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.
Released · Android 10+v2.14.0
Calendula
A Material 3 Expressive calendar for Android. Reads, writes, and reminds on top of the system calendar — any CalDAV account just appears — with zero network access of its own.
Features
Calendar views
Month, week, and day views with a one-tap switcher. Full event detail — attendees and responses, reminders, humanized recurrence, availability, visibility, and foreign time zones.
Safe editing
Scoped writes for recurring events (only this, this-and-following, or the whole series), a recurrence picker for presets and custom rules, and conflict-safe saves that ask before overwriting.
Built-in 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.
Private by default
Zero telemetry, zero analytics, no internet permission — your data never leaves the device. Dynamic color on Android 12+, German and English UI.