Brown Noise for Sleep & Focus

Brown noise, generated live on your phone. No downloads, no audio files, no loop that starts to sound familiar after the third night — the sound is calculated as it plays, so it never repeats.

Six ready-made mixes to start from — Deep Sleep, Rainfall, Ocean, Focus, Fan and Distant Storm — each one tap away. The rain and the waves are synthesised too, not recordings, so they never repeat and no two swells are the same length.

Or build your own. Five colours: brown, deep brown, pink, white and grey. Stack up to four, set each one's volume, and shape each with its own low-pass and high-pass filter. A Motion control adds the slow swell that turns steady noise into weather, and a stereo width control moves a layer from dead centre to fully spread without changing how loud it is. Save any mix as a preset.

The sleep timer fades down to silence over a length you choose, on a curve that flattens out at both ends so there is no moment where you notice the level start to move. There is also an optional wake alarm that runs the same generator in reverse, rising from silence over as long as ten minutes. Lock screen controls, headphone-unplug pause, and it gets out of the way properly when a call or an alarm needs the audio.

Free covers two layers, three saved presets and timers up to an hour. A single one-time purchase unlocks four layers, unlimited presets, timers of any length and playback with no session limit — no subscription. The app has no account and no server: your presets and settings never leave the device, and you can export or delete all of them from Settings whenever you want.

No ads, ever.

Not a medical device. Does not diagnose, treat, cure or prevent any condition. Brown Noise is for relaxation and background sound, and it does not track or measure your sleep.