Sleep Sounds: White Noise

01/Overview

Sleep Sounds is built around a mixer rather than a playlist. Brown, pink and white noise sit alongside nature recordings like heavy rain, forest birds and ocean waves, and each layer carries its own volume control, so the mix can be tuned to the room rather than picked from a fixed list.

02/The problem

A sleep app is judged on what happens after the screen goes off. Playback has to survive backgrounding and Android's battery restrictions, the timer has to end the session without jolting the user awake, and controls have to be reachable without unlocking the phone.

03/The solution

Built a Flutter app around a layered audio engine that mixes multiple looping tracks with independent volume, a foreground service that keeps playback alive screen-off, and a home screen widget that drives the session without opening the app.

04/The result

Shipped a free, ad-supported Android app on Google Play that works fully offline, doubling as a focus and meditation timer alongside its sleep use case.

05/Key features

• 0120+ royalty-free ambient sounds and noise profiles (brown, pink, white).
• 02Custom mixer layering multiple sounds with individual volume control.
• 03Sleep timer with a gradual fade-out instead of an abrupt stop.
• 04Saved mixes — name, store and reload your own soundscapes.
• 05Background playback that keeps running with the screen off.
• 06Home screen widget for control without opening the app.
• 07Streak tracker for building consistent sleep habits.

06/Tech stack

• Flutter
• Dart
• Android
• Google Play

07/Screens