# Brown Noise Player

> A free brown noise player that runs in the browser, and the companion site for the Brown Noise Player iPhone app. The sound is generated live from random numbers, not played from a recording, so it never loops.

Key facts:
- Brown noise (also red or Brownian noise) is random sound whose power falls 6 dB per octave (power proportional to 1/f^2), giving a deep rumble with no hiss. It is named after Robert Brown and Brownian motion, not the colour.
- White noise is flat; pink noise falls 3 dB per octave; brown noise falls 6 dB per octave.
- Research on continuous noise as a sleep aid is limited and of low quality (Riedy et al., Sleep Medicine Reviews, 2021). Studies of noise and attention mostly used white or pink noise; a 2024 meta-analysis (Nigg et al., JAACAP) found a small benefit for young people with ADHD. Brown noise itself is barely studied.
- The web player at https://brownnoiseplayer.com/ is free, has no ads, account or cookies, and offers 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). It has a volume control and a sleep timer that fades out.
- A free brown noise study timer at https://brownnoiseplayer.com/study/ runs Pomodoro rounds (25 minutes focus, 5 minutes break, four rounds) with a bell between rounds; breaks dim the noise instead of stopping it.
- Brown Noise Player for iPhone: $0.99 on the App Store. https://apps.apple.com/us/app/brown-noise-player/id6794880428

## Pages

- [Free brown noise, live in your browser](https://brownnoiseplayer.com/): Play free brown noise online. Generated live in your browser, so it never loops. Five sounds, a sleep timer, no ads, no sign-up — for sleep, study and focus.
- [Brown noise study timer](https://brownnoiseplayer.com/study/): A free study timer with brown noise: 25-minute focus rounds, 5-minute breaks and a soft bell, right in your browser. No sign-up, no ads, never loops.
- [What is brown noise?](https://brownnoiseplayer.com/what-is-brown-noise/): Brown noise is random sound whose power falls 6 dB per octave: a deep rumble with no hiss. What it sounds like, where the name comes from, how it is made.
- [Brown noise vs white noise vs pink noise](https://brownnoiseplayer.com/brown-vs-white-vs-pink-noise/): White noise is flat, pink falls 3 dB per octave, brown falls 6 dB per octave. How each sounds, what each masks best, and how to choose one for sleep or focus.
- [Brown noise for sleep](https://brownnoiseplayer.com/brown-noise-for-sleep/): How to use brown noise for sleep: volume, speaker placement, timers vs all night, babies, and an honest look at what research on noise and sleep has found.
- [Brown noise for focus, studying and ADHD](https://brownnoiseplayer.com/brown-noise-for-focus/): Can brown noise help you focus or study, and why do people with ADHD like it? What studies on noise and attention found, and how to use it for deep work.
- [Brown noise vs lo-fi music for studying](https://brownnoiseplayer.com/brown-noise-vs-lofi-for-studying/): Brown noise or lo-fi for studying? Why steady sound distracts less than music for reading and memorising, when lo-fi works better, and what research shows.
- [Brown Noise Player for iPhone](https://brownnoiseplayer.com/app/): Brown noise made live on your iPhone, so it never loops: five sounds, a fading sleep timer, focus sessions, widgets. No ads or tracking. $0.99.