Jean-Luc Makiola
8e2109d073
Follow-up to #97, on the same release line. After the visibility fix a calendar can be absent from the pickers for three different reasons the app knows and never said; this closes that gap. **Settings → Calendars names the state** (#76, #78): read-only calendars are marked `Read-only`; ones whose account isn't syncing events to this device are marked `Not synced`, sorted to the bottom of their account, dimmed, and left **without a switch** — visibility can't reveal events that aren't on the device, so the control did nothing. **Both pickers end in a "Missing a calendar?" row** (#76) opening the calendar manager, where those labels then say which reason applies. The manager overlay moved to the end of the host's overlay stack so it covers every surface that can open it (Settings, both event forms, the import picker). Review notes: - **Supporting text, not chips.** A row can carry several states at once next to a live switch; M3 supporting text composes there, static badges don't (and a non-interactive chip reads as a broken button). - **`sync_events = 0` counts as "not synced" for account-backed calendars only.** Nothing syncs a device-local calendar by definition, and another app's local calendar can hold real events at 0 — the unsoundness that made the first #75 migration guard wrong. Covered by a test. - **Excluded calendars stay out of the pickers** rather than being listed unpickable — a handful of read-only subscriptions would crowd out the ones you can actually choose. 541 JVM tests green (6 new), lint clean, check_translations clean. **On-device review owed**; the three new string keys need the Weblate backfill. Reviewed-on: #101
Calendula
A modern Material 3 Expressive calendar for Android.
Reads, writes, and reminds — on top of the system calendar, with zero network access.
Calendula is named after the flower whose name — like the word calendar —
comes from the Latin kalendae, the first day of the month. It lives
entirely on top of Android's CalendarContract: any calendar synced to your
device (CalDAV via DAVx5, Google, local, WebCal subscriptions, …) simply
appears, and everything you create or edit syncs back the same way. No own
database, no sync stack reinvented.
✨ Features
Calendar
- Month, week, and day views with a one-tap view switcher
- Full event details — attendees and their responses, reminders, recurrence (humanized), availability, visibility, foreign time zones
- Per-calendar visibility toggle, grouped by account
Editing
- Create, edit, and delete events — including recurring events with scoped writes: only this event, this and all following, or the whole series
- Recurrence picker with one-tap presets and custom rules (interval, weekday toggles, end conditions); rules it can't express are preserved verbatim
- Conflict-safe saves: if an event changed elsewhere while you were editing, Calendula asks instead of silently overwriting
- Read-only calendars (WebCal, birthdays) are detected and respected
Reminders
- Event reminders delivered by Calendula itself as notifications — essential when it's your only calendar app, since Android delegates reminder delivery to calendar apps
- Tap a reminder to land on the event
Design & privacy
- Real Material 3 Expressive throughout — dynamic color (Android 12+), expressive motion and shapes, light/dark theme
- German and English UI, per-app language setting — and open to community translations
- Zero telemetry, zero analytics, no internet permission — your data never leaves the device
📦 Install
F-Droid (recommended)
Calendula is on the official F-Droid repository — just search for Calendula in any F-Droid client, or install it from f-droid.org.
Self-hosted repo (latest builds)
New versions are built, signed, and published to a self-hosted repository the moment each tag lands — usually a few days ahead of the official repo, which rebuilds on F-Droid's own schedule. Add it for the freshest builds:
-
In your F-Droid client, open Settings → Repositories → Add (or open the link below on your phone):
https://apps.dev.jeanlucmakiola.de/dev/fdroid/repo?fingerprint=C2C0640402BF458FC0ED957AF0B37AA4C14022E72F89CE90B5965B458CF73425Repo:
https://apps.dev.jeanlucmakiola.de/dev/fdroid/repo· fingerprint (SHA-256):C2C0 6404 02BF 458F C0ED 957A F0B3 7AA4 C140 22E7 2F89 CE90 B596 5B45 8CF7 3425 -
Refresh, search for Calendula, install.
Both channels share the same signing key, so you can switch between them without reinstalling. Or build from source — see below.
📚 Documentation
- Building from source — requirements and Gradle tasks
- Architecture — the layered design and key pipelines
- Roadmap — what's shipped and what's next
🌍 Translations
Calendula ships in German and English, and you're warmly invited to add your language. Translations are managed on a self-hosted Weblate:
No coding needed — register on the Weblate server, pick (or request) a language, and translate the strings in your browser. You can also reach this link in the app from the top of Settings → App language.
📜 License
MIT — Jean-Luc Makiola, 2026