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Static stylized '1' on a slate (0xFF5C6B7A) background. The numeral references kalendae, the Latin word for 'first day of the month' that is the etymological root of both 'Calendar' and 'Calendula'. Adaptive icon spec: foreground vector path, monochrome variant for themed icons (API 33+), no PNG fallback needed (minSdk 29 > 26). Visual refinement is expected during the UI design iteration; this is the foundational shape and meaning. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Calendula
A modern Material 3 Expressive calendar app for Android.
Calendula is named after the flower of the same name, whose name comes from
the Latin kalendae — the first day of the month — the same root as the
word "calendar". Calendula reads from Android's built-in CalendarContract,
so any calendar source synced to your device (CalDAV via DAVx5, Google,
local, WebCal subscriptions, ...) is shown.
Features (V1)
- Month, Week, and Day views
- Read-only event details (write support comes in V2)
- Multi-calendar visibility toggle
- Material You Dynamic Color (Android 12+)
- Light/Dark theme follows system
- German + English UI
Building
Requires Android SDK 36 and JDK 17. The Gradle wrapper is checked in, so no host Gradle install is needed:
# Build debug APK
./gradlew assembleDebug
# Run unit tests
./gradlew test
# Run lint
./gradlew lint
If your default JDK is something other than 17, set JAVA_HOME explicitly:
JAVA_HOME=/path/to/jdk-17 ./gradlew assembleDebug
License
MIT — Jean-Luc Makiola, 2026