Calendula

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 - Zero telemetry, zero analytics, no internet permission — your data never leaves the device

License

MIT