Brown Noise Player
Brown noise, free, right here
Press play for smooth, deep brown noise that is generated live in your browser — no recording, so it never loops. For sleep, study, focus or a noisy office.
Tap play — or press the space bar
Balanced, steady brown noise
What is brown noise?
Brown noise is random sound with most of its energy in the low frequencies: its power drops by 6 dB every octave. The result is a deep, even rumble with no hiss, like a distant waterfall or steady rain on a roof. It takes its name from Brownian motion, not the colour. More on how it works →
For sleep
How to use it at night, how loud, and what the research does and doesn’t show.
Study timer
Brown noise in 25-minute focus rounds with a soft bell. Free, in your browser.
For study & focus
Why people with ADHD talk about it, and what the studies on noise and attention found.
Brown vs white vs pink
The noise colours side by side, and how to pick one.
How this player works
- Generated, not recorded. White noise is integrated into a random walk and filtered, tens of thousands of times a second for each ear, using the same signal processing as the iPhone app.
- Five sounds, level-matched. Classic, Deep, Warm, Ocean, Rainfall — switching glides between them without a click or a jump in loudness.
- A sleep timer that fades. The last minute fades out gently instead of cutting off.
- Nothing to accept. No ads, no account, no cookies, no analytics. Your sound and volume are remembered on this device only.
Frequently asked questions
What is brown noise?
Brown noise is random sound whose energy falls by 6 decibels with every octave, so it is concentrated in the low frequencies. It sounds like a deep, steady rumble — closer to a distant waterfall or heavy rain on a roof than to TV static. It is also called red or Brownian noise.
Is this brown noise really free?
Yes. The player on this page is free, has no ads, needs no account and sets no cookies. The sound is generated in your browser, so nothing is streamed or downloaded either.
Does this brown noise loop?
No. There is no recording to loop. Every sample is calculated live from random numbers, the same way the Brown Noise Player iPhone app does it, so the sound never repeats and has no seam to notice at 3 a.m.
Can I leave brown noise playing all night?
In this browser tab, yes — keep the tab open and the device awake. Phones usually pause web audio when the screen locks, which is why the iPhone app exists: it keeps playing with the screen off. Keep the volume low for long sessions.
How loud should brown noise be?
Only as loud as it takes to cover the sounds bothering you — for most rooms that is about the level of a quiet conversation or below. For sleep, set it lower than feels necessary while you are awake and put the speaker across the room rather than by your head.
What is the difference between the five sounds?
Classic: balanced, steady brown noise. Deep: darker and heavier, like distant thunder. Warm: softer top end, gentle and close. Ocean: slow rolling swells, like surf. Rainfall: brighter and airier, a steady downpour. All five are level-matched, so switching between them does not change the loudness.
Is brown noise better than white noise?
Neither is better in general. Brown noise has more bass and no hiss, which many people find easier to listen to for hours. White noise has more high-frequency energy, which covers sharp, high sounds more effectively. See brown vs white vs pink noise.