Every session you finish drops a marble in the jar. Watch it fill up.
© 2026 Rudresh Rajvansh. Licensed under AGPL-3.0.
A focus timer that doesn't nag you, doesn't upsell you, and doesn't phone home.
Most productivity apps I tried wanted a subscription before they'd let me change a colour. FocusJar is the opposite: everything in it is free, there is no account, and nothing you do in the app is tracked, logged, or sent anywhere.
The jar is the whole idea. Finish a 25-minute session, earn a marble. The jar fills over the week. It's a small thing, but watching it fill turns out to be a much better motivator than a number on a dashboard.
| Home | Timer | The Jar |
|---|---|---|
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| Analytics | History | Settings |
|---|---|---|
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- Focus timer that keeps running with the screen off, the app backgrounded, or the phone in your pocket
- Marble jar — one marble per completed session, stacked with a bit of physics so it looks like an actual jar
- Streaks that survive time-zone changes and reset honestly when you miss a day
- Analytics — weekly charts, heatmaps, and totals. Free, like everything else
- 6 colour themes and 5 launcher icons
- Home screen widget showing today's marbles and your current streak
- Local backup — export your sessions and settings to a JSON file you pick, import it back any time. No cloud, no account
- Daily reminders if you want them, silence if you don't
- Light, dark, and AMOLED-black, following the system theme by default
No analytics. No crash reporting. No advertising ID. No account. Nothing about how you use the app is ever collected or transmitted.
The app does hold INTERNET, for exactly one reason: the Privacy Policy and Terms screens load those two documents from my website so they stay current without shipping an app update. Nothing else in FocusJar touches the network, and no data is sent — it's a plain GET for two static HTML pages. If you open those screens offline, a bundled copy is shown instead.
Here is every permission in the shipped APK:
| Permission | Why |
|---|---|
FOREGROUND_SERVICE + ..._SPECIAL_USE |
Keeps the countdown alive when you leave the app |
POST_NOTIFICATIONS |
Tells you the session ended |
VIBRATE |
Buzzes when the session ends |
INTERNET |
Loads the Privacy Policy and Terms pages, nothing else |
WAKE_LOCK |
Pulled in by WorkManager, which runs the daily reminder |
RECEIVE_BOOT_COMPLETED |
Also WorkManager — it reschedules the reminder after a reboot |
ACCESS_NETWORK_STATE |
Also WorkManager, for network-constrained jobs FocusJar doesn't use |
The last two come from the WorkManager library rather than from app code.
Your sessions live in a Room database on your device and go nowhere else. Uninstalling deletes them.
Grab an APK from Releases.
Builds are signed with my key, so if you switch between a build you made yourself and a release APK you'll need to uninstall first — Android refuses to replace an app with one signed differently.
You need JDK 17 and an Android SDK with API 36.
git clone https://github.com/RudreshRajvansh/focusjar.gitcd focusjar && ./gradlew assembleDebugThe APK lands in app/build/outputs/apk/debug/.
Release builds are signed from a keystore.properties in the project root — copy keystore.properties.template and fill in your own keystore. Without that file the release build still compiles, it just comes out unsigned.
Nothing proprietary. Every dependency here is free software, which is what makes the F-Droid build possible.
| Kotlin | Language |
| Jetpack Compose + Material 3 | Entire UI, no XML layouts |
| Hilt | Dependency injection |
| Room | Session history |
| DataStore | Settings |
| WorkManager | Runs the daily reminder |
| Glance | Home screen widget |
| kotlinx.serialization | Backup files |
| Timber | Logging |
Architecture is plain MVVM: a screen and a ViewModel per feature under presentation/, repository interfaces in data/repository/ with the implementations bound in di/RepositoryModule.kt. The timer itself lives in a foreground service and publishes its state as a StateFlow that the ViewModel collects.
Yes please — bug reports especially. See CONTRIBUTING.md for how to get set up and what I'll and won't merge.
© 2026 Rudresh Rajvansh. GNU Affero General Public License v3.0.
Do what you like with it: use it, change it, share it. If you distribute a modified version, it has to stay free too, you have to ship the source, and the copyright notices stay intact. The same goes if you run a modified version as a network service.