Clockula

A Material 3 Expressive clock app for Android.
Alarms, timers, stopwatch and world clock. No account and no network access.

 

Clockula is the clock sibling to Calendula (calendar) and Agendula (tasks). The name follows theirs: clock with Calendula's -ula ending. A Calendula flower head is botanically a cluster of many small florets, so the three apps are florets of one bloom. They share one library, floret-kit.

1.0.0 is in its last betas before the stable release.

Features

Alarms

• Repeat schedules, snooze, your own ringtones and per-alarm settings
• Scheduled as real alarm clocks: exempt from Doze, and shown on the lock screen and in the status bar
• Re-resolved against your current time zone whenever it changes, so DST and travel don't shift them
• A self-check screen that reads your device's actual settings. If one of them would stop an alarm ringing, Clockula names it and opens that settings page, instead of failing quietly at 7am.

Timers, stopwatch and world clock

• Several timers at once, controllable from the notification shade
• A stopwatch with laps
• World clocks from the IANA time-zone database built into Android, so the city list doesn't go stale
• A running timer or stopwatch stays reachable from every tab

Widgets

• Three home-screen widgets: next alarm, timer and clock
• Each widget picks its own theme, or takes its colours from your wallpaper

Works with other apps

• Clockula implements Android's standard AlarmClock intents in full. Your voice assistant and automation apps can set alarms and timers in it the same way they would in the stock clock.
• Alarms, timers, world clocks and settings export to a JSON file whose format is documented in docs/BACKUP.md, and import back from it.

Design and privacy

• Material 3 Expressive throughout, with dynamic colour on Android 12+, light and dark themes, and expressive motion and shapes
• A per-app language setting. Clockula ships in English for now; help translate.
• No telemetry, no analytics and no internet permission

Where your data lives

Calendula works on top of Android's CalendarContract, and Agendula can work on top of the dmfs TaskContract. Both put an interface on a standard someone else maintains. Clocks have no such provider, so Clockula keeps alarms, timers and laps in its own database, the first app in the family to do so. The first section of docs/PLAN.md explains how it makes up for the missing standard: the AlarmClock intents, IANA time zones and the documented backup format listed above.

Install

Channel	Available	Notes
Codeberg release / Obtainium	Now, as betas	Plain APK download, or automatic with Obtainium
Self-hosted F-Droid repo	From 1.0.0	Add the repo once
Build from source	Now	Full control

Codeberg release / Obtainium

Every release is on Codeberg with the signed APK and a .sha256 checksum. Betas are published as pre-releases. Download the APK and install it directly.

For automatic updates, use Obtainium. On your phone, add Clockula in one tap, or add it by hand: Add App, paste https://codeberg.org/jlmakiola/clockula, then Add. While Clockula is in beta, switch on Include prereleases for it, or Obtainium won't find anything. A beta updates in place to later betas and to the stable release.

Self-hosted F-Droid repo

From the stable 1.0.0 on, every release is also published to the self-hosted F-Droid repository that serves Calendula and Agendula. If you already have it, Clockula will show up there. Otherwise add it once:

1. 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=C2C0640402BF458FC0ED957AF0B37AA4C14022E72F89CE90B5965B458CF73425
   

   _{Repo: 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}

2. Refresh, search for Clockula and install it.

Build from source

git clone --recurse-submodules https://codeberg.org/jlmakiola/clockula.git
cd clockula
./gradlew assembleDebug

floret-kit is a submodule built from source as a Gradle composite build, so --recurse-submodules is required. The included build has to find the Android SDK on its own: either export ANDROID_HOME, or put a sdk.dir=… line in a (gitignored) floret-kit/local.properties. CONTRIBUTING.md covers tests and lint.

_{The F-Droid repo and the Codeberg releases share the same signing key, so you can switch between them without reinstalling.}

Documentation

• Contributing: the workflow, the build and the architectural rule changes are reviewed against
• Plan: the spec and the reasoning behind it
• Roadmap: what has shipped and what's next
• Architecture: how the code is put together
• Backup format: the JSON export schema
• Releasing: the release runbook
• Privacy policy: the source of the page at jeanlucmakiola.de/clockula/privacy

Contributing

Bug reports, ideas and patches are welcome on Codeberg. Translations go through Weblate, not pull requests. Read CONTRIBUTING.md before writing code.

Translations

Clockula is written in English. Translations are managed on a self-hosted Weblate, and partial ones are fine: untranslated strings fall back to English.

Help translate Clockula

You don't need to code. Register on the Weblate server, pick a language (or request one) and translate in your browser.

Privacy

Clockula has no analytics, tracking, ads, crash-reporting SDK or third-party services. It doesn't have the internet permission, so it can't send anything anywhere. Your alarms, timers and world clocks stay in the app's private storage on your device.

Privacy policy, written in docs/PRIVACY.md, which is what that page renders.

Licence

MIT, Jean-Luc Makiola, 2026