03287ae25d
### Part A — the title shortens instead of wrapping `CalendarTitleButton` measures the full title against the width the bar hands the title slot (`BoxWithConstraints` + `rememberTextMeasurer`) and falls back to a shorter form when it does not fit. One pass, so no flicker, and it adapts on its own to locale, font scale and to the pill being absent after #150. - Month and week fall back to the three-letter month ("Sep", "Mär"). - Day drops the weekday instead ("Wed, 2 Sep 2027" → "2 Sep 2027") — there is no shorter month form left there, `EEEdMMM` is already abbreviated. - Either way the title now clamps to one line and ellipsises rather than growing the bar to two lines. The choice itself is a pure `titleFor(title, shortTitle, titleWidth, availableWidth)`, so it is unit-tested rather than only reachable through a composable. `formatCalendarTitle` gained no new behaviour, so the widget header is untouched. ### Part B — the trailing edge, not the whole rhythm `AppBarSpacing` holds the shared values: the side inset (also consumed by the month grid, so the pill lines up with the content under it), the title's start inset, and the two trailing insets — one measured to a container's background, one to an icon button's glyph. **Deviation from the issue:** the issue asks for one edge inset at *both* ends and one gap between adjacent controls. Only the trailing edge and the title inset are shared here. M3 derives both the title's position and the gap between two adjacent action icons from the icon buttons' width, so putting the leading edge and the inter-icon gaps on the same rhythm meant narrowing the icon buttons from 48.dp to 32.dp — that reads cramped and shrinks the touch targets. The leading edge and the icon gaps stay on M3's defaults. The title's 8.dp start inset stays real padding rather than a negative offset, so the menu button's hit box is intact. The agenda range bar picks its end inset from whether the view switcher is showing: aligned to the pill's background when it is, to the search icon's glyph once #150 hides it. Closes #165 Co-authored-by: Jean-Luc Makiola <business@jeanlucmakiola.de> Reviewed-on: https://codeberg.org/jlmakiola/calendula/pulls/261
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
- English and German UI plus community translations (Spanish, French, Italian, Polish, and more in progress), per-app language setting — and open to more languages
- Zero telemetry, zero analytics, no internet permission — your data never leaves the device
📦 Install
Pick whichever channel you already use — they all install the same app:
| Channel | Updates | Notes |
|---|---|---|
| Official F-Droid | On F-Droid's build schedule | Recommended; no extra setup |
| Self-hosted F-Droid repo | Minutes after a release | Fastest; needs the repo added once |
| Codeberg release / Obtainium | Per release | Plain APK download, or automated by Obtainium |
| Google Play | — | Coming soon |
| Build from source | Whenever you build | Full control |
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.
F-Droid rebuilds from source on its own schedule, so a new version usually shows up there a few days after release.
Self-hosted F-Droid repo (fastest updates)
Every release is built, signed, and published to a self-hosted F-Droid repository as part of the release pipeline, so it lands there first. Add it once and your F-Droid client handles updates from then on:
-
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.
Codeberg release / Obtainium
If you'd rather not use F-Droid at all, every release is also published on
Codeberg with the
signed APK (calendula_vX.Y.Z.apk) and a .sha256 checksum attached — download
and install it directly.
For automatic updates from that channel, use
Obtainium — on the phone,
add Calendula in one tap,
or do it by hand: Add App → paste https://codeberg.org/jlmakiola/calendula
→ Add. Either way, Obtainium tracks the releases and prompts you when a new
one appears.
Google Play (coming soon)
Calendula is on its way to Google Play as an additional channel. It isn't live yet — this section gets a link once it is. Play builds will be signed with Google's key rather than mine, so switching between Play and any other channel will require an uninstall.
Testers wanted. Play requires a round of closed testing before the app can go public, and I'm still looking for testers. If you'd like to help, email business@jeanlucmakiola.de with the Google account address you want to use — that address is what I need to add you to the closed test.
Build from source
The build is a plain Gradle build with no proprietary dependencies — see
docs/BUILDING.md (note the floret-kit submodule).
Official F-Droid, the self-hosted repo, and the Codeberg releases all share the same signing key, so you can switch freely between them without reinstalling.
📚 Documentation
- Contributing — how to report, propose, and patch
- Building from source — requirements and Gradle tasks
- Architecture — the layered design and key pipelines
- Milestones — what's shipped and what's next
🤝 Contributing
Bug reports, ideas, and patches are all welcome on Codeberg.
The short version: start with an issue. Features get a yes-or-no before they
get code, and both features and bugs are assigned a milestone whose
release/vX.Y.Z branch your pull request then targets. Typo and docs fixes can
skip straight to a pull request. Translations don't go through pull requests at
all — Weblate owns them.
Read CONTRIBUTING.md before writing code: it covers the
workflow, the build (note the floret-kit submodule), and the architectural
rules a change is reviewed against.
🌍 Translations
Calendula ships in English and German, with community translations in Arabic, Chinese, French, Italian, Polish, Portuguese, Russian, and Spanish at varying degrees of completeness — partial is fine, untranslated strings simply fall back to English. You're warmly invited to add or finish 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