidTasksDataSource.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/AndroidTasksDataSource.kt
index c317238..b87069c 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/AndroidTasksDataSource.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/AndroidTasksDataSource.kt
@@ -1,5 +1,6 @@
 package de.jeanlucmakiola.agendula.data.tasks
 
+import android.content.ContentProviderOperation
 import android.content.ContentResolver
 import android.content.ContentUris
 import android.content.ContentValues
@@ -19,6 +20,7 @@ import de.jeanlucmakiola.agendula.domain.Task
 import de.jeanlucmakiola.agendula.domain.TaskForm
 import de.jeanlucmakiola.agendula.domain.TaskList
 import de.jeanlucmakiola.agendula.domain.export.ExportTask
+import de.jeanlucmakiola.agendula.domain.normalizeTags
 import de.jeanlucmakiola.agendula.domain.recurrence.ExpansionWindow
 import de.jeanlucmakiola.agendula.domain.recurrence.RecurrenceExpander
 import de.jeanlucmakiola.agendula.domain.recurrence.RecurrenceSpec
@@ -90,11 +92,14 @@ class AndroidTasksDataSource @Inject constructor(
         // `is_recurring` / `distance_from_current`). The by-name mapper reads
         // whatever is present and nulls the rest; the repository re-sorts, so we
         // don't depend on a provider sort column either.
-        return resolver.query(uri, null, selection, args, null)
+        val tasks = resolver.query(uri, null, selection, args, null)
             ?.use { c ->
                 val reader = CursorColumnReader(c)
                 buildList { while (c.moveToNext()) add(TaskMapper.task(reader)) }
             } ?: emptyList()
+        if (tasks.isEmpty()) return tasks
+        val tags = categories(tasks.map { it.taskId })
+        return tasks.map { task -> tags[task.taskId]?.let { task.copy(tags = it) } ?: task }
     }
 
     override fun exportTasks(listId: Long): List<ExportTask> {
@@ -102,7 +107,7 @@ class AndroidTasksDataSource @Inject constructor(
         // table's shape varies across provider versions, and the by-name mapper
         // reads what's there.
         val uri = TasksContract.tasksUri(authority())
-        return resolver.query(
+        val tasks = resolver.query(
             uri,
             null,
             // _deleted marks a row awaiting a sync round-trip. It's gone as far as
@@ -115,21 +120,39 @@ class AndroidTasksDataSource @Inject constructor(
             val reader = CursorColumnReader(c)
             buildList { while (c.moveToNext()) add(TaskMapper.exportTask(reader)) }
         } ?: emptyList()
+        if (tasks.isEmpty()) return tasks
+        val tags = categories(tasks.map { it.taskId })
+        return tasks.map { task -> tags[task.taskId]?.let { task.copy(tags = it) } ?: task }
     }
 
     // --- writes ---------------------------------------------------------------
 
     override fun insertTask(form: TaskForm): Long {
         val values = TaskWriteMapper.seriesValues(form, ZoneId.systemDefault().id)
-        val uri = resolver.insert(TasksContract.tasksUri(authority()), values.toContentValues())
-            ?: throw TaskWriteFailedException("insert task")
-        return uri.lastPathSegment?.toLongOrNull() ?: throw TaskWriteFailedException("insert task: no id")
+        // One batch, so a refused tag leaves no task behind for a retry to duplicate.
+        val authority = authority()
+        val ops = arrayListOf(
+            ContentProviderOperation.newInsert(TasksContract.tasksUri(authority))
+                .withValues(values.toContentValues())
+                .build(),
+        )
+        normalizeTags(form.tags).forEach { tag ->
+            ops += ContentProviderOperation.newInsert(TasksContract.propertiesUri(authority))
+                .withValues(TaskWriteMapper.categoryValues(0, tag).toContentValues().apply { remove(Properties.TASK_ID) })
+                .withValueBackReference(Properties.TASK_ID, 0)
+                .build()
+        }
+        val results = runCatching { resolver.applyBatch(authority, ops) }
+            .getOrElse { throw TaskWriteFailedException("insert task", it) }
+        return results.firstOrNull()?.uri?.lastPathSegment?.toLongOrNull()
+            ?: throw TaskWriteFailedException("insert task: no id")
     }
 
     override fun updateTask(taskId: Long, form: TaskForm) {
         val values = TaskWriteMapper.seriesValues(form, ZoneId.systemDefault().id)
         val rows = resolver.update(taskUri(authority(), taskId), values.toContentValues(), null, null)
         if (rows == 0) throw TaskWriteFailedException("update task $taskId")
+        setCategories(taskId, form.tags)
     }
 
     override fun updateSeries(seriesId: Long, occurrenceStart: Instant, form: TaskForm) {
@@ -151,6 +174,7 @@ class AndroidTasksDataSource @Inject constructor(
             (Tasks.DUE to shifted(anchors?.second, occurrence?.due, form.due))
         val rows = resolver.update(taskUri(authority(), seriesId), values.toContentValues(), null, null)
         if (rows == 0) throw TaskWriteFailedException("update series $seriesId")
+        setCategories(seriesId, form.tags)
     }
 
     /**
@@ -243,8 +267,28 @@ class AndroidTasksDataSource @Inject constructor(
             ?: throw TaskWriteFailedException("update instance $taskId@$occurrenceStart: no such occurrence")
         val values = TaskWriteMapper.instanceValues(form, ZoneId.systemDefault().id)
         val uri = TasksContract.instanceUri(authority(), instanceId)
-        val rows = resolver.update(uri, values.toContentValues(), null, null)
-        if (rows == 0) throw TaskWriteFailedException("update instance $instanceId")
+        // The fork copies the series' properties onto the override, so the tags
+        // go onto the series first and are put back once the override exists.
+        // Unchanged tags are inherited as they are, and the series is left alone.
+        val seriesTags = categories(listOf(taskId))[taskId].orEmpty()
+        val retag = normalizeTags(form.tags) != seriesTags
+        if (retag) setCategories(taskId, form.tags)
+        var failure: Throwable? = null
+        try {
+            val rows = resolver.update(uri, values.toContentValues(), null, null)
+            if (rows == 0) throw TaskWriteFailedException("update instance $instanceId")
+        } catch (e: Throwable) {
+            failure = e
+            throw e
+        } finally {
+            if (retag) {
+                try {
+                    setCategories(taskId, seriesTags)
+                } catch (e: Throwable) {
+                    failure?.addSuppressed(e) ?: throw e
+                }
+            }
+        }
     }
 
     /**
@@ -348,6 +392,58 @@ class AndroidTasksDataSource @Inject constructor(
         } ?: emptyList()
     }
 
+    /** Tags by task id for [taskIds], in stored order. */
+    private fun categories(taskIds: Collection<Long>): Map<Long, List<String>> {
+        val rows = taskIds.distinct().chunked(MAX_SQL_ARGS - 1).flatMap { chunk ->
+            val selection = "${Properties.MIMETYPE} = ? AND ${Properties.TASK_ID} IN (${chunk.joinToString(",") { "?" }})"
+            val args = (listOf(TasksContract.Category.MIMETYPE) + chunk.map(Long::toString)).toTypedArray()
+            resolver.query(
+                TasksContract.propertiesUri(authority()),
+                arrayOf(Properties.TASK_ID, TasksContract.Category.NAME),
+                selection,
+                args,
+                Properties.PROPERTY_ID,
+            )?.use { c ->
+                val reader = CursorColumnReader(c)
+                buildList {
+                    while (c.moveToNext()) {
+                        val id = reader.getLong(Properties.TASK_ID) ?: continue
+                        val name = reader.getString(TasksContract.Category.NAME) ?: continue
+                        add(id to name)
+                    }
+                }
+            } ?: emptyList()
+        }
+        return rows.groupBy({ it.first }, { it.second }).mapValues { normalizeTags(it.value) }
+    }
+
+    /**
+     * Replaces [taskId]'s category rows in one batch, so a refused insert cannot
+     * leave half the tags, and leaves them alone when nothing changed so the task
+     * isn't dirtied.
+     */
+    private fun setCategories(taskId: Long, tags: List<String>) {
+        val wanted = normalizeTags(tags)
+        if (categories(listOf(taskId))[taskId].orEmpty() == wanted) return
+        val authority = authority()
+        val uri = TasksContract.propertiesUri(authority)
+        val ops = arrayListOf(
+            ContentProviderOperation.newDelete(uri)
+                .withSelection(
+                    "${Properties.TASK_ID} = ? AND ${Properties.MIMETYPE} = ?",
+                    arrayOf(taskId.toString(), TasksContract.Category.MIMETYPE),
+                )
+                .build(),
+        )
+        wanted.forEach {
+            ops += ContentProviderOperation.newInsert(uri)
+                .withValues(TaskWriteMapper.categoryValues(taskId, it).toContentValues())
+                .build()
+        }
+        runCatching { resolver.applyBatch(authority, ops) }
+            .getOrElse { throw TaskWriteFailedException("set categories for task $taskId", it) }
+    }
+
     override fun setCancelled(taskId: Long, cancelled: Boolean) {
         val rows = resolver.update(taskUri(authority(), taskId), cancelValues(cancelled).toContentValues(), null, null)
         if (rows == 0) throw TaskWriteFailedException("cancel task $taskId")
@@ -460,3 +556,6 @@ class AndroidTasksDataSource @Inject constructor(
         return cv
     }
 }
+
+/** SQLite's default bound-argument limit on older Android releases. */
+private const val MAX_SQL_ARGS = 999
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/Failures.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/Failures.kt
index d34dae4..608bdc7 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/Failures.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/Failures.kt
@@ -5,8 +5,8 @@ class ProviderUnavailableException :
     IllegalStateException("No tasks provider installed")
 
 /** A ContentResolver write returned no URI or affected no rows. */
-class TaskWriteFailedException(operation: String) :
-    RuntimeException("Task write failed: $operation")
+class TaskWriteFailedException(operation: String, cause: Throwable? = null) :
+    RuntimeException("Task write failed: $operation", cause)
 
 /**
  * The task changed (e.g. a DAVx5 sync or another app) since the edit form loaded
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TaskWriteMapper.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TaskWriteMapper.kt
index e608c59..7413e12 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TaskWriteMapper.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TaskWriteMapper.kt
@@ -113,6 +113,12 @@ object TaskWriteMapper {
         Alarm.ALARM_TYPE to Alarm.TYPE_MESSAGE,
     )
 
+    fun categoryValues(taskId: Long, name: String): Map<String, Any?> = mapOf(
+        Properties.TASK_ID to taskId,
+        Properties.MIMETYPE to TasksContract.Category.MIMETYPE,
+        TasksContract.Category.NAME to name,
+    )
+
     /** The user-owned columns of a list — what an edit is allowed to change. */
     fun listValues(name: String, color: Int): Map<String, Any?> = mapOf(
         Lists.NAME to name.trim(),
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksContract.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksContract.kt
index d3712b1..75f68ee 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksContract.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksContract.kt
@@ -154,6 +154,18 @@ object TasksContract {
         const val TYPE_MESSAGE = 1
     }
 
+    /**
+     * A category property row — one tag. DAVx5 maps these to and from
+     * `CATEGORIES`. Inserting with only [NAME] is enough: the provider looks the
+     * category up in the task's account, or creates it, and fills in `data0`.
+     */
+    object Category {
+        const val MIMETYPE = "vnd.android.cursor.item/category"
+
+        /** `data1` — the tag as spelled. */
+        const val NAME = "data1"
+    }
+
     fun propertiesUri(authority: String): Uri = "content://$authority/${Properties.PATH}".toUri()
 
     // --- status values (TaskColumns.STATUS_*) --------------------------------
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksRepositoryImpl.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksRepositoryImpl.kt
index 9019e3f..516ea70 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksRepositoryImpl.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/TasksRepositoryImpl.kt
@@ -66,6 +66,7 @@ class TasksRepositoryImpl @Inject constructor(
             // Same over-read as Smart: TaskQuery.listId only narrows to one list, so
             // several lists are read in full and membership is filtered in-memory.
             is TaskFilter.OfLists -> TaskQuery(includeCompleted = true)
+            is TaskFilter.Tagged -> TaskQuery(includeCompleted = true)
         }
         val (todayStart, todayEnd) = DayWindow.today(Clock.System.now(), ZoneId.systemDefault())
         val all = SeriesCollapse.visible(dataSource.tasks(query))
@@ -112,6 +113,7 @@ class TasksRepositoryImpl @Inject constructor(
                 parentId = parentId,
                 location = task.location,
                 url = task.url,
+                tags = task.tags,
             ),
         )
         val reminders = dataSource.reminders()[task.taskId].orEmpty()
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoMapper.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoMapper.kt
index 7461de0..084d84b 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoMapper.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoMapper.kt
@@ -9,6 +9,7 @@ import de.jeanlucmakiola.agendula.domain.ical.ICalParser
 import de.jeanlucmakiola.agendula.domain.ical.ICalProperty
 import de.jeanlucmakiola.agendula.domain.ical.ICalSerializer
 import de.jeanlucmakiola.agendula.domain.ical.ICalValues
+import de.jeanlucmakiola.agendula.domain.normalizeTags
 import java.time.ZoneId
 import kotlin.time.Clock
 import kotlin.time.Instant
@@ -81,6 +82,8 @@ object VTodoMapper {
         // Parameterised copies stay in the residue verbatim; authoring the
         // column beside them would emit the same exclusions twice.
         "RDATE", "EXDATE",
+        // Several lines, or one the column would not re-serialise exactly.
+        "CATEGORIES",
     )
 
     /** What a VTODO yields. Row identity ([TaskEntity.id], `listId`) is the caller's. */
@@ -200,6 +203,9 @@ object VTodoMapper {
             CLASS_NAMES.indexOf(classProperty?.value?.trim()?.uppercase()).takeIf { it >= 0 },
         )
 
+        val (categories, categoriesProperty) = readCategories(vtodo)
+        claim(categoriesProperty)
+
         val sequenceProperty = vtodo.property("SEQUENCE")
         val sequence = take(
             sequenceProperty,
@@ -225,6 +231,7 @@ object VTodoMapper {
             title = take(vtodo.property("SUMMARY"), vtodo.property("SUMMARY")?.text()),
             description = take(vtodo.property("DESCRIPTION"), vtodo.property("DESCRIPTION")?.text()),
             location = take(vtodo.property("LOCATION"), vtodo.property("LOCATION")?.text()),
+            categories = categories,
             // URI, not TEXT — escaping it would corrupt a query string.
             url = take(vtodo.property("URL"), vtodo.property("URL")?.value?.trim()),
             status = status,
@@ -284,8 +291,9 @@ object VTodoMapper {
         now: Instant = Clock.System.now(),
     ): ICalComponent {
         val residue = parseResidue(entity.unknownProperties)
+        val residueCategories = normalizeTags(residue.properties("CATEGORIES").flatMap(::categoryValues))
         val keptResidue =
-            residue.properties.filterNot { contradictsResidue(it, residue, entity, parentUid) }
+            residue.properties.filterNot { contradictsResidue(it, residue, residueCategories, entity, parentUid) }
         val suppressed = keptResidue
             .map { it.name.uppercase() }
             .filterTo(mutableSetOf()) { it in SUPPRESSED_BY_RESIDUE }
@@ -307,6 +315,7 @@ object VTodoMapper {
         add("DESCRIPTION", entity.description?.let(ICalValues::escapeText))
         add("LOCATION", entity.location?.let(ICalValues::escapeText))
         add("URL", entity.url)
+        add("CATEGORIES", normalizeTags(entity.categories).takeIf { it.isNotEmpty() }?.let(ICalValues::formatTextList))
 
         add("STATUS", entity.status.toICalName())
         add("PERCENT-COMPLETE", entity.percentComplete?.toString())
@@ -386,6 +395,7 @@ object VTodoMapper {
     private fun contradictsResidue(
         property: ICalProperty,
         residue: ICalComponent,
+        residueCategories: List<String>,
         entity: TaskEntity,
         parentUid: String?,
     ): Boolean {
@@ -433,6 +443,7 @@ object VTodoMapper {
             "PRIORITY" -> entity.priority != PRIORITY_NONE
             "PERCENT-COMPLETE" -> entity.percentComplete != null
             "CLASS" -> entity.classification != null
+            "CATEGORIES" -> entity.categories != residueCategories
             // Not SEQUENCE: it is the organiser's counter and never ours to bump,
             // so the column stays at its fallback and the residue always wins.
             else -> false
@@ -475,6 +486,23 @@ object VTodoMapper {
 
     // -------------------------------------------------------------- helpers
 
+    /**
+     * Every `CATEGORIES` copy's values, merged, and the one line to claim — only
+     * when it is the sole, parameterless copy and the column re-serialises it
+     * byte for byte. Anything else is read for display and stays in the residue.
+     */
+    private fun readCategories(vtodo: ICalComponent): Pair<List<String>, ICalProperty?> {
+        val copies = vtodo.properties("CATEGORIES")
+        val values = normalizeTags(copies.flatMap(::categoryValues))
+        val claimable = copies.singleOrNull()?.takeIf {
+            it.params.isEmpty() && values.isNotEmpty() && ICalValues.formatTextList(values) == it.value
+        }
+        return values to claimable
+    }
+
+    private fun categoryValues(property: ICalProperty): List<String> =
+        normalizeTags(ICalValues.parseTextList(property.value))
+
     private val CLASS_NAMES = listOf("PUBLIC", "PRIVATE", "CONFIDENTIAL")
 
     private class TimeRead(
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/legacy/OneShotImport.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/legacy/OneShotImport.kt
index 9cb0429..d21b9ee 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/legacy/OneShotImport.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/legacy/OneShotImport.kt
@@ -15,6 +15,7 @@ import de.jeanlucmakiola.agendula.data.tasks.room.TaskEntity
 import de.jeanlucmakiola.agendula.data.tasks.room.TaskListEntity
 import de.jeanlucmakiola.agendula.data.tasks.room.TasksDatabase
 import de.jeanlucmakiola.agendula.domain.PRIORITY_NONE
+import de.jeanlucmakiola.agendula.domain.normalizeTags
 import de.jeanlucmakiola.agendula.domain.statusFromInt
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.Flow
@@ -221,12 +222,17 @@ class OneShotImport @Inject constructor(
             }
 
         val alarms = mutableListOf<LegacyAlarm>()
-        db.rawQuery("SELECT task_id, mimetype, data0, data1, data2 FROM Properties", null)
+        val categories = mutableMapOf<Long, MutableList<String>>()
+        db.rawQuery("SELECT task_id, mimetype, data0, data1, data2 FROM Properties ORDER BY property_id", null)
             .use { cursor ->
                 val r = CursorColumnReader(cursor)
                 while (cursor.moveToNext()) {
-                    if (r.getString("mimetype") != ALARM_MIMETYPE) continue
                     val taskId = r.getLong("task_id") ?: continue
+                    if (r.getString("mimetype") == CATEGORY_MIMETYPE) {
+                        r.getString("data1")?.let { categories.getOrPut(taskId, ::mutableListOf) += it }
+                        continue
+                    }
+                    if (r.getString("mimetype") != ALARM_MIMETYPE) continue
                     val minutes = r.getString("data0")?.trim()?.toIntOrNull() ?: continue
                     alarms += LegacyAlarm(
                         taskId = taskId,
@@ -241,7 +247,7 @@ class OneShotImport @Inject constructor(
                 }
             }
 
-        return LegacySnapshot(lists, rows, alarms)
+        return LegacySnapshot(lists, rows, alarms, categories.mapValues { normalizeTags(it.value) })
     }
 
     // --- writing into Room ----------------------------------------------------
@@ -276,7 +282,12 @@ class OneShotImport @Inject constructor(
             // the unique index; a fresh uid costs the row nothing it still has.
             val uid = row.entity.uid.takeIf { seen.add(Triple(listId, it, recurrenceId)) }
                 ?: UUID.randomUUID().toString()
-            val entity = row.entity.copy(listId = listId, uid = uid, recurrenceId = recurrenceId)
+            val entity = row.entity.copy(
+                listId = listId,
+                uid = uid,
+                recurrenceId = recurrenceId,
+                categories = snapshot.categories[row.id].orEmpty(),
+            )
             val newId = taskDao.insert(entity)
             taskIds[row.id] = newId
             inserted += row to entity.copy(id = newId)
@@ -379,6 +390,7 @@ class OneShotImport @Inject constructor(
         const val ARCHIVE_NAME = "tasks.db.imported"
 
         private const val ALARM_MIMETYPE = "vnd.android.cursor.item/alarm"
+        private const val CATEGORY_MIMETYPE = "vnd.android.cursor.item/category"
         private const val REFERENCE_START = "2"
         private val SIDECARS = listOf("-journal", "-wal", "-shm")
         private val IMPORT_DONE = booleanPreferencesKey("legacy_import_done")
@@ -391,6 +403,8 @@ private class LegacySnapshot(
     val lists: List<LegacyList>,
     val tasks: List<LegacyTaskRow>,
     val alarms: List<LegacyAlarm>,
+    /** Tags by legacy task `_id`. */
+    val categories: Map<Long, List<String>>,
 )
 
 private class LegacyList(val id: Long, val entity: TaskListEntity)
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/CategoriesLift.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/CategoriesLift.kt
new file mode 100644
index 0000000..a656cbf
--- /dev/null
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/CategoriesLift.kt
@@ -0,0 +1,44 @@
+package de.jeanlucmakiola.agendula.data.tasks.room
+
+import de.jeanlucmakiola.agendula.domain.ical.ICalComponent
+import de.jeanlucmakiola.agendula.domain.ical.ICalParser
+import de.jeanlucmakiola.agendula.domain.ical.ICalProperty
+import de.jeanlucmakiola.agendula.domain.ical.ICalSerializer
+import de.jeanlucmakiola.agendula.domain.ical.ICalValues
+
+/**
+ * Lifts `CATEGORIES` out of a residue written before v2 claimed it.
+ *
+ * ⚠️ Frozen with [TasksDatabase.MIGRATION_1_2]. The claim rule is copied here
+ * rather than shared with the mapper, so a later change to what the mapper
+ * claims cannot change what this migration produced for an earlier upgrader.
+ */
+internal object CategoriesLift {
+
+    /**
+     * Every copy's values merged, and the residue with the one claimed line
+     * removed — or `null` for the residue when nothing was claimed, so the caller
+     * leaves the stored one alone.
+     */
+    data class Result(val categories: List<String>, val residue: String?, val claimed: Boolean)
+
+    fun lift(residue: String?): Result {
+        val component = parse(residue) ?: return Result(emptyList(), residue, claimed = false)
+        val copies = component.properties.filter { it.name.equals("CATEGORIES", ignoreCase = true) }
+        val values = copies.flatMap(::values)
+        val claim = copies.singleOrNull()?.takeIf {
+            it.params.isEmpty() && values.isNotEmpty() && ICalValues.formatTextList(values) == it.value
+        } ?: return Result(values, residue, claimed = false)
+        val rest = ICalSerializer.serializeProperties(component.properties.filterNot { it === claim }) +
+            ICalSerializer.serializeAll(component.components)
+        return Result(values, rest.ifEmpty { null }, claimed = true)
+    }
+
+    private fun values(property: ICalProperty): List<String> =
+        ICalValues.parseTextList(property.value).map(String::trim).filter(String::isNotEmpty).distinct()
+
+    private fun parse(text: String?): ICalComponent? {
+        if (text.isNullOrEmpty()) return null
+        return runCatching { ICalParser.parse("BEGIN:VTODO\r\n$text\r\nEND:VTODO\r\n") }.getOrNull()
+    }
+}
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/Converters.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/Converters.kt
index f4eae17..caf307d 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/Converters.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/Converters.kt
@@ -2,6 +2,8 @@ package de.jeanlucmakiola.agendula.data.tasks.room
 
 import androidx.room.TypeConverter
 import de.jeanlucmakiola.agendula.domain.TaskStatus
+import de.jeanlucmakiola.agendula.domain.ical.ICalValues
+import de.jeanlucmakiola.agendula.domain.normalizeTags
 import de.jeanlucmakiola.agendula.domain.statusFromInt
 import de.jeanlucmakiola.agendula.domain.toInt
 import kotlin.time.Instant
@@ -36,3 +38,17 @@ object Converters {
     fun alarmReferenceFrom(value: String): AlarmReference =
         runCatching { AlarmReference.valueOf(value) }.getOrDefault(AlarmReference.DUE)
 }
+
+/**
+ * [TaskEntity.categories] stored as a `CATEGORIES` value, so escaping has one
+ * home; empty when there are none. Scoped to that field rather than the
+ * database, so no other `List<String>` picks up iCalendar escaping by accident.
+ */
+object CategoriesConverter {
+    @TypeConverter
+    fun toText(value: List<String>): String = ICalValues.formatTextList(normalizeTags(value))
+
+    @TypeConverter
+    fun fromText(value: String): List<String> =
+        if (value.isEmpty()) emptyList() else normalizeTags(ICalValues.parseTextList(value))
+}
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/Entities.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/Entities.kt
index ed2c206..513efc1 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/Entities.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/Entities.kt
@@ -5,6 +5,7 @@ import androidx.room.Entity
 import androidx.room.ForeignKey
 import androidx.room.Index
 import androidx.room.PrimaryKey
+import androidx.room.TypeConverters
 import de.jeanlucmakiola.agendula.domain.PRIORITY_NONE
 import de.jeanlucmakiola.agendula.domain.TaskStatus
 import kotlin.time.Instant
@@ -143,6 +144,10 @@ data class TaskEntity(
     @ColumnInfo(name = "url") val url: String? = null,
     /** ARGB override for the list colour. */
     @ColumnInfo(name = "color") val color: Int? = null,
+    /** RFC 5545 `CATEGORIES` — the tags — in the spelling each task carries them. */
+    @ColumnInfo(name = "categories", defaultValue = "")
+    @field:TypeConverters(CategoriesConverter::class)
+    val categories: List<String> = emptyList(),
 
     // state
     @ColumnInfo(name = "status", defaultValue = "0") val status: TaskStatus = TaskStatus.NEEDS_ACTION,
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/RoomTaskMapper.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/RoomTaskMapper.kt
index dffe701..5ef7233 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/RoomTaskMapper.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/RoomTaskMapper.kt
@@ -49,6 +49,7 @@ object RoomTaskMapper {
         description = row.task.description,
         location = row.task.location,
         url = row.task.url,
+        tags = row.task.categories,
         priority = priorityFromICal(row.task.priority),
         status = row.task.status,
         percentComplete = row.task.percentComplete,
@@ -79,6 +80,7 @@ object RoomTaskMapper {
         description = task.description,
         location = task.location,
         url = task.url,
+        tags = task.categories,
         priority = priorityFromICal(task.priority),
         status = task.status,
         percentComplete = task.percentComplete,
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/TaskFormWriter.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/TaskFormWriter.kt
index d0729f9..18d4392 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/TaskFormWriter.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/TaskFormWriter.kt
@@ -3,6 +3,7 @@ package de.jeanlucmakiola.agendula.data.tasks.room
 import de.jeanlucmakiola.agendula.domain.TaskForm
 import de.jeanlucmakiola.agendula.domain.TaskStatus
 import de.jeanlucmakiola.agendula.domain.ical.ICalValues
+import de.jeanlucmakiola.agendula.domain.normalizeTags
 import de.jeanlucmakiola.agendula.domain.toICal
 import kotlin.time.Duration.Companion.days
 import kotlin.time.Duration.Companion.seconds
@@ -50,6 +51,7 @@ object TaskFormWriter {
             description = form.description?.trim()?.ifBlank { null },
             location = form.location?.trim()?.ifBlank { null },
             url = form.url?.trim()?.ifBlank { null },
+            categories = normalizeTags(form.tags),
             priority = form.priority.toICal(),
             percentComplete = percent,
             status = statusFor(percent, current.status),
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/TasksDatabase.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/TasksDatabase.kt
index 7d6e597..a203d11 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/TasksDatabase.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/room/TasksDatabase.kt
@@ -3,6 +3,8 @@ package de.jeanlucmakiola.agendula.data.tasks.room
 import androidx.room.Database
 import androidx.room.RoomDatabase
 import androidx.room.TypeConverters
+import androidx.room.migration.Migration
+import androidx.sqlite.db.SupportSQLiteDatabase
 
 /**
  * Agendula's own task store. Four tables, designed from
@@ -18,7 +20,7 @@ import androidx.room.TypeConverters
         TaskEntity::class,
         TaskAlarmEntity::class,
     ],
-    version = 1,
+    version = 2,
     exportSchema = true,
 )
 @TypeConverters(Converters::class)
@@ -30,5 +32,36 @@ abstract class TasksDatabase : RoomDatabase() {
 
     companion object {
         const val NAME = "agendula-tasks.db"
+
+        /**
+         * v2 adds `categories`. Until then `CATEGORIES` lived in the residue, and
+         * an unchanged task is never downloaded again, so the values are lifted
+         * out here. Not marked dirty: nothing changed on the server's side.
+         */
+        val MIGRATION_1_2 = object : Migration(1, 2) {
+            override fun migrate(db: SupportSQLiteDatabase) {
+                db.execSQL("ALTER TABLE tasks ADD COLUMN categories TEXT NOT NULL DEFAULT ''")
+                val lifted = mutableListOf<Pair<Long, CategoriesLift.Result>>()
+                db.query(
+                    "SELECT id, unknown_properties FROM tasks WHERE unknown_properties LIKE '%CATEGORIES%'",
+                ).use { cursor ->
+                    while (cursor.moveToNext()) {
+                        val result = CategoriesLift.lift(cursor.getString(1))
+                        if (result.categories.isNotEmpty()) lifted += cursor.getLong(0) to result
+                    }
+                }
+                lifted.forEach { (id, result) ->
+                    val categories = CategoriesConverter.toText(result.categories)
+                    if (result.claimed) {
+                        db.execSQL(
+                            "UPDATE tasks SET categories = ?, unknown_properties = ? WHERE id = ?",
+                            arrayOf<Any?>(categories, result.residue, id),
+                        )
+                    } else {
+                        db.execSQL("UPDATE tasks SET categories = ? WHERE id = ?", arrayOf<Any?>(categories, id))
+                    }
+                }
+            }
+        }
     }
 }
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/transfer/ExternalImport.kt b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/transfer/ExternalImport.kt
index 8803571..1585bb0 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/transfer/ExternalImport.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/data/tasks/transfer/ExternalImport.kt
@@ -16,6 +16,7 @@ import de.jeanlucmakiola.agendula.data.tasks.room.TaskListEntity
 import de.jeanlucmakiola.agendula.data.tasks.room.TasksDatabase
 import de.jeanlucmakiola.agendula.domain.TaskList
 import de.jeanlucmakiola.agendula.domain.export.ExportTask
+import de.jeanlucmakiola.agendula.domain.normalizeTags
 import de.jeanlucmakiola.agendula.domain.toICal
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.flow.Flow
@@ -213,6 +214,7 @@ class ExternalImport @Inject constructor(
         description = description,
         location = location,
         url = url,
+        categories = normalizeTags(tags),
         status = status,
         percentComplete = percentComplete,
         completedAt = completedAt,
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/domain/Models.kt b/app/src/main/java/de/jeanlucmakiola/agendula/domain/Models.kt
index 05b70db..35de203 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/domain/Models.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/domain/Models.kt
@@ -52,6 +52,8 @@ data class Task(
     val description: String?,
     val location: String?,
     val url: String?,
+    /** `CATEGORIES`, as the task spells them. */
+    val tags: List<String> = emptyList(),
     val priority: Priority,
     val status: TaskStatus,
     val percentComplete: Int?,
@@ -161,3 +163,10 @@ fun TaskStatus.toInt(): Int = when (this) {
     TaskStatus.COMPLETED -> ICalStatus.COMPLETED
     TaskStatus.CANCELLED -> ICalStatus.CANCELLED
 }
+
+/** Tags as every writer stores them: trimmed, no blanks, each spelling once, order kept. */
+fun normalizeTags(tags: List<String>): List<String> = tags.map(String::trim).filter(String::isNotEmpty).distinct()
+
+/** Every tag on [tasks], each spelling once, alphabetically ignoring case. */
+fun tagsInUse(tasks: Iterable<Task>): List<String> =
+    tasks.flatMap { it.tags }.distinct().sortedWith(String.CASE_INSENSITIVE_ORDER)
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/domain/TaskFilter.kt b/app/src/main/java/de/jeanlucmakiola/agendula/domain/TaskFilter.kt
index 077c67d..9ce9d61 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/domain/TaskFilter.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/domain/TaskFilter.kt
@@ -5,12 +5,14 @@ import kotlin.time.Instant
 /** The built-in "smart" lists, computed from due dates rather than membership. */
 enum class SmartList { ALL, TODAY, UPCOMING, OVERDUE, NO_DATE, COMPLETED }
 
-/** What a task screen is showing: one real list, or a smart list. */
+/** What a task screen is showing: one real list, a smart list, or a tag. */
 sealed interface TaskFilter {
     data class OfList(val listId: Long) : TaskFilter
     /** Several lists shown together, e.g. one widget covering more than one list. */
     data class OfLists(val listIds: Set<Long>) : TaskFilter
     data class Smart(val list: SmartList) : TaskFilter
+    /** Every task carrying [tag], open and completed, across all lists. */
+    data class Tagged(val tag: String) : TaskFilter
 }
 
 /**
@@ -25,8 +27,12 @@ object TaskFiltering {
             is TaskFilter.OfList -> task.listId == filter.listId
             is TaskFilter.OfLists -> task.listId in filter.listIds
             is TaskFilter.Smart -> matchesSmart(task, filter.list, todayStart, todayEnd)
+            is TaskFilter.Tagged -> filter.tag in task.tags
         }
 
+    /** Whether [task] carries every one of [tags]; an empty set matches everything. */
+    fun hasAllTags(task: Task, tags: Set<String>): Boolean = task.tags.containsAll(tags)
+
     private fun matchesSmart(task: Task, list: SmartList, todayStart: Instant, todayEnd: Instant): Boolean {
         val due = task.due
         return when (list) {
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/domain/TaskForm.kt b/app/src/main/java/de/jeanlucmakiola/agendula/domain/TaskForm.kt
index c0c1c69..9adec18 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/domain/TaskForm.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/domain/TaskForm.kt
@@ -22,6 +22,7 @@ data class TaskForm(
     val reminders: List<Int> = emptyList(),
     val location: String? = null,
     val url: String? = null,
+    val tags: List<String> = emptyList(),
     /** The series' `RRULE` value; `null` = does not repeat. Ignored for a single-occurrence edit. */
     val rrule: String? = null,
 ) {
@@ -44,7 +45,7 @@ enum class TaskFormError { BLANK_TITLE, NO_LIST, DUE_BEFORE_START, REMINDER_WITH
  * a setting; the rest unfold on demand. Declaring these as an enum keeps the
  * disclosure generic, so adding a field later is one entry plus its card.
  */
-enum class TaskFormField { Description, Recurrence, Priority, Progress, Parent, Reminder, Location, Url }
+enum class TaskFormField { Description, Recurrence, Priority, Progress, Parent, Reminder, Location, Url, Tags }
 
 /** The optional fields that already carry a value — auto-revealed when editing. */
 fun TaskForm.populatedFields(): Set<TaskFormField> = buildSet {
@@ -56,4 +57,5 @@ fun TaskForm.populatedFields(): Set<TaskFormField> = buildSet {
     if (rrule != null) add(TaskFormField.Recurrence)
     if (!location.isNullOrBlank()) add(TaskFormField.Location)
     if (!url.isNullOrBlank()) add(TaskFormField.Url)
+    if (tags.isNotEmpty()) add(TaskFormField.Tags)
 }
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/domain/export/ExportModels.kt b/app/src/main/java/de/jeanlucmakiola/agendula/domain/export/ExportModels.kt
index 153a34c..8bc65a7 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/domain/export/ExportModels.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/domain/export/ExportModels.kt
@@ -42,6 +42,7 @@ data class ExportTask(
     val rdate: String?,
     /** `tasks._id` of the parent, for `RELATED-TO;RELTYPE=PARENT`. */
     val parentId: Long?,
+    val tags: List<String> = emptyList(),
 )
 
 /** A task list and everything in it, ready to become one `.ics` document. */
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/domain/export/ICalendarWriter.kt b/app/src/main/java/de/jeanlucmakiola/agendula/domain/export/ICalendarWriter.kt
index e2700a4..bdd16e2 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/domain/export/ICalendarWriter.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/domain/export/ICalendarWriter.kt
@@ -88,6 +88,7 @@ object ICalendarWriter {
         task.location?.takeIf { it.isNotBlank() }?.let { property("LOCATION", it) }
         // URL is a URI, not TEXT: it must not be escaped like one.
         task.url?.takeIf { it.isNotBlank() }?.let { rawProperty("URL", it) }
+        task.tags.takeIf { it.isNotEmpty() }?.let { rawProperty("CATEGORIES", ICalValues.formatTextList(it)) }
 
         task.start?.let { dateProperty("DTSTART", it, task.isAllDay) }
         task.due?.let { dateProperty("DUE", it, task.isAllDay) }
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/domain/ical/ICalValues.kt b/app/src/main/java/de/jeanlucmakiola/agendula/domain/ical/ICalValues.kt
index 037eb5e..32422f8 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/domain/ical/ICalValues.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/domain/ical/ICalValues.kt
@@ -49,6 +49,37 @@ object ICalValues {
         return out.toString()
     }
 
+    /**
+     * A multi-valued TEXT property (`CATEGORIES`, §3.8.1.2): split on the
+     * commas that are not escaped, then unescape each value.
+     */
+    fun parseTextList(value: String): List<String> {
+        val values = mutableListOf<String>()
+        val current = StringBuilder()
+        var i = 0
+        while (i < value.length) {
+            val c = value[i]
+            when {
+                c == '\\' && i + 1 < value.length -> {
+                    current.append(c).append(value[i + 1])
+                    i += 2
+                    continue
+                }
+                c == ',' -> {
+                    values += unescapeText(current.toString())
+                    current.clear()
+                }
+                else -> current.append(c)
+            }
+            i++
+        }
+        values += unescapeText(current.toString())
+        return values
+    }
+
+    /** The inverse of [parseTextList]. */
+    fun formatTextList(values: List<String>): String = values.joinToString(",", transform = ::escapeText)
+
     /** How a DATE / DATE-TIME property was written, and whether we can reproduce it. */
     sealed interface TimeValue {
         /** `VALUE=DATE` — date-only. */
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/common/FormFieldVisuals.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/common/FormFieldVisuals.kt
index b376caf..5fb8649 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/common/FormFieldVisuals.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/common/FormFieldVisuals.kt
@@ -9,6 +9,7 @@ import androidx.compose.material.icons.rounded.LocationOn
 import androidx.compose.material.icons.rounded.Notifications
 import androidx.compose.material.icons.rounded.Percent
 import androidx.compose.material.icons.rounded.Repeat
+import androidx.compose.material.icons.rounded.Sell
 import androidx.compose.ui.graphics.vector.ImageVector
 import de.jeanlucmakiola.agendula.R
 import de.jeanlucmakiola.agendula.domain.TaskFormField
@@ -23,6 +24,7 @@ fun TaskFormField.labelRes(): Int = when (this) {
     TaskFormField.Reminder -> R.string.edit_reminder_label
     TaskFormField.Location -> R.string.edit_location_label
     TaskFormField.Url -> R.string.edit_url_label
+    TaskFormField.Tags -> R.string.edit_tags_label
 }
 
 fun TaskFormField.icon(): ImageVector = when (this) {
@@ -34,4 +36,5 @@ fun TaskFormField.icon(): ImageVector = when (this) {
     TaskFormField.Reminder -> Icons.Rounded.Notifications
     TaskFormField.Location -> Icons.Rounded.LocationOn
     TaskFormField.Url -> Icons.Rounded.Link
+    TaskFormField.Tags -> Icons.Rounded.Sell
 }
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/common/TagChip.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/common/TagChip.kt
new file mode 100644
index 0000000..accde3a
--- /dev/null
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/common/TagChip.kt
@@ -0,0 +1,57 @@
+package de.jeanlucmakiola.agendula.ui.common
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+
+/**
+ * A pill naming one tag. Solid secondary by default so it reads against any card;
+ * [muted] is the quieter tonal look for something not yet applied, like a suggestion.
+ */
+@Composable
+fun TagChip(
+    name: String,
+    modifier: Modifier = Modifier,
+    muted: Boolean = false,
+    icon: ImageVector? = null,
+    iconContentDescription: String? = null,
+    onClick: (() -> Unit)? = null,
+) {
+    val container = if (muted) MaterialTheme.colorScheme.secondaryContainer else MaterialTheme.colorScheme.secondary
+    val content = if (muted) MaterialTheme.colorScheme.onSecondaryContainer else MaterialTheme.colorScheme.onSecondary
+    val shape = RoundedCornerShape(50)
+    val body: @Composable () -> Unit = {
+        Row(
+            verticalAlignment = Alignment.CenterVertically,
+            horizontalArrangement = Arrangement.spacedBy(4.dp),
+            modifier = Modifier.padding(start = 12.dp, end = if (icon != null) 8.dp else 12.dp, top = 6.dp, bottom = 6.dp),
+        ) {
+            Text(
+                text = name,
+                style = MaterialTheme.typography.labelLarge,
+                maxLines = 1,
+                overflow = TextOverflow.Ellipsis,
+            )
+            if (icon != null) {
+                Icon(icon, contentDescription = iconContentDescription, modifier = Modifier.size(16.dp))
+            }
+        }
+    }
+    if (onClick != null) {
+        Surface(onClick = onClick, color = container, contentColor = content, shape = shape, modifier = modifier) { body() }
+    } else {
+        Surface(color = container, contentColor = content, shape = shape, modifier = modifier) { body() }
+    }
+}
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/detail/TaskDetailScreen.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/detail/TaskDetailScreen.kt
index 0bf1661..8a191a4 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/detail/TaskDetailScreen.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/detail/TaskDetailScreen.kt
@@ -7,6 +7,8 @@ import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.foundation.text.KeyboardActions
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.FlowRow
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.ColumnScope
@@ -42,6 +44,7 @@ import android.net.Uri
 import androidx.compose.foundation.text.selection.SelectionContainer
 import androidx.compose.material.icons.rounded.Info
 import androidx.compose.material.icons.rounded.Link
+import androidx.compose.material.icons.rounded.Sell
 import androidx.compose.material.icons.rounded.LocationOn
 import androidx.compose.material.icons.rounded.Notifications
 import androidx.compose.material.icons.rounded.Repeat
@@ -60,6 +63,7 @@ import de.jeanlucmakiola.agendula.domain.TaskStatus
 import de.jeanlucmakiola.agendula.domain.recurrence.RecurringScope
 import de.jeanlucmakiola.agendula.ui.common.LocalUse24HourFormat
 import de.jeanlucmakiola.agendula.ui.common.RecurringScopeDialog
+import de.jeanlucmakiola.agendula.ui.common.TagChip
 import de.jeanlucmakiola.agendula.ui.common.linkified
 import de.jeanlucmakiola.agendula.ui.common.recurrenceText
 import de.jeanlucmakiola.agendula.ui.common.reminderLeadTimeLabel
@@ -97,6 +101,7 @@ import de.jeanlucmakiola.agendula.R
 import de.jeanlucmakiola.agendula.domain.readableDescription
 import de.jeanlucmakiola.agendula.domain.Task
 import de.jeanlucmakiola.agendula.domain.TaskDetail
+import de.jeanlucmakiola.floret.components.revealOnFocus
 import de.jeanlucmakiola.floret.components.GroupedSurface
 import de.jeanlucmakiola.agendula.ui.common.PriorityChip
 import de.jeanlucmakiola.floret.time.formatDate
@@ -240,6 +245,7 @@ fun TaskDetailScreen(
     }
 }
 
+@OptIn(ExperimentalLayoutApi::class)
 @Composable
 private fun DetailBody(
     detail: TaskDetail,
@@ -453,6 +459,19 @@ private fun DetailBody(
                 }
             }
 
+            if (task.tags.isNotEmpty()) {
+                add {
+                    DetailCard(icon = Icons.Rounded.Sell, iconContentDescription = stringResource(R.string.edit_tags_label)) {
+                        FlowRow(
+                            horizontalArrangement = Arrangement.spacedBy(6.dp),
+                            verticalArrangement = Arrangement.spacedBy(6.dp),
+                        ) {
+                            task.tags.forEach { TagChip(it) }
+                        }
+                    }
+                }
+            }
+
             // Description — selectable, with its links tappable.
             task.description?.readableDescription()?.takeIf { it.isNotBlank() }?.let { description ->
                 add {
@@ -606,7 +625,7 @@ private fun AddSubtaskField(onAdd: (String) -> Unit) {
     }
     val accentOn = MaterialTheme.colorScheme.onPrimaryContainer
     Row(
-        modifier = Modifier.fillMaxWidth().heightIn(min = 56.dp).padding(start = 8.dp, end = 8.dp),
+        modifier = Modifier.fillMaxWidth().heightIn(min = 56.dp).revealOnFocus().padding(start = 8.dp, end = 8.dp),
         verticalAlignment = Alignment.CenterVertically,
     ) {
         Box(modifier = Modifier.size(48.dp), contentAlignment = Alignment.Center) {
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditScreen.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditScreen.kt
index f8feec8..62d6856 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditScreen.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditScreen.kt
@@ -1,9 +1,25 @@
 package de.jeanlucmakiola.agendula.ui.edit
 
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.slideInVertically
+import androidx.compose.animation.slideOutVertically
+import androidx.compose.foundation.ScrollState
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.mutableIntStateOf
+import androidx.compose.ui.layout.onPlaced
+import androidx.compose.ui.layout.positionInParent
+import androidx.compose.ui.text.style.TextOverflow
+import de.jeanlucmakiola.agendula.ui.common.TagChip
 import de.jeanlucmakiola.agendula.ui.common.LocalFirstDayOfWeek
 import de.jeanlucmakiola.agendula.ui.common.LocalUse24HourFormat
 import androidx.activity.compose.BackHandler
 import androidx.compose.material.icons.rounded.Link
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.FlowRow
+import androidx.compose.material.icons.rounded.Sell
+import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.material.icons.rounded.LocationOn
 import androidx.compose.material.icons.rounded.Repeat
 import androidx.compose.ui.text.AnnotatedString
@@ -15,6 +31,7 @@ import de.jeanlucmakiola.agendula.ui.common.icon
 import de.jeanlucmakiola.agendula.ui.common.labelRes
 import de.jeanlucmakiola.agendula.ui.common.recurrenceText
 import de.jeanlucmakiola.agendula.ui.common.reminderLeadTimeLabel
+import de.jeanlucmakiola.floret.components.revealOnFocus
 import de.jeanlucmakiola.floret.components.FullScreenPicker
 import de.jeanlucmakiola.floret.components.GroupedListInset
 import de.jeanlucmakiola.floret.components.GroupedSectionHeader
@@ -153,11 +170,25 @@ fun TaskEditScreen(
     val requestBack = { if (state.isDirty && !state.saved) showDiscard = true else onBack() }
     BackHandler(enabled = state.isDirty && !state.saved) { showDiscard = true }
 
+    // Once the title field scrolls away it rides in the bar, so a long form never
+    // loses track of which task is being edited.
+    val scroll = rememberScrollState()
+    var titleBottom by remember { mutableIntStateOf(Int.MAX_VALUE) }
+    val titleInBar by remember { derivedStateOf { scroll.value > titleBottom } }
+
     Scaffold(
         modifier = modifier,
         topBar = {
             TopAppBar(
-                title = {},
+                title = {
+                    AnimatedVisibility(
+                        visible = titleInBar && state.title.isNotBlank(),
+                        enter = fadeIn() + slideInVertically { it / 2 },
+                        exit = fadeOut() + slideOutVertically { it / 2 },
+                    ) {
+                        Text(state.title, maxLines = 1, overflow = TextOverflow.Ellipsis)
+                    }
+                },
                 navigationIcon = {
                     IconButton(onClick = requestBack) {
                         Icon(Icons.Rounded.Close, contentDescription = stringResource(R.string.close))
@@ -180,6 +211,8 @@ fun TaskEditScreen(
         EditContent(
             state = state,
             viewModel = viewModel,
+            scroll = scroll,
+            onTitleBottom = { titleBottom = it },
             modifier = Modifier.padding(inner),
         )
     }
@@ -220,6 +253,8 @@ private enum class PickerTarget { Start, Due }
 private fun EditContent(
     state: TaskEditUiState,
     viewModel: TaskEditViewModel,
+    scroll: ScrollState,
+    onTitleBottom: (Int) -> Unit,
     modifier: Modifier = Modifier,
 ) {
     val dark = isSystemInDarkTheme()
@@ -250,7 +285,7 @@ private fun EditContent(
             // Shrink the scroll viewport by the keyboard so the focused field
             // scrolls into view above the IME instead of being hidden.
             .imePadding()
-            .verticalScroll(rememberScrollState())
+            .verticalScroll(scroll)
             .padding(start = 24.dp, end = 24.dp, top = 8.dp, bottom = 40.dp),
     ) {
         // Title: borderless headline + accent bar, mirroring the detail screen.
@@ -259,7 +294,9 @@ private fun EditContent(
             onValueChange = viewModel::onTitleChange,
             placeholder = stringResource(R.string.edit_title_hint),
             textStyle = MaterialTheme.typography.headlineMedium.copy(fontWeight = FontWeight.SemiBold),
-            modifier = Modifier.focusRequester(titleFocus),
+            modifier = Modifier
+                .focusRequester(titleFocus)
+                .onPlaced { onTitleBottom(it.positionInParent().y.toInt() + it.size.height) },
         )
         Spacer(Modifier.height(10.dp))
         Box(
@@ -572,6 +609,19 @@ private fun EditContent(
             }
         }
 
+        OptionalFormSection(visible = TaskFormField.Tags in state.visibleFields) {
+            Spacer(Modifier.height(gap))
+            TagsCard(
+                tags = state.tags,
+                draft = state.tagDraft,
+                suggestions = state.tagSuggestions,
+                onDraftChange = viewModel::onTagDraftChange,
+                onCommitDraft = viewModel::commitTagDraft,
+                onAdd = viewModel::addTag,
+                onRemove = viewModel::removeTag,
+            )
+        }
+
         OptionalFormSection(visible = state.hiddenFields.isNotEmpty()) {
             Spacer(Modifier.height(20.dp))
             TextButton(
@@ -727,9 +777,9 @@ private fun EditCard(
         }
     }
     if (onClick != null) {
-        Surface(onClick = onClick, color = color, shape = shape, modifier = Modifier.fillMaxWidth()) { inner() }
+        Surface(onClick = onClick, color = color, shape = shape, modifier = Modifier.fillMaxWidth().revealOnFocus()) { inner() }
     } else {
-        Surface(color = color, shape = shape, modifier = Modifier.fillMaxWidth()) { inner() }
+        Surface(color = color, shape = shape, modifier = Modifier.fillMaxWidth().revealOnFocus()) { inner() }
     }
 }
 
@@ -1040,6 +1090,77 @@ private fun AddReminderCard(position: Position, label: String, onClick: () -> Un
     }
 }
 
+/** The input sits beside the icon; the tags and any suggestions run below it. */
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+private fun TagsCard(
+    tags: List<String>,
+    draft: String,
+    suggestions: List<String>,
+    onDraftChange: (String) -> Unit,
+    onCommitDraft: () -> Unit,
+    onAdd: (String) -> Unit,
+    onRemove: (String) -> Unit,
+) {
+    val query = draft.trim()
+    val matches = if (query.isEmpty()) {
+        emptyList()
+    } else {
+        suggestions.filter { it.contains(query, ignoreCase = true) && it !in tags }.take(MAX_TAG_SUGGESTIONS)
+    }
+    EditCard(
+        icon = Icons.Rounded.Sell,
+        iconContentDescription = stringResource(R.string.edit_tags_label),
+        header = {
+            InlineTextField(
+                value = draft,
+                onValueChange = onDraftChange,
+                placeholder = stringResource(R.string.edit_tags_hint),
+                capitalization = KeyboardCapitalization.None,
+                imeAction = ImeAction.Done,
+                onImeAction = onCommitDraft,
+            )
+        },
+    ) {
+        if (matches.isNotEmpty()) {
+            TagFlow(modifier = Modifier.padding(top = 8.dp)) {
+                matches.forEach { match ->
+                    TagChip(
+                        name = match,
+                        muted = true,
+                        icon = Icons.Rounded.Add,
+                        onClick = { onAdd(match) },
+                    )
+                }
+            }
+        }
+        if (tags.isNotEmpty()) {
+            TagFlow(modifier = Modifier.padding(top = 8.dp)) {
+                tags.forEach { tag ->
+                    TagChip(
+                        name = tag,
+                        icon = Icons.Rounded.Close,
+                        iconContentDescription = stringResource(R.string.edit_tag_remove, tag),
+                        onClick = { onRemove(tag) },
+                    )
+                }
+            }
+        }
+    }
+}
+
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+private fun TagFlow(modifier: Modifier = Modifier, content: @Composable () -> Unit) {
+    FlowRow(
+        modifier = modifier,
+        horizontalArrangement = Arrangement.spacedBy(8.dp),
+        verticalArrangement = Arrangement.spacedBy(8.dp),
+    ) { content() }
+}
+
+private const val MAX_TAG_SUGGESTIONS = 8
+
 /** Picks one hidden optional section to add to the form. */
 @Composable
 private fun FieldPickerDialog(
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditViewModel.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditViewModel.kt
index 304f4ab..fd5add5 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditViewModel.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/edit/TaskEditViewModel.kt
@@ -8,6 +8,7 @@ import de.jeanlucmakiola.agendula.data.reminders.ReminderScheduler
 import de.jeanlucmakiola.agendula.data.tasks.TaskConflictException
 import de.jeanlucmakiola.agendula.data.tasks.TasksRepository
 import de.jeanlucmakiola.agendula.domain.Priority
+import de.jeanlucmakiola.agendula.domain.SmartList
 import de.jeanlucmakiola.agendula.domain.Task
 import de.jeanlucmakiola.agendula.domain.TaskFilter
 import de.jeanlucmakiola.agendula.domain.TaskForm
@@ -17,6 +18,8 @@ import de.jeanlucmakiola.agendula.domain.TaskList
 import de.jeanlucmakiola.agendula.domain.populatedFields
 import de.jeanlucmakiola.agendula.domain.htmlToPlainText
 import de.jeanlucmakiola.agendula.domain.looksLikeHtml
+import de.jeanlucmakiola.agendula.domain.normalizeTags
+import de.jeanlucmakiola.agendula.domain.tagsInUse
 import de.jeanlucmakiola.agendula.domain.rebasedForAllDay
 import de.jeanlucmakiola.agendula.domain.readableDescription
 import de.jeanlucmakiola.agendula.domain.recurrence.RecurringScope
@@ -51,6 +54,11 @@ data class TaskEditUiState(
     val reminders: List<Int> = emptyList(),
     val location: String = "",
     val url: String = "",
+    val tags: List<String> = emptyList(),
+    /** What is typed in the tag field and not added yet. Saving still takes it. */
+    val tagDraft: String = "",
+    /** Every tag already in use, for completing what the user types. */
+    val tagSuggestions: List<String> = emptyList(),
     val rrule: String? = null,
     /** Editing one occurrence of a series: saving asks how far the edit reaches. */
     val isOccurrence: Boolean = false,
@@ -114,7 +122,12 @@ class TaskEditViewModel @Inject constructor(
     private var defaultFields: Set<TaskFormField> = emptySet()
 
     /** Start a fresh task, optionally pre-selecting a list / parent. */
-    fun bindNew(presetListId: Long? = null, parentId: Long? = null, initialTitle: String? = null) {
+    fun bindNew(
+        presetListId: Long? = null,
+        parentId: Long? = null,
+        initialTitle: String? = null,
+        presetTag: String? = null,
+    ) {
         if (bound) return
         bound = true
         editingTaskId = null
@@ -142,6 +155,7 @@ class TaskEditViewModel @Inject constructor(
                     lists = lists,
                     parentCandidates = loadParents(defaultList, selfId = null),
                     title = initialTitle.orEmpty(),
+                    tags = listOfNotNull(presetTag),
                 ),
             ).also { baseline = it.toForm().copy(title = "") }
         }
@@ -179,6 +193,7 @@ class TaskEditViewModel @Inject constructor(
                     reminders = repository.remindersFor(taskId).filter { !it.fromStart }.map { it.minutesBefore },
                     location = task.location.orEmpty(),
                     url = task.url.orEmpty(),
+                    tags = task.tags,
                     rrule = task.recurrenceRule,
                     originalRule = task.recurrenceRule,
                     isOccurrence = task.isOccurrence,
@@ -202,6 +217,18 @@ class TaskEditViewModel @Inject constructor(
         return tasks.filter { !it.isClosed && !it.isSubtask && it.taskId != selfId }
     }
 
+    private var suggestionsRequested = false
+
+    /** Tags on open tasks, read once the user starts typing one rather than on every bind. */
+    private fun loadTagSuggestions() {
+        if (suggestionsRequested) return
+        suggestionsRequested = true
+        viewModelScope.launch {
+            val tasks = runCatching { repository.tasks(TaskFilter.Smart(SmartList.ALL)).first() }.getOrElse { emptyList() }
+            _state.value = _state.value.copy(tagSuggestions = tagsInUse(tasks))
+        }
+    }
+
     /** Reveal an optional section (one tap from the "More fields" picker). */
     fun revealField(field: TaskFormField) = update {
         val visible = it.visibleFields + field
@@ -257,6 +284,18 @@ class TaskEditViewModel @Inject constructor(
     fun removeReminder(minutesBeforeDue: Int) = update { it.copy(reminders = it.reminders - minutesBeforeDue) }
     fun onLocationChange(value: String) = update { it.copy(location = value) }
     fun onUrlChange(value: String) = update { it.copy(url = value) }
+    fun addTag(name: String) = update { it.copy(tags = normalizeTags(it.tags + name), tagDraft = "") }
+
+    /** A typed comma adds what came before it. */
+    fun onTagDraftChange(value: String) {
+        loadTagSuggestions()
+        update {
+            if (',' in value) it.copy(tags = it.withDraft(value), tagDraft = "") else it.copy(tagDraft = value)
+        }
+    }
+
+    fun commitTagDraft() = update { it.copy(tags = it.withDraft(it.tagDraft), tagDraft = "") }
+    fun removeTag(name: String) = update { it.copy(tags = it.tags - name) }
     fun onRecurrenceChange(rrule: String?) = update { it.copy(rrule = rrule, errors = emptySet()) }
 
     /** Dismiss the conflict prompt without saving (the user keeps editing). */
@@ -339,5 +378,8 @@ private fun TaskEditUiState.toForm(): TaskForm = TaskForm(
     reminders = reminders,
     location = location.ifBlank { null },
     url = url.ifBlank { null },
+    tags = withDraft(tagDraft),
     rrule = rrule,
 )
+
+private fun TaskEditUiState.withDraft(draft: String): List<String> = normalizeTags(tags + draft.split(','))
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsScreen.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsScreen.kt
index 92088cb..56e6968 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsScreen.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsScreen.kt
@@ -3,6 +3,7 @@ package de.jeanlucmakiola.agendula.ui.lists
 import de.jeanlucmakiola.floret.components.ReorderableColumn
 import androidx.compose.material.icons.rounded.Check
 import androidx.compose.material.icons.rounded.DragHandle
+import androidx.compose.material.icons.rounded.Sell
 import androidx.compose.material.icons.rounded.SwapVert
 import androidx.activity.compose.BackHandler
 import androidx.compose.animation.AnimatedVisibility
@@ -370,6 +371,31 @@ private fun ListsContent(
                 }
             }
         }
+
+        if (state.tags.isNotEmpty()) {
+            item(key = "tags-header") { SectionHeader(stringResource(R.string.tags_header)) }
+            itemsIndexed(state.tags, key = { _, t -> "tag-${t.tag}" }) { index, overview ->
+                GroupedRow(
+                    title = overview.tag,
+                    position = positionOf(index, state.tags.size),
+                    leading = {
+                        Icon(
+                            Icons.Rounded.Sell,
+                            contentDescription = null,
+                            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                    },
+                    trailing = {
+                        Text(
+                            overview.openCount.toString(),
+                            style = MaterialTheme.typography.labelLarge,
+                            color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        )
+                    },
+                    onClick = { onOpenFilter(TaskFilter.Tagged(overview.tag)) },
+                )
+            }
+        }
     }
 }
 
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsViewModel.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsViewModel.kt
index 1016ee0..918dac5 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsViewModel.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/lists/ListsViewModel.kt
@@ -13,6 +13,7 @@ import de.jeanlucmakiola.agendula.domain.Task
 import de.jeanlucmakiola.agendula.domain.TaskFilter
 import de.jeanlucmakiola.agendula.domain.TaskFiltering
 import de.jeanlucmakiola.agendula.domain.TaskList
+import de.jeanlucmakiola.agendula.domain.tagsInUse
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
@@ -73,6 +74,7 @@ internal fun RemoteLists.Outcome.asFailure(local: ListWriteFailure): ListWriteFa
 data class ListOverview(val list: TaskList, val openCount: Int)
 data class AccountGroup(val accountName: String, val lists: List<ListOverview>)
 data class SmartCount(val smart: SmartList, val count: Int)
+data class TagOverview(val tag: String, val openCount: Int)
 
 sealed interface ListsUiState {
     data object Loading : ListsUiState
@@ -87,6 +89,8 @@ sealed interface ListsUiState {
         val upcoming: List<Task>,
         /** Every task (open and completed) — the corpus the home search filters. */
         val allTasks: List<Task>,
+        /** Each tag on an open task, alphabetically. */
+        val tags: List<TagOverview> = emptyList(),
     ) : ListsUiState
 }
 
@@ -177,13 +181,22 @@ class ListsViewModel @Inject constructor(
                 )
             }
             .sortedBy { it.accountName.lowercase() }
+        // Counts the open rows the tag's own screen shows: a subtask folds under a
+        // parent carrying the same tag, and stands on its own otherwise.
+        val allTasks = openTasks + completedTasks
+        val tags = tagsInUse(openTasks).map { tag ->
+            val tagged = allTasks.filter { tag in it.tags }
+            val ids = tagged.mapTo(HashSet()) { it.taskId }
+            TagOverview(tag, tagged.count { !it.isClosed && (!it.isSubtask || it.parentId !in ids) })
+        }
         return ListsUiState.Content(
             smartCounts = smartCounts,
             groups = groups,
             todayDone = completedDueToday,
             todayTotal = todayTotal,
             upcoming = upcoming,
-            allTasks = openTasks + completedTasks,
+            allTasks = allTasks,
+            tags = tags,
         )
     }
 
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/navigation/AgendulaNavHost.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/navigation/AgendulaNavHost.kt
index a090218..44b54d9 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/navigation/AgendulaNavHost.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/navigation/AgendulaNavHost.kt
@@ -114,6 +114,7 @@ fun AgendulaNavHost(
             val filter = Dest.TaskList.filterOf(
                 smart = args?.getString(Dest.TaskList.ARG_SMART),
                 listId = args?.getLong(Dest.TaskList.ARG_LIST_ID) ?: Dest.NO_ID,
+                tag = args?.getString(Dest.TaskList.ARG_TAG),
             )
             val vm: TaskListViewModel = hiltViewModel()
             LaunchedEffect(filter) { vm.bind(filter) }
@@ -125,7 +126,8 @@ fun AgendulaNavHost(
                     onOpenTask = onOpenTask,
                     onNewTask = {
                         val presetListId = (filter as? TaskFilter.OfList)?.listId
-                        nav.navigate(Dest.TaskEdit.buildNew(presetListId = presetListId))
+                        val tag = (filter as? TaskFilter.Tagged)?.tag
+                        nav.navigate(Dest.TaskEdit.buildNew(presetListId = presetListId, tag = tag))
                     },
                     onBack = { nav.popBackStack() },
                 )
@@ -166,6 +168,7 @@ fun AgendulaNavHost(
             val parentId = args?.getLong(Dest.TaskEdit.ARG_PARENT_ID) ?: Dest.NO_ID
             val occurrence = args?.getLong(Dest.TaskEdit.ARG_OCCURRENCE)?.takeIf { it != Dest.NO_ID }
             val title = args?.getString(Dest.TaskEdit.ARG_TITLE)
+            val tag = args?.getString(Dest.TaskEdit.ARG_TAG)
             val vm: TaskEditViewModel = hiltViewModel()
             LaunchedEffect(taskId, presetListId, parentId) {
                 if (taskId != Dest.NO_ID) {
@@ -175,6 +178,7 @@ fun AgendulaNavHost(
                         presetListId = presetListId.takeIf { it != Dest.NO_ID },
                         parentId = parentId.takeIf { it != Dest.NO_ID },
                         initialTitle = title,
+                        presetTag = tag,
                     )
                 }
             }
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/navigation/Destinations.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/navigation/Destinations.kt
index 87127dd..be6ecf9 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/navigation/Destinations.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/navigation/Destinations.kt
@@ -53,30 +53,35 @@ object Dest {
     }
 
     /**
-     * One [TaskFilter]'s tasks. Carries *either* `listId` (a real list) *or*
-     * `smart` (a [SmartList] name); whichever is set decides the filter.
+     * One [TaskFilter]'s tasks. Carries one of `listId` (a real list), `smart`
+     * (a [SmartList] name) or `tag`; whichever is set decides the filter.
      */
     object TaskList {
         const val ARG_LIST_ID = "listId"
         const val ARG_SMART = "smart"
-        const val route = "taskList?$ARG_LIST_ID={$ARG_LIST_ID}&$ARG_SMART={$ARG_SMART}"
+        const val ARG_TAG = "tag"
+        const val route = "taskList?$ARG_LIST_ID={$ARG_LIST_ID}&$ARG_SMART={$ARG_SMART}&$ARG_TAG={$ARG_TAG}"
 
         val arguments = listOf(
             navArgument(ARG_LIST_ID) { type = NavType.LongType; defaultValue = NO_ID },
             navArgument(ARG_SMART) { type = NavType.StringType; nullable = true; defaultValue = null },
+            navArgument(ARG_TAG) { type = NavType.StringType; nullable = true; defaultValue = null },
         )
 
         fun build(filter: TaskFilter): String = when (filter) {
             is TaskFilter.OfList -> "taskList?$ARG_LIST_ID=${filter.listId}"
             is TaskFilter.Smart -> "taskList?$ARG_SMART=${filter.list.name}"
+            is TaskFilter.Tagged -> "taskList?$ARG_TAG=${android.net.Uri.encode(filter.tag)}"
             // Several lists at once only exists for the widget, which never routes here.
             is TaskFilter.OfLists -> error("OfLists has no task-list screen")
         }
 
         /** Reconstruct the filter from a destination's arguments. */
-        fun filterOf(smart: String?, listId: Long): TaskFilter =
-            if (smart != null) TaskFilter.Smart(SmartList.valueOf(smart))
-            else TaskFilter.OfList(listId)
+        fun filterOf(smart: String?, listId: Long, tag: String? = null): TaskFilter = when {
+            smart != null -> TaskFilter.Smart(SmartList.valueOf(smart))
+            tag != null -> TaskFilter.Tagged(tag)
+            else -> TaskFilter.OfList(listId)
+        }
     }
 
     /** A single task's detail; `occ` (epoch millis) picks one occurrence of a series. */
@@ -105,12 +110,14 @@ object Dest {
         const val ARG_PARENT_ID = "parentId"
         const val ARG_OCCURRENCE = "occ"
         const val ARG_TITLE = "title"
+        const val ARG_TAG = "tag"
         const val route =
             "taskEdit?$ARG_TASK_ID={$ARG_TASK_ID}" +
                 "&$ARG_PRESET_LIST_ID={$ARG_PRESET_LIST_ID}" +
                 "&$ARG_PARENT_ID={$ARG_PARENT_ID}" +
                 "&$ARG_OCCURRENCE={$ARG_OCCURRENCE}" +
-                "&$ARG_TITLE={$ARG_TITLE}"
+                "&$ARG_TITLE={$ARG_TITLE}" +
+                "&$ARG_TAG={$ARG_TAG}"
 
         val arguments = listOf(
             navArgument(ARG_TASK_ID) { type = NavType.LongType; defaultValue = NO_ID },
@@ -118,17 +125,24 @@ object Dest {
             navArgument(ARG_PARENT_ID) { type = NavType.LongType; defaultValue = NO_ID },
             navArgument(ARG_OCCURRENCE) { type = NavType.LongType; defaultValue = NO_ID },
             navArgument(ARG_TITLE) { type = NavType.StringType; nullable = true; defaultValue = null },
+            navArgument(ARG_TAG) { type = NavType.StringType; nullable = true; defaultValue = null },
         )
 
         fun buildEdit(taskId: Long, occurrenceStart: Long? = null): String =
             if (occurrenceStart == null) "taskEdit?$ARG_TASK_ID=$taskId"
             else "taskEdit?$ARG_TASK_ID=$taskId&$ARG_OCCURRENCE=$occurrenceStart"
 
-        fun buildNew(presetListId: Long? = null, parentId: Long? = null, title: String? = null): String {
+        fun buildNew(
+            presetListId: Long? = null,
+            parentId: Long? = null,
+            title: String? = null,
+            tag: String? = null,
+        ): String {
             val params = buildList {
                 if (presetListId != null) add("$ARG_PRESET_LIST_ID=$presetListId")
                 if (parentId != null) add("$ARG_PARENT_ID=$parentId")
                 if (!title.isNullOrBlank()) add("$ARG_TITLE=${android.net.Uri.encode(title)}")
+                if (!tag.isNullOrBlank()) add("$ARG_TAG=${android.net.Uri.encode(tag)}")
             }
             return if (params.isEmpty()) "taskEdit" else "taskEdit?${params.joinToString("&")}"
         }
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListScreen.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListScreen.kt
index d15d6c6..9d2b30c 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListScreen.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListScreen.kt
@@ -30,6 +30,7 @@ import androidx.compose.foundation.layout.windowInsetsPadding
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.imePadding
 import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
@@ -48,6 +49,8 @@ import androidx.compose.material.icons.rounded.Edit
 import androidx.compose.material.icons.rounded.ExpandMore
 import androidx.compose.material.icons.rounded.Flag
 import androidx.compose.material3.Checkbox
+import androidx.compose.material3.Badge
+import androidx.compose.material3.BadgedBox
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.ExtendedFloatingActionButton
 import androidx.compose.material3.Icon
@@ -57,14 +60,19 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.MediumTopAppBar
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Surface
-import androidx.compose.material.icons.automirrored.rounded.Sort
 import androidx.compose.material.icons.rounded.Repeat
+import androidx.compose.material.icons.rounded.Sell
+import androidx.compose.material.icons.rounded.Tune
 import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.SwipeToDismissBox
 import androidx.compose.ui.res.pluralStringResource
 import de.jeanlucmakiola.agendula.domain.TaskSortOrder
+import de.jeanlucmakiola.floret.components.revealOnFocus
 import de.jeanlucmakiola.floret.components.InlineTextField
-import de.jeanlucmakiola.floret.components.OptionPicker
+import de.jeanlucmakiola.floret.components.FullScreenPicker
+import de.jeanlucmakiola.floret.components.GroupedRow
+import de.jeanlucmakiola.floret.components.GroupedSectionHeader
+import de.jeanlucmakiola.floret.components.SelectedCheck
 import androidx.compose.material3.SwipeToDismissBoxValue
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
@@ -189,7 +197,9 @@ fun TaskListScreen(
                 },
                 actions = {
                     IconButton(onClick = { showSort = true }, enabled = content != null) {
-                        Icon(Icons.AutoMirrored.Rounded.Sort, contentDescription = stringResource(R.string.sort_title))
+                        BadgedBox(badge = { if (content?.selectedTags?.isNotEmpty() == true) Badge() }) {
+                            Icon(Icons.Rounded.Tune, contentDescription = stringResource(R.string.view_options_title))
+                        }
                     }
                     if (list != null) {
                         IconButton(
@@ -277,12 +287,13 @@ fun TaskListScreen(
     }
 
     if (showSort && content != null) {
-        OptionPicker(
-            title = stringResource(R.string.sort_title),
-            options = TaskSortOrder.entries,
-            selected = content.sortOrder,
-            label = { stringResource(sortLabel(it)) },
-            onSelect = { viewModel.setSortOrder(it); showSort = false },
+        ViewOptionsPicker(
+            sortOrder = content.sortOrder,
+            tags = content.availableTags,
+            selectedTags = content.selectedTags,
+            onSortOrder = viewModel::setSortOrder,
+            onToggleTag = viewModel::toggleTagFilter,
+            onClearTags = viewModel::clearTagFilter,
             onDismiss = { showSort = false },
         )
     }
@@ -324,7 +335,7 @@ fun TaskListScreen(
     }
 }
 
-@OptIn(ExperimentalMaterial3Api::class, ExperimentalFoundationApi::class)
+@OptIn(ExperimentalMaterial3Api::class, ExperimentalFoundationApi::class, ExperimentalLayoutApi::class)
 @Composable
 private fun TaskListBody(
     state: TaskListUiState.Content,
@@ -349,7 +360,7 @@ private fun TaskListBody(
     val listId = (filter as? TaskFilter.OfList)?.listId
     // In a mixed view (a smart list) the list colour bar + name disambiguate
     // rows; inside a single real list both are redundant.
-    val showListName = filter is TaskFilter.Smart
+    val showListName = filter is TaskFilter.Smart || filter is TaskFilter.Tagged
     // Completed tasks collapse away by default to keep the active list in focus.
     var completedExpanded by rememberSaveable { mutableStateOf(false) }
     // Parents the user expanded to reveal their subtasks inline. Children are
@@ -379,8 +390,16 @@ private fun TaskListBody(
     // When the bottom quick-add bar is shown it already lives in the scaffold's
     // bottomBar (so `inner` covers it); otherwise reserve room to clear the FAB.
     val bottomBarShown = state.bottomAddBar && listId != null
+    // While typing, the viewport ends at the keyboard (or at the quick-add bar
+    // riding on it), so a focused add-subtask row can scroll fully above it.
+    val imeVisible = WindowInsets.isImeVisible
+    val viewport = when {
+        !imeVisible -> Modifier
+        bottomBarShown -> Modifier.padding(bottom = inner.calculateBottomPadding())
+        else -> Modifier.imePadding()
+    }
     LazyColumn(
-        modifier = Modifier.fillMaxSize(),
+        modifier = Modifier.fillMaxSize().then(viewport),
         contentPadding = PaddingValues(
             top = inner.calculateTopPadding() + 8.dp,
             bottom = inner.calculateBottomPadding() + if (bottomBarShown) 16.dp else 96.dp,
@@ -659,7 +678,7 @@ internal fun TaskRowContent(
     val listName = task.listName?.takeIf { showListName && it.isNotBlank() }
     // Everything secondary collapses into one quiet supporting line below the title.
     val hasMeta = task.priority != Priority.NONE || due != null || subtaskTotal > 0 ||
-        listName != null || task.isOccurrence
+        listName != null || task.isOccurrence || task.tags.isNotEmpty()
 
     Surface(
         onClick = onClick,
@@ -714,6 +733,7 @@ internal fun TaskRowContent(
                         subtaskTotal = subtaskTotal,
                         listName = listName,
                         listColor = task.effectiveColor,
+                        tags = task.tags,
                         dark = dark,
                     )
                 }
@@ -745,6 +765,7 @@ private fun TaskMetaLine(
     subtaskTotal: Int,
     listName: String?,
     listColor: Int,
+    tags: List<String>,
     dark: Boolean,
 ) {
     val muted = MaterialTheme.colorScheme.onSurfaceVariant
@@ -800,6 +821,28 @@ private fun TaskMetaLine(
                 }
             }
         }
+        if (tags.isNotEmpty()) {
+            add {
+                Row(
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.spacedBy(3.dp),
+                ) {
+                    Icon(
+                        Icons.Rounded.Sell,
+                        contentDescription = stringResource(R.string.edit_tags_label),
+                        tint = muted,
+                        modifier = Modifier.size(13.dp),
+                    )
+                    Text(
+                        tags.joinToString(", "),
+                        style = style,
+                        color = muted,
+                        maxLines = 1,
+                        overflow = TextOverflow.Ellipsis,
+                    )
+                }
+            }
+        }
         if (listName != null) {
             add {
                 Text(
@@ -852,7 +895,7 @@ private fun AddSubtaskRow(
         shape = cardShape(position, 22.dp, 6.dp),
         // Same tone as the subtask rows it closes, so the group reads as one unit.
         color = MaterialTheme.colorScheme.surfaceContainer,
-        modifier = modifier.fillMaxWidth().padding(horizontal = 16.dp).then(gap),
+        modifier = modifier.fillMaxWidth().padding(horizontal = 16.dp).then(gap).revealOnFocus(),
     ) {
         Row(
             modifier = Modifier.fillMaxWidth().heightIn(min = 52.dp).padding(start = 12.dp, end = 8.dp),
@@ -1169,11 +1212,64 @@ private fun CenteredMessage(text: String, inner: PaddingValues) {
     }
 }
 
+/**
+ * Sort and tag filter in one place. Stays open while choosing, since several
+ * tags can be ticked; back leaves. A task must carry every ticked tag.
+ */
+@Composable
+private fun ViewOptionsPicker(
+    sortOrder: TaskSortOrder,
+    tags: List<String>,
+    selectedTags: Set<String>,
+    onSortOrder: (TaskSortOrder) -> Unit,
+    onToggleTag: (String) -> Unit,
+    onClearTags: () -> Unit,
+    onDismiss: () -> Unit,
+) {
+    FullScreenPicker(
+        title = stringResource(R.string.view_options_title),
+        onDismiss = onDismiss,
+        actions = {
+            if (selectedTags.isNotEmpty()) {
+                TextButton(onClick = onClearTags) { Text(stringResource(R.string.view_filter_clear)) }
+            }
+        },
+    ) {
+        GroupedSectionHeader(stringResource(R.string.sort_title))
+        TaskSortOrder.entries.forEachIndexed { index, order ->
+            val isSelected = order == sortOrder
+            GroupedRow(
+                title = stringResource(sortLabel(order)),
+                position = positionOf(index, TaskSortOrder.entries.size),
+                selected = isSelected,
+                trailing = if (isSelected) ({ SelectedCheck() }) else null,
+                onClick = { onSortOrder(order) },
+            )
+        }
+        if (tags.isNotEmpty()) {
+            Spacer(Modifier.height(8.dp))
+            GroupedSectionHeader(stringResource(R.string.view_filter_tags))
+            tags.forEachIndexed { index, tag ->
+                val isSelected = tag in selectedTags
+                GroupedRow(
+                    title = tag,
+                    position = positionOf(index, tags.size),
+                    selected = isSelected,
+                    leading = { Icon(Icons.Rounded.Sell, contentDescription = null) },
+                    trailing = if (isSelected) ({ SelectedCheck() }) else null,
+                    onClick = { onToggleTag(tag) },
+                )
+            }
+        }
+    }
+}
+
 @Composable
 private fun titleFor(filter: TaskFilter, listName: String?): String = when (filter) {
     is TaskFilter.OfList -> listName ?: stringResource(R.string.tasks_title)
     // Several lists at once only exists for the widget, which never routes here.
     is TaskFilter.OfLists -> error("OfLists has no task-list screen")
+    is TaskFilter.Tagged -> filter.tag
     is TaskFilter.Smart -> stringResource(
         when (filter.list) {
             SmartList.TODAY -> R.string.smart_today
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListViewModel.kt b/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListViewModel.kt
index f8873fd..477efb5 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListViewModel.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/ui/tasklist/TaskListViewModel.kt
@@ -9,6 +9,8 @@ import de.jeanlucmakiola.agendula.data.tasks.TasksRepository
 import de.jeanlucmakiola.agendula.data.tasks.recoveringFromProviderFailure
 import de.jeanlucmakiola.agendula.domain.Task
 import de.jeanlucmakiola.agendula.domain.TaskFilter
+import de.jeanlucmakiola.agendula.domain.TaskFiltering
+import de.jeanlucmakiola.agendula.domain.tagsInUse
 import de.jeanlucmakiola.agendula.domain.TaskForm
 import de.jeanlucmakiola.agendula.domain.TaskList
 import de.jeanlucmakiola.agendula.domain.TaskSortOrder
@@ -55,6 +57,10 @@ sealed interface TaskListUiState {
         val sortOrder: TaskSortOrder = TaskSortOrder.DUE,
         /** This real list is kept out of the smart lists. */
         val hiddenFromSmartLists: Boolean = false,
+        /** Tags the unnarrowed view carries, offered as filter chips. */
+        val availableTags: List<String> = emptyList(),
+        /** The tags [tasks] is narrowed to; a task must carry all of them. */
+        val selectedTags: Set<String> = emptySet(),
     ) : TaskListUiState
 }
 
@@ -83,6 +89,8 @@ class TaskListViewModel @Inject constructor(
 
     private val filter = MutableStateFlow<TaskFilter?>(null)
 
+    private val tagFilter = MutableStateFlow<Set<String>>(emptySet())
+
     /** Occurrences swiped to delete but not yet committed — hidden until the undo lapses. */
     private val pendingDeletes = MutableStateFlow<Map<String, Task>>(emptyMap())
 
@@ -101,7 +109,7 @@ class TaskListViewModel @Inject constructor(
                         combine(tasks, repository.taskLists()) { rows, lists ->
                             TaskListUiState.Content(rows, lists.firstOrNull { it.id == f.listId })
                         }
-                    is TaskFilter.Smart ->
+                    is TaskFilter.Smart, is TaskFilter.Tagged ->
                         tasks.map { TaskListUiState.Content(it) }
                     // Several lists at once only exists for the widget, which never routes here.
                     is TaskFilter.OfLists -> error("OfLists has no task-list screen")
@@ -109,12 +117,20 @@ class TaskListViewModel @Inject constructor(
                 // Drop rows pending an undoable delete so the row vanishes on swipe
                 // while the actual provider delete waits for the snackbar to commit,
                 // and fold in the live UI settings (add-subtask row, bottom add bar).
-                combine(content, pendingDeletes, settingsPrefs.settings) { st, pending, settings ->
+                combine(content, pendingDeletes, settingsPrefs.settings, tagFilter) { st, pending, settings, tags ->
                     if (st is TaskListUiState.Content) {
+                        val visible = settings.visibleIn(f, st.tasks).filter { it.occurrenceKey !in pending }
+                        val available = tagsInUse(visible) - setOfNotNull((f as? TaskFilter.Tagged)?.tag)
+                        // A tag that vanished can no longer be unticked, so it is dropped
+                        // for good rather than narrowing again when it comes back.
+                        val selected = tags.filterTo(LinkedHashSet()) { it in available }
+                        if (selected.size != tags.size) tagFilter.value = selected
                         st.copy(
-                            tasks = settings.visibleIn(f, st.tasks)
-                                .filter { it.occurrenceKey !in pending }
+                            tasks = visible
+                                .filter { TaskFiltering.hasAllTags(it, selected) }
                                 .sortedWith(settings.sortOrder.comparator()),
+                            availableTags = available,
+                            selectedTags = selected,
                             showAddSubtaskRow = settings.showAddSubtaskRow,
                             bottomAddBar = settings.bottomAddBar,
                             sortOrder = settings.sortOrder,
@@ -163,6 +179,12 @@ class TaskListViewModel @Inject constructor(
 
     fun bind(taskFilter: TaskFilter) { filter.value = taskFilter }
 
+    fun toggleTagFilter(tag: String) {
+        tagFilter.value = if (tag in tagFilter.value) tagFilter.value - tag else tagFilter.value + tag
+    }
+
+    fun clearTagFilter() { tagFilter.value = emptySet() }
+
     fun toggleComplete(task: Task) {
         if (task.isCompleted) {
             viewModelScope.launch {
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/widget/TaskWidget.kt b/app/src/main/java/de/jeanlucmakiola/agendula/widget/TaskWidget.kt
index 88a8426..8e10742 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/widget/TaskWidget.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/widget/TaskWidget.kt
@@ -169,6 +169,7 @@ private fun TaskWidgetBody(
     val ready = data as? TaskWidgetData.Ready
     val title = when (filter) {
         is TaskFilter.Smart -> context.getString(smartListLabel(filter.list))
+        is TaskFilter.Tagged -> filter.tag
         is TaskFilter.OfList, is TaskFilter.OfLists -> ready?.singleListName
             ?: context.getString(R.string.widget_tasks_label)
     }
@@ -279,6 +280,7 @@ private fun TaskWidgetHeader(title: String, filter: TaskFilter, singleListId: Lo
         // still opens straight to it, otherwise this just raises the app.
         is TaskFilter.OfLists -> filter.listIds.singleOrNull()?.let { MainActivity.listIntent(context, it) }
             ?: Intent(context, MainActivity::class.java).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+        is TaskFilter.Tagged -> Intent(context, MainActivity::class.java).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
     }
     WidgetHeader(
         title = title,
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/widget/TaskWidgetConfigActivity.kt b/app/src/main/java/de/jeanlucmakiola/agendula/widget/TaskWidgetConfigActivity.kt
index c68cded..ff21de6 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/widget/TaskWidgetConfigActivity.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/widget/TaskWidgetConfigActivity.kt
@@ -221,7 +221,7 @@ private fun WidgetFilterPicker(
             when (selected) {
                 is TaskFilter.OfList -> setOf(selected.listId)
                 is TaskFilter.OfLists -> selected.listIds
-                is TaskFilter.Smart -> emptySet()
+                is TaskFilter.Smart, is TaskFilter.Tagged -> emptySet()
             },
         )
     }
diff --git a/app/src/main/java/de/jeanlucmakiola/agendula/widget/WidgetData.kt b/app/src/main/java/de/jeanlucmakiola/agendula/widget/WidgetData.kt
index 4ee3794..352e5d9 100644
--- a/app/src/main/java/de/jeanlucmakiola/agendula/widget/WidgetData.kt
+++ b/app/src/main/java/de/jeanlucmakiola/agendula/widget/WidgetData.kt
@@ -100,6 +100,7 @@ internal fun TaskFilter.widgetStorageValue(): String = when (this) {
     is TaskFilter.OfList -> "list:$listId"
     is TaskFilter.OfLists -> "lists:${listIds.sorted().joinToString(",")}"
     is TaskFilter.Smart -> "smart:${list.name}"
+    is TaskFilter.Tagged -> error("A tag has no widget")
 }
 
 /** Anything unreadable, or a smart list the widget doesn't offer, falls back to Today. */
@@ -166,7 +167,7 @@ sealed interface TaskWidgetData {
         val singleListId: Long? = when (filter) {
             is TaskFilter.OfList -> filter.listId
             is TaskFilter.OfLists -> filter.listIds.singleOrNull()
-            is TaskFilter.Smart -> null
+            is TaskFilter.Smart, is TaskFilter.Tagged -> null
         }
 
         /** [singleListId]'s name. */
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 99586cf..cca85bc 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -39,6 +39,9 @@
     <string name="lists_reorder_done">Done reordering</string>
     <string name="lists_reorder_handle">Drag to reorder</string>
     <string name="sort_title">Sort by</string>
+    <string name="view_options_title">Sort and filter</string>
+    <string name="view_filter_tags">Filter by tag</string>
+    <string name="view_filter_clear">Clear filter</string>
     <string name="sort_due">Due date</string>
     <string name="sort_priority">Priority</string>
     <string name="sort_title_alpha">Title</string>
@@ -185,6 +188,9 @@
     <string name="edit_location_label">Location</string>
     <string name="edit_url_label">Link</string>
     <string name="edit_url_hint">https://…</string>
+    <string name="edit_tags_label">Tags</string>
+    <string name="edit_tags_hint">Add a tag</string>
+    <string name="edit_tag_remove">Remove tag %1$s</string>
     <string name="edit_discard_title">Discard changes?</string>
     <string name="edit_discard_body">Your changes to this task haven’t been saved.</string>
     <string name="edit_discard_confirm">Discard</string>
@@ -212,6 +218,7 @@
 
     <!-- Lists overview -->
     <string name="lists_header">Lists</string>
+    <string name="tags_header">Tags</string>
     <string name="new_task">New task</string>
     <string name="lists_failure">Could not read your tasks.</string>
     <string name="lists_empty">No task lists yet.</string>
diff --git a/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/TaskWriteMapperTest.kt b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/TaskWriteMapperTest.kt
index 4ec590e..2ede4d0 100644
--- a/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/TaskWriteMapperTest.kt
+++ b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/TaskWriteMapperTest.kt
@@ -148,6 +148,17 @@ class TaskWriteMapperTest {
         assertThat(undone[Tasks.COMPLETED]).isNull()
     }
 
+    @Test
+    fun `category row carries only the name, so the provider resolves the category itself`() {
+        val values = TaskWriteMapper.categoryValues(taskId = 12L, name = "Work")
+
+        assertThat(values).containsExactly(
+            TasksContract.Properties.TASK_ID, 12L,
+            TasksContract.Properties.MIMETYPE, "vnd.android.cursor.item/category",
+            TasksContract.Category.NAME, "Work",
+        )
+    }
+
     @Test
     fun `alarm carries every column the provider's validator demands`() {
         val values = TaskWriteMapper.alarmValues(taskId = 12L, minutesBeforeDue = 30)
diff --git a/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoMapperTest.kt b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoMapperTest.kt
index 9f08ba0..b2e1c5e 100644
--- a/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoMapperTest.kt
+++ b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoMapperTest.kt
@@ -303,6 +303,65 @@ class VTodoMapperTest {
         }
     }
 
+    @Nested
+    inner class Categories {
+
+        @Test
+        fun `a single plain line is claimed into the column`() {
+            val mapped = VTodoMapper.read(vtodo("CATEGORIES:Work,Home\\, Garden"))
+            assertThat(mapped.entity.categories).containsExactly("Work", "Home, Garden").inOrder()
+            assertThat(mapped.entity.unknownProperties.orEmpty()).doesNotContain("CATEGORIES")
+        }
+
+        @Test
+        fun `several lines are read but round-trip from the residue`() {
+            val mapped = VTodoMapper.read(vtodo("CATEGORIES:Work", "CATEGORIES:Errands"))
+            assertThat(mapped.entity.categories).containsExactly("Work", "Errands").inOrder()
+
+            val written = VTodoMapper.write(mapped.entity).properties("CATEGORIES").map { it.value }
+            assertThat(written).containsExactly("Work", "Errands")
+        }
+
+        @Test
+        fun `a line the column would not reproduce exactly stays in the residue`() {
+            val mapped = VTodoMapper.read(vtodo("CATEGORIES;LANGUAGE=de:Arbeit", "SUMMARY:x"))
+            assertThat(mapped.entity.categories).containsExactly("Arbeit")
+            assertThat(VTodoMapper.read(vtodo("CATEGORIES:a, b")).entity.unknownProperties)
+                .contains("CATEGORIES:a, b")
+
+            val written = VTodoMapper.write(mapped.entity).properties("CATEGORIES")
+            assertThat(written.single().param("LANGUAGE")).isEqualTo("de")
+        }
+
+        @Test
+        fun `editing the tags evicts the residue copies and authors one line`() {
+            val mapped = VTodoMapper.read(vtodo("CATEGORIES:Work", "CATEGORIES:Errands"))
+            val edited = mapped.entity.copy(categories = listOf("Work", "Home"))
+
+            val written = VTodoMapper.write(edited).properties("CATEGORIES")
+            assertThat(written.single().value).isEqualTo("Work,Home")
+            assertThat(written.single().params).isEmpty()
+        }
+
+        @Test
+        fun `no tags writes no line`() {
+            assertThat(VTodoMapper.write(entity()).properties("CATEGORIES")).isEmpty()
+        }
+
+        @Test
+        fun `a duplicated or blank tag is dropped and the line stays in the residue`() {
+            val mapped = VTodoMapper.read(vtodo("CATEGORIES:Work, ,Work"))
+            assertThat(mapped.entity.categories).containsExactly("Work")
+            assertThat(VTodoMapper.write(mapped.entity).properties("CATEGORIES").single().value).isEqualTo("Work, ,Work")
+        }
+
+        @Test
+        fun `an unclean column is cleaned on the way out`() {
+            val written = VTodoMapper.write(entity().copy(categories = listOf(" a ", "", "a", "b")))
+            assertThat(written.properties("CATEGORIES").single().value).isEqualTo("a,b")
+        }
+    }
+
     @Nested
     inner class Validation {
 
diff --git a/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoRoundTripTest.kt b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoRoundTripTest.kt
index 48b0895..55e7c6b 100644
--- a/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoRoundTripTest.kt
+++ b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/ical/VTodoRoundTripTest.kt
@@ -39,6 +39,8 @@ class VTodoRoundTripTest {
         "mixed-value-types",
         "malformed-scalars",
         "two-timezones",
+        "categories-shapes",
+        "categories-split",
     )
 
     @TestFactory
diff --git a/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/room/CategoriesLiftTest.kt b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/room/CategoriesLiftTest.kt
new file mode 100644
index 0000000..8fd047d
--- /dev/null
+++ b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/room/CategoriesLiftTest.kt
@@ -0,0 +1,35 @@
+package de.jeanlucmakiola.agendula.data.tasks.room
+
+import com.google.common.truth.Truth.assertThat
+import org.junit.jupiter.api.Test
+
+class CategoriesLiftTest {
+
+    @Test
+    fun `claims a lone plain line and keeps the rest of the residue`() {
+        val result = CategoriesLift.lift("X-FOO:bar\r\nCATEGORIES:Work,Home\r\n")
+        assertThat(result.categories).containsExactly("Work", "Home").inOrder()
+        assertThat(result.claimed).isTrue()
+        assertThat(result.residue).contains("X-FOO:bar")
+        assertThat(result.residue).doesNotContain("CATEGORIES")
+    }
+
+    @Test
+    fun `a residue that was only the line becomes null`() {
+        assertThat(CategoriesLift.lift("CATEGORIES:Work\r\n").residue).isNull()
+    }
+
+    @Test
+    fun `several lines are read but not claimed`() {
+        val residue = "CATEGORIES:a\r\nCATEGORIES:b\r\n"
+        val result = CategoriesLift.lift(residue)
+        assertThat(result.categories).containsExactly("a", "b").inOrder()
+        assertThat(result.claimed).isFalse()
+        assertThat(result.residue).isEqualTo(residue)
+    }
+
+    @Test
+    fun `nothing to lift from an empty residue`() {
+        assertThat(CategoriesLift.lift(null)).isEqualTo(CategoriesLift.Result(emptyList(), null, claimed = false))
+    }
+}
diff --git a/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/room/ConvertersTest.kt b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/room/ConvertersTest.kt
index 2ef8067..3c8272c 100644
--- a/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/room/ConvertersTest.kt
+++ b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/room/ConvertersTest.kt
@@ -50,4 +50,12 @@ class ConvertersTest {
         }
         assertThat(Converters.alarmReferenceFrom("NONSENSE")).isEqualTo(AlarmReference.DUE)
     }
+
+    @Test
+    fun `categories round-trip with escaped commas and come back cleaned`() {
+        val stored = CategoriesConverter.toText(listOf("a,b", " c ", "", "c"))
+        assertThat(stored).isEqualTo("a\\,b,c")
+        assertThat(CategoriesConverter.fromText(stored)).containsExactly("a,b", "c").inOrder()
+        assertThat(CategoriesConverter.fromText("")).isEmpty()
+    }
 }
diff --git a/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/room/TaskFormWriterTest.kt b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/room/TaskFormWriterTest.kt
index 7a1ed8b..b64fb59 100644
--- a/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/room/TaskFormWriterTest.kt
+++ b/app/src/test/java/de/jeanlucmakiola/agendula/data/tasks/room/TaskFormWriterTest.kt
@@ -29,6 +29,7 @@ private fun form(
     start: Instant? = null,
     due: Instant? = null,
     isAllDay: Boolean = false,
+    tags: List<String> = emptyList(),
 ) = TaskForm(
     title = title,
     listId = 1,
@@ -36,6 +37,7 @@ private fun form(
     start = start,
     due = due,
     isAllDay = isAllDay,
+    tags = tags,
 )
 
 class TaskFormWriterTest {
@@ -51,6 +53,12 @@ class TaskFormWriterTest {
         assertThat(entity.isDirty).isTrue()
     }
 
+    @Test
+    fun `tags are trimmed and blanks dropped`() {
+        val entity = TaskFormWriter.apply(task(), form(tags = listOf(" Work ", "", "  ", "Home")), NOW, ZONE)
+        assertThat(entity.categories).containsExactly("Work", "Home").inOrder()
+    }
+
     @Test
     fun `progress and status move together in both directions`() {
         assertThat(TaskFormWriter.apply(task(), form(percentComplete = 100), NOW, ZONE).status)
diff --git a/app/src/test/java/de/jeanlucmakiola/agendula/domain/TaskFilteringTest.kt b/app/src/test/java/de/jeanlucmakiola/agendula/domain/TaskFilteringTest.kt
index 9be0ed7..7749331 100644
--- a/app/src/test/java/de/jeanlucmakiola/agendula/domain/TaskFilteringTest.kt
+++ b/app/src/test/java/de/jeanlucmakiola/agendula/domain/TaskFilteringTest.kt
@@ -58,4 +58,32 @@ class TaskFilteringTest {
         assertThat(TaskFiltering.matches(task, TaskFilter.OfList(7), todayStart, todayEnd)).isTrue()
         assertThat(TaskFiltering.matches(task, TaskFilter.OfList(8), todayStart, todayEnd)).isFalse()
     }
+
+    @Test
+    fun `Tagged matches open and completed tasks carrying the tag`() {
+        val filter = TaskFilter.Tagged("Work")
+        assertThat(TaskFiltering.matches(testTask(tags = listOf("Home", "Work")), filter, todayStart, todayEnd)).isTrue()
+        assertThat(
+            TaskFiltering.matches(testTask(tags = listOf("Work"), status = TaskStatus.COMPLETED), filter, todayStart, todayEnd),
+        ).isTrue()
+        assertThat(TaskFiltering.matches(testTask(tags = listOf("work")), filter, todayStart, todayEnd)).isFalse()
+    }
+
+    @Test
+    fun `narrowing by tags needs every one of them`() {
+        val task = testTask(tags = listOf("Home", "Work"))
+        assertThat(TaskFiltering.hasAllTags(task, emptySet())).isTrue()
+        assertThat(TaskFiltering.hasAllTags(task, setOf("Work"))).isTrue()
+        assertThat(TaskFiltering.hasAllTags(task, setOf("Work", "Home"))).isTrue()
+        assertThat(TaskFiltering.hasAllTags(task, setOf("Work", "Errands"))).isFalse()
+    }
+
+    @Test
+    fun `tags in use are listed once each, alphabetically ignoring case`() {
+        val tasks = listOf(
+            testTask(id = 1, tags = listOf("work", "Home")),
+            testTask(id = 2, tags = listOf("Home", "errands")),
+        )
+        assertThat(tagsInUse(tasks)).containsExactly("errands", "Home", "work").inOrder()
+    }
 }
diff --git a/app/src/test/java/de/jeanlucmakiola/agendula/domain/TaskFormTest.kt b/app/src/test/java/de/jeanlucmakiola/agendula/domain/TaskFormTest.kt
index 3b49e2d..fb42d1f 100644
--- a/app/src/test/java/de/jeanlucmakiola/agendula/domain/TaskFormTest.kt
+++ b/app/src/test/java/de/jeanlucmakiola/agendula/domain/TaskFormTest.kt
@@ -44,4 +44,16 @@ class TaskFormTest {
         assertThat(TaskForm(title = "x", listId = 1, percentComplete = 30, parentId = 9).populatedFields())
             .containsExactly(TaskFormField.Progress, TaskFormField.Parent)
     }
+
+    @Test
+    fun `tags auto-reveal when the task has any`() {
+        assertThat(TaskForm(title = "x", listId = 1, tags = listOf("Work")).populatedFields())
+            .containsExactly(TaskFormField.Tags)
+    }
+
+    @Test
+    fun `tags are normalised to trimmed, non-blank, unique spellings in order`() {
+        assertThat(normalizeTags(listOf(" Work", "", "Home ", "Work", "work")))
+            .containsExactly("Work", "Home", "work").inOrder()
+    }
 }
diff --git a/app/src/test/java/de/jeanlucmakiola/agendula/domain/TestTasks.kt b/app/src/test/java/de/jeanlucmakiola/agendula/domain/TestTasks.kt
index 9ed7d17..ad92ce0 100644
--- a/app/src/test/java/de/jeanlucmakiola/agendula/domain/TestTasks.kt
+++ b/app/src/test/java/de/jeanlucmakiola/agendula/domain/TestTasks.kt
@@ -13,6 +13,7 @@ fun testTask(
     isAllDay: Boolean = false,
     completedAt: Instant? = null,
     parentId: Long? = null,
+    tags: List<String> = emptyList(),
 ): Task = Task(
     taskId = id,
     listId = listId,
@@ -38,4 +39,5 @@ fun testTask(
     distanceFromCurrent = 0,
     created = null,
     lastModified = null,
+    tags = tags,
 )
diff --git a/app/src/test/java/de/jeanlucmakiola/agendula/domain/export/ICalendarWriterTest.kt b/app/src/test/java/de/jeanlucmakiola/agendula/domain/export/ICalendarWriterTest.kt
index 86c6b8c..43bf0ed 100644
--- a/app/src/test/java/de/jeanlucmakiola/agendula/domain/export/ICalendarWriterTest.kt
+++ b/app/src/test/java/de/jeanlucmakiola/agendula/domain/export/ICalendarWriterTest.kt
@@ -35,9 +35,10 @@ class ICalendarWriterTest {
         rrule: String? = null,
         rdate: String? = null,
         parentId: Long? = null,
+        tags: List<String> = emptyList(),
     ) = ExportTask(
         taskId, uid, title, description, location, url, priority, status, percentComplete,
-        start, due, isAllDay, completedAt, created, lastModified, rrule, rdate, parentId,
+        start, due, isAllDay, completedAt, created, lastModified, rrule, rdate, parentId, tags,
     )
 
     private fun write(vararg tasks: ExportTask, name: String = "Groceries"): String =
@@ -59,6 +60,13 @@ class ICalendarWriterTest {
             assertThat(lines).containsAtLeast("VERSION:2.0", "BEGIN:VTODO", "END:VTODO")
         }
 
+        @Test
+        fun `writes the tags as one CATEGORIES line, escaped`() {
+            val lines = linesOf(write(task(tags = listOf("Work", "Home, Garden"))))
+            assertThat(lines).contains("CATEGORIES:Work,Home\\, Garden")
+            assertThat(linesOf(write(task())).none { it.startsWith("CATEGORIES") }).isTrue()
+        }
+
         @Test
         fun `uses CRLF line endings`() {
             // RFC 5545 requires CRLF. Bare LF is the classic way an .ics is rejected
diff --git a/app/src/test/resources/vtodo/README.md b/app/src/test/resources/vtodo/README.md
index ca0516b..cf4ee53 100644
--- a/app/src/test/resources/vtodo/README.md
+++ b/app/src/test/resources/vtodo/README.md
@@ -30,3 +30,5 @@ VTIMEZONE bodies, fold positions, parameter quoting).
 | `malformed-scalars.ics` | `PRIORITY:11`, `PERCENT-COMPLETE:150`, `SEQUENCE:x`, `STATUS:X-DEFERRED`, `CLASS:X-INTERNAL` — values no spec allows. Clamping or defaulting any of them is a silent rewrite of somebody's data |
 | `two-timezones.ics` | `DTSTART` and `DUE` in different zones. One `timezone` column cannot author both |
 | `folded-utf8.ics` | A line folded mid-emoji-adjacent, to prove folding counts octets and splits on character boundaries |
+| `categories-shapes.ics` | One `CATEGORIES` line with an escaped comma inside a value — the one shape the column claims, so it is re-authored and must come out identical |
+| `categories-split.ics` | One line per tag, a `LANGUAGE` parameter and a space after a comma. Read for display, but none of it is ours to rewrite |
diff --git a/app/src/test/resources/vtodo/categories-shapes.ics b/app/src/test/resources/vtodo/categories-shapes.ics
new file mode 100644
index 0000000..43ab4f3
--- /dev/null
+++ b/app/src/test/resources/vtodo/categories-shapes.ics
@@ -0,0 +1,10 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Several Clients//EN
+BEGIN:VTODO
+UID:categories-001
+DTSTAMP:20260901T120000Z
+SUMMARY:One line, an escaped comma
+CATEGORIES:Work,Home\, Garden
+END:VTODO
+END:VCALENDAR
diff --git a/app/src/test/resources/vtodo/categories-split.ics b/app/src/test/resources/vtodo/categories-split.ics
new file mode 100644
index 0000000..ec52464
--- /dev/null
+++ b/app/src/test/resources/vtodo/categories-split.ics
@@ -0,0 +1,12 @@
+BEGIN:VCALENDAR
+VERSION:2.0
+PRODID:-//Several Clients//EN
+BEGIN:VTODO
+UID:categories-002
+DTSTAMP:20260901T120000Z
+SUMMARY:One line per tag, one with a language
+CATEGORIES:Errands
+CATEGORIES;LANGUAGE=de:Einkauf
+CATEGORIES:a, b
+END:VTODO
+END:VCALENDAR
diff --git a/floret-kit b/floret-kit
index cb109c0..0b44d35 160000
--- a/floret-kit
+++ b/floret-kit
@@ -1 +1 @@
-Subproject commit cb109c0e82f4513a7fb31f898de1c22128508bb5
+Subproject commit 0b44d353d2a617a0c0e0b9f8c71948e2e97e37e4
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 263000f..57d8d63 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,6 +1,6 @@
 [versions]
-agp = "9.2.1"
-kotlin = "2.3.21"
+agp = "9.4.1"
+kotlin = "2.4.20"
 ksp = "2.3.11"
 hilt = "2.60.1"
 coreKtx = "1.19.0"
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 1b33c55..5097068 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index b21b69e..1eca32e 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,8 +1,10 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-9.5.1-bin.zip
-distributionSha256Sum=bafc141b619ad6350fd975fc903156dd5c151998cc8b058e8c1044ab5f7b031f
+distributionSha256Sum=bafd5ce9cfaea0fbccfdc8439a1ac42fbd4cd9c89dc9a988228d8a2639a58e6c
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.8.0-bin.zip
 networkTimeout=10000
+retries=0
+retryBackOffMs=500
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index 23d15a9..249efbb 100755
--- a/gradlew
+++ b/gradlew
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 #
-# Copyright © 2015-2021 the original authors.
+# Copyright © 2015 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -20,7 +20,7 @@
 
 ##############################################################################
 #
-#   Gradle start up script for POSIX generated by Gradle.
+#   gradlew start up script for POSIX generated by Gradle.
 #
 #   Important for running:
 #
@@ -29,7 +29,7 @@
 #       bash, then to run this script, type that shell name before the whole
 #       command line, like:
 #
-#           ksh Gradle
+#           ksh gradlew
 #
 #       Busybox and similar reduced shells will NOT work, because this script
 #       requires all of these POSIX shell features:
@@ -57,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/3d91ce3b8caaf77ad09f381f43615b715b53f72c/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -114,7 +114,6 @@ case "$( uname )" in                #(
   NONSTOP* )        nonstop=true ;;
 esac
 
-CLASSPATH="\\\"\\\""
 
 
 # Determine the Java command to use to start the JVM.
@@ -172,7 +171,6 @@ fi
 # For Cygwin or MSYS, switch paths to Windows format before running java
 if "$cygwin" || "$msys" ; then
     APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
-    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
 
     JAVACMD=$( cygpath --unix "$JAVACMD" )
 
@@ -212,7 +210,6 @@ DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
-        -classpath "$CLASSPATH" \
         -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
         "$@"
 
diff --git a/gradlew.bat b/gradlew.bat
index db3a6ac..3185a43 100644
--- a/gradlew.bat
+++ b/gradlew.bat
@@ -19,12 +19,39 @@
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
 @rem
-@rem  Gradle startup script for Windows
+@rem  gradlew startup script for Windows
 @rem
 @rem ##########################################################################
 
-@rem Set local scope for the variables with windows NT shell
-if "%OS%"=="Windows_NT" setlocal
+@rem Set local scope for the variables, and ensure extensions are enabled
+setlocal EnableExtensions
+
+@rem Catch executions from older scripts and ensure they exit cleanly.
+@rem This can be removed once we can be reasonably confident that few people
+@rem will be migrating directly to this new wrapper.
+goto afterSafetyNet
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
+goto exitWithErrorLevel
+:afterSafetyNet
 
 set DIRNAME=%~dp0
 if "%DIRNAME%"=="" set DIRNAME=.
@@ -45,13 +72,14 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo. 1>&2
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
-echo. 1>&2
-echo Please set the JAVA_HOME variable in your environment to match the 1>&2
-echo location of your Java installation. 1>&2
+1>&2 echo.
+1>&2 echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+1>&2 echo.
+1>&2 echo Please set the JAVA_HOME variable in your environment to match the
+1>&2 echo location of your Java installation.
 
-goto fail
+"%COMSPEC%" /c exit 1
+goto exitWithErrorLevel
 
 :findJavaFromJavaHome
 set JAVA_HOME=%JAVA_HOME:"=%
@@ -59,36 +87,26 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo. 1>&2
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
-echo. 1>&2
-echo Please set the JAVA_HOME variable in your environment to match the 1>&2
-echo location of your Java installation. 1>&2
+1>&2 echo.
+1>&2 echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+1>&2 echo.
+1>&2 echo Please set the JAVA_HOME variable in your environment to match the
+1>&2 echo location of your Java installation.
 
-goto fail
+"%COMSPEC%" /c exit 1
+goto exitWithErrorLevel
 
 :execute
 @rem Setup the command line
 
-set CLASSPATH=
 
 
-@rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
+@rem Execute gradlew
+@rem endlocal doesn't take effect until after the line is parsed and variables are expanded
+@rem which allows us to clear the local environment before executing the java command
+endlocal & "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %* & call :exitWithErrorLevel & goto exitWithErrorLevel
 
-:end
-@rem End local scope for the variables with windows NT shell
-if %ERRORLEVEL% equ 0 goto mainEnd
-
-:fail
-rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
-rem the _cmd.exe /c_ return code!
-set EXIT_CODE=%ERRORLEVEL%
-if %EXIT_CODE% equ 0 set EXIT_CODE=1
-if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
-exit /b %EXIT_CODE%
-
-:mainEnd
-if "%OS%"=="Windows_NT" endlocal
-
-:omega
+@rem This label must not be changed. We rely on old scripts being able to jump to this point.
+:exitWithErrorLevel
+@rem Use "%COMSPEC%" /c exit to allow operators to work properly in scripts
+"%COMSPEC%" /c exit %ERRORLEVEL%
diff --git a/scripts/make_import_fixture.py b/scripts/make_import_fixture.py
index 3c87a44..a2118b3 100644
--- a/scripts/make_import_fixture.py
+++ b/scripts/make_import_fixture.py
@@ -115,8 +115,8 @@ def seed(db: sqlite3.Connection) -> None:
             # data0 minutes before, data1 reference (1 = DUE), data3 alarm type.
             (1, 1, ALARM_MIMETYPE, "30", "1", None, "1"),
             (2, 9, ALARM_MIMETYPE, "1440", "1", "Ship it", "1"),
-            # A non-alarm property the import must skip.
-            (3, 1, "vnd.android.cursor.item/category", "Errands", None, None, None),
+            # A category: data0 the provider's category id, data1 the name. A tag, not an alarm.
+            (3, 1, "vnd.android.cursor.item/category", "1", "Errands", None, None),
         ],
     )