Brown noise, instantly
Press play for a deep, steady rumble that never repeats a pattern or cuts out. This brown noise is generated live in your browser, so there is nothing to download, no adverts and no account. Set a timer and it fades out gently on its own.
Want it on your phone all night, or offline? Chill Machine makes long, loopable noise tracks on Spotify, designed to play seamlessly on repeat.
What is brown noise?
Brown noise (sometimes called Brownian or red noise) is random sound in which the energy drops steeply as the pitch rises, by about 6 decibels for every octave. In practice that means most of what you hear is low-frequency: it sounds like a distant waterfall, heavy rain on a roof, wind, or the rumble inside a plane cabin. White noise spreads its energy evenly and sounds bright and hissy. Pink noise sits in between. Brown noise is the deepest and softest of the three, which is why many people who find white noise harsh prefer it.
The name has nothing to do with the colour. It comes from Brownian motion, the random jiggling of particles first described by the botanist Robert Brown. The maths used to generate this sound is the same "random walk" idea.
How people use it
People play brown noise to cover up distracting sounds such as traffic, neighbours, snoring or office chatter, to create a consistent backdrop for sleep, and to help them settle into reading, studying or deep work. Everyone is different: try it at a low volume for a few nights or work sessions and see whether it suits you.
Tips for the best experience
- Keep the volume low: you should still be able to hold a conversation over it.
- Speakers usually sound more natural than earbuds for low rumbles, and they are kinder to your ears overnight.
- On Spotify, turn on Crossfade (Settings, then Playback) and Repeat so the loops play seamlessly all night.
Prefer something lighter? Try pink noise or white noise, or explore the full catalogue at Chill Machine.