A minimal, privacy-respecting sleep timer for Android. Starts a countdown that stops media playback, fades audio out, and optionally locks the screen when it ends — so you can fall asleep without your phone draining the battery or blaring podcasts at 3 AM.
No accounts, no ads, no trackers, no network access.
- Simple countdown timer with
+step,−stepand cancel actions directly from the notification (step is configurable, defaults to 5 min) - Shows the exact wall-clock time at which the timer will end
- Stops audio and video playback across apps at the end of the timer
- Configurable fade-out duration before playback stops
- Optional screen lock when the timer ends — choose between Device Admin (standard Android lock, credential required to unlock) or Shizuku soft lock (simulates the power button, biometric unlock keeps working)
- Optional Wi-Fi and Bluetooth off when the timer ends (both via Shizuku, since modern Android blocks apps from toggling these directly)
- Six built-in themes (Midnight, Ocean, Ember, Light, Basic, AMOLED) with an optional drifting starfield behind the dial
- Haptic feedback for timer controls (can be disabled)
- Foreground service keeps the timer reliable even when the app is in the background
- English and German translations
| Timer running | Settings | Themes |
|---|---|---|
 |
 |
 |
| Permission | Why it is needed |
|---|---|
FOREGROUND_SERVICE + FOREGROUND_SERVICE_MEDIA_PLAYBACK |
Keeps the countdown running reliably in the background so it fires on time |
POST_NOTIFICATIONS |
Shows the running timer with quick actions (+/− step, cancel) |
BIND_DEVICE_ADMIN (optional, force-lock only) |
Required by Android to lock the screen when the timer ends — only requested if you pick the Device Admin lock method |
The app declares a ShizukuProvider so it can talk to
Shizuku when you enable the Wi-Fi off,
Bluetooth off, or soft-lock features. Shizuku is optional — the core
timer works without it, and the provider is dormant until you opt in.
The app does not request the INTERNET permission. It cannot connect to any
network.
- No analytics, crash reporting, or telemetry
- No third-party SDKs (no Firebase, no Google Play Services, no ads)
- All settings are stored locally on your device using Jetpack DataStore
- No data leaves your device
Submission pending.
Signed APKs are published on the Releases page.
Requirements:
- JDK 17
- Android SDK with platform 35 (
compileSdk) minSdkis 26 (Android 8.0)
./gradlew assembleReleaseThe build is fully reproducible from this repository using a 100% FLOSS toolchain — no proprietary dependencies, no binary blobs.
app/— Android application module, entry points, DI wiringcore/data/— settings and timer state (DataStore + repository pattern)core/service/— foreground service managing the countdown and playback controlfeature/timer/— Jetpack Compose UI for the timer and settings screens
Written in Kotlin with Jetpack Compose, Hilt (DI) and kotlinx.serialization.
Issues and pull requests are welcome at https://github.com/Xitee1/sleep-timer.
SleepTimer is free software licensed under the GNU General Public License, version 3 or later. See LICENSE for the full text.
Copyright (C) 2026 Xitee
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.