About Brown Noise for Sleep

A free brown noise player, an editorial guide, and an Android app — made by one small developer, ItDeveApps.

What this site is

Brown Noise for Sleep is two things. The first is a free player that generates brown noise directly in your browser — you press play and sound starts, with no account, no install, and no download. The second is a set of plain-English explainers about the noise colours themselves: what brown noise actually is, how it differs from white and pink noise, and what the research does and does not support when people use it for sleep, focus, or tinnitus.

The site exists because most "brown noise" pages are either a ten-minute audio file on a loop with an ad wrapped around it, or an article that never lets you hear the thing it is describing. We wanted one page where the explanation and the sound sit side by side, and where the sound is spectrally correct rather than whatever a stock audio library happened to label "brown".

The site is published by ItDeveApps, the same developer that publishes the Brown Noise, Sleep Sounds: BRW Android app. The website and the app share the same sound design and the same person answering the email.

Who publishes it

ItDeveApps is the publisher of record. You can see everything it has released on its Google Play developer page. The site and the app are written and maintained by Omar Altamimi.

To be explicit about what we are not: nobody here is a physician, an audiologist, or a sleep scientist. We build audio software. Where this site touches health, it reports what published research says and points you to a qualified professional — it never substitutes for one. See how we handle health topics below.

How the sound is made

Brown noise has a precise definition: its power spectral density falls at 6 decibels per octave as frequency rises, which is why it sounds like a deep waterfall rather than the bright hiss of white noise. Most free players ignore that definition entirely and serve a compressed audio file that only roughly approximates it.

This site does not play a recording. The noise is generated procedurally in your browser using the Web Audio API. A small AudioWorklet runs on the audio thread and shapes a stream of white noise through a one-pole low-pass filter with its corner at 12 Hz — which is exactly a −6 dB/octave slope everywhere above that corner — followed by a 6 Hz high-pass that removes sub-audible energy which would otherwise eat headroom and rattle phone speakers. Measured across the audible band, the result comes out at −5.98 dB per octave: within two hundredths of a decibel of the textbook definition.

The practical consequence matters more than the number. Because the sound is generated continuously rather than played back, there is no loop point at all. Nothing repeats, so there is no seam to notice at 3 a.m. and no periodic artefact for your brain to lock onto over an eight-hour night. It also means the page ships a few kilobytes of code instead of megabytes of audio, so it starts instantly and costs nothing on a metered connection.

On the rare browser without AudioWorklet support, the player falls back to a pre-rendered buffer that is generated by the same filters and made mathematically periodic, so even the fallback has no audible seam.

The Android app

The web player is deliberately limited to a 30-minute session, because streaming audio indefinitely to every visitor is not something a free site can sustain. The Android app is where the unlimited version lives: offline playback, sleep timers, background play, sound mixing, and brown, white, pink, blue and green noise.

The app's public track record, as shown on its Google Play listing:

• Brown Noise, Sleep Sounds: BRW (com.itdeveapps.brownnoise)
• Released 4 April 2025; version 4.5.1, last updated 28 May 2026
• 4.46 out of 5 stars from 443 ratings, across more than 20,000 installs
• Category: Health & Fitness. Content rating: Everyone
• Free to download, no advertising. Optional in-app purchases range from $2.99 to $29.99

Why there are no ads

An app people fall asleep to is the worst possible place for an interstitial. The app carries no advertising at all and is funded entirely by optional in-app purchases, which is also why this website carries no ad scripts, no trackers, and no analytics — see the privacy policy for exactly what that means.

How we handle health topics

People arrive here searching for help with insomnia, tinnitus, and attention problems. That makes a large part of this site health-adjacent content, and we try to hold it to a standard that matches.

Our rules: describe what published research actually measured rather than what a headline claimed about it; say plainly when evidence is thin, preliminary, or mostly anecdotal; give concrete safety guidance where it exists, such as volume limits for infants; and never imply that sound is a treatment for a diagnosed condition. Brown noise is not a diagnosis, a treatment, or a cure for insomnia, tinnitus, ADHD, or any hearing or sleep disorder.

If you spot something on this site that is wrong, out of date, or overstated, tell us and we will fix it. That is not a formality — corrections go to the same inbox as everything else, and getting a health claim wrong is the failure we care most about avoiding.

How the site is built

The site is a set of static HTML files generated from plain content files and served from Cloudflare's edge network. There is no database, no user accounts, no login, and no server-side code processing anything you do. That is a deliberate choice as much about privacy as about speed: a site that stores nothing cannot leak anything.

It also means the site does not run Google Analytics or any other analytics or advertising script. The only thing stored in your browser is a single cookie that counts how long the player has been running, so the 30-minute session limit works. The privacy policy covers this in detail, and keeps the website's data practices strictly separate from the Android app's.

Get in touch

Questions, corrections, bug reports, and app support all go to support@brownnoiseforsleep.com. The support page explains what to include and how long a reply usually takes.

Frequently Asked Questions

Related pages

• Brown Noise for Sleep — The free web player, plus the full guide to brown noise for sleep, focus, and tinnitus.
• Brown Noise — The deepest colour, measured at −5.98 dB per octave — best for traffic rumble and long overnight sessions.
• Brown Noise App — Which brown noise app to install, whether it is really free, and the five things an installed app does that a browser tab is not allowed to.
• Sound Masking — Masking does not block sound. It raises the floor so the sound stops standing out — and the colour has to match the intrusion.
• Brown Noise Generator — A real brown noise generator in the browser: built live at a measured -5.98 dB per octave, with no file and no loop point.
• Brown Noise for Tinnitus — Masking versus habituation, why the pitch of your tinnitus decides the colour, and where sound therapy actually sits in the 2014 clinical guideline.