iPhone · iOS 17 or later · free · on the App Store since 5 November 2026
A sound made to cover the noise beside you.
Blanket makes white noise on the phone. It does not play a file. The microphone measures your surroundings for four seconds, and the sound is reshaped to cover them at the lowest level that works. Nothing is recorded. Nothing leaves the phone.
Made on the phone. The sound is calculated while it plays. There is no recording and no loop.
Measured, not guessed. Eight numbers describe how loud your surroundings are, from 63 Hz to 8 kHz. The sound sits just above them in each band.
Nothing kept, nothing sent. The audio is discarded after the measurement. No account, no ads, no tracking.
Who it is for
People who sleep, work or travel beside noise they cannot turn off.
- Light sleepers beside a snorer
Snoring is loudest in the low bands. Blanket measures where the snoring is and covers those bands. It leaves the quiet bands alone, so the sound is not louder than it needs to be.
- Parents
A hallway, a television in the next apartment, a street below the window. The sound is made for those surroundings, and the stop time ends it at the time you select.
- Travellers
Hotel corridors, aircraft cabins and unknown neighbours. Each place is measured again when you press Play, so the sound fits the place you are in.
- Offices and shared desks
Keyboards, calls and the air conditioning. With headphones the sound covers them at a level that lets you hear a person who speaks to you.
How a night goes
Press Play. For four seconds the microphone measures your surroundings. The sound starts low and rises while it measures. Then the screen says Covering.
Leave Adapt on. The app listens again for five seconds each minute. When snoring starts an hour later, the sound rises to cover it. When the surroundings become quiet, the sound falls again.
Set the limits once. In Settings you select how far the sound can rise above your level: 3, 6 or 9 dB. The sound never goes above that limit.
Read one line in the morning. "Played 7h 55m", and how often the sound reached the limit. The line is correct even after the app stopped unexpectedly.
With Adapt off, the microphone is never opened. A tone dial in Settings then runs from Rumble to Hiss, with Rush between them. Brown, pink and white noise are three positions on it.
What it does not do
No account. No subscription. No ads. No tracking. No list of sounds to download, no sleep stories, no record of your sleep.
The microphone is a measuring instrument. It listens for a few seconds, keeps eight numbers, and discards the rest. The eight numbers are sound levels. They do not contain speech, and no audio can be rebuilt from them. The only thing the app can send is a daily count of what is used, and only if you turn that on. The privacy policy lists every number.
Read more
Three pages explain the method, with the measurements behind it.
- How Adapt works
How Blanket measures your surroundings and reshapes its sound, step by step.
- Why a steady sound helps
Why a steady sound helps you sleep through noise, and how to measure whether it works.
- Band levels explained
How a change in one frequency band changes the overall level of a sound, with worked numbers.
- Support
Answers to common questions, and how to report a problem: [email protected].