Brown Noise: A Deep, Soft Rumble for Sleep and Focus
A deep, soft rumble made in your browser, with no whispering or triggers. It can play all night as a quiet backdrop for sleep, focus or ASMR.
Free, no sign-up. Plays track after track all night, with a sleep timer.
Brown Noise
Made in your browser, not a recording.
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ChillHow to use brown noise
- Start quiet
- Turn it up only until it covers what's distracting you. Brown noise is so low that it doesn't sound harsh even when it's loud, which makes it easy to creep louder than you need.
- Cover low rumbles
- Footsteps upstairs, a humming air conditioner, distant traffic: brown noise usually covers deep sounds like these better than white noise.
- For sleep
- Set the timer for 30 to 60 minutes to fade it out, or choose No limit to let it play all night.
- Focus in public
- In a cafe or open office, play it quietly through headphones and nearby conversations fade into the background.
- Small speakers struggle
- Most of brown noise is low frequency, which phone and laptop speakers can barely reproduce, so it may sound very quiet. Headphones or an external speaker make it much clearer.
What is brown noise?
Brown noise puts most of its energy in the low end: its energy per hertz drops 6 dB with each octave up, twice as steep as pink noise. It sounds like distant thunder, a big waterfall or the rumble inside an airplane cabin.
The name isn't about the color. It comes from Brownian motion. You'll also hear it called red noise. It's made by adding up a running stream of random numbers, so the sound slowly drifts and turns deep.
The sound on this page is calculated in your browser rather than played from a recording, so the sound itself uses no data. We layer three loops of different lengths, so the combined sound takes about three and a half hours to repeat exactly.
What research says
Noise and sleep: a 2021 review of 38 studies on continuous sound for sleep rated the evidence as very low quality, so it isn't clear whether it helps.
Volume: a 2014 study measured 14 infant sleep machines at full volume, and all of them were louder than 50 dBA at 30 cm. Keep the volume low and the speaker away from your bed.
This page isn't medical advice. Noise doesn't treat any condition.
Sources checked Nov 10, 2026.
Need it for a video?
The noise on this page only plays in the browser and can't be downloaded. For deep, quiet background music you can download, the sleep station is the closest match, and every track there downloads as a full MP3.
Brown noise questions
What's the difference between brown, white and pink noise?
White noise has equal energy at every frequency and sounds like a hiss. Pink noise drops 3 dB per octave and sounds softer. Brown noise drops 6 dB per octave and sounds like a low rumble.
Is brown noise the same as red noise?
Yes. Brown noise is sometimes called red noise, and both names describe the same sound.
Does brown noise help you focus?
Some people find it easier to settle in, especially somewhere noisy. There's little research on brown noise itself, so try it and turn it off if it bothers you.
Can I play it all night?
Yes, as long as the page stays open. Set the sleep timer if you want it to fade out and stop.