Ambient noise and sound mixer for sleep, focus, and relaxation.
No ads. No tracking. No internet required.
SleepyTone mixes procedural noise generators with ambient sound loops through a single audio pipeline, giving you glitch-free layering with per-source volume control.
25 sounds to mix:
| Noise Generators | Ambient Loops |
|---|---|
| White, Pink, Brown | Rain, Window Rain, Thunder |
| Green, Blue, Violet | Ocean, Creek, Fire |
| Crickets, Toads, Whale (x2) | |
| Fan, AC, Airplane | |
| Cat Purring, Purring 2 | |
| 5 Hz Brainwave, LF Hum (x2) | |
| Melody |
All noise is generated on-device. Ambient loops are decoded once and cached for instant playback on subsequent launches.
- Sound mixing -- combine any number of sources with individual volume sliders
- Sleep timer -- set up to 8 hours, countdown visible in the header
- Background playback -- runs as a foreground service, keeps playing when you leave the app
- Dark UI -- designed for bedtime use
- Offline -- everything runs locally, no network calls
- Tiny footprint -- under 10 MB APK, minimal battery drain
Download the latest APK from Releases and sideload it. Android 8.0+ (API 26) required.
git clone https://github.com/Liddo-kun/chromatone.git
cd chromatone
./gradlew assembleReleaseThe signed APK is output to the project root as chromatone-release.apk.
- No analytics, no tracking, no network code
- No data leaves your device
- Only requires audio, notification, and backup permissions
- Open source -- review the code anytime
MIT License. See LICENSE for details.