Noise Generator
Continuous background noise for focus, sleep, or masking sound. It keeps playing until you stop it, even with your phone locked, with play and pause in your notifications. Switch colours any time.
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On iPhone and iPad, use the volume buttons on the side.
How to play white, pink or brown noise
- Choose a noise colour: white, pink, brown, blue or violet.
- Set the volume and, if you like, a sleep timer.
- Click Play. It keeps going until you stop it, even with your phone locked, and you can pause it from the notification or lock screen.
About the different noise colours
White noise has equal energy at every frequency — it sounds like TV static or a hiss, and is good at masking sudden, varied sounds. Pink noise reduces higher frequencies (power falls off at 3 dB per octave), sounding softer and closer to steady rain or wind. Brown noise (technically "red noise") falls off even faster (6 dB per octave), producing a deep, low rumble like a waterfall or distant thunder — often preferred for sleep since it has less high-frequency hiss. Blue noise is pink noise's mirror image, rising 3 dB per octave for a brighter, airier hiss; violet noise (also called purple noise) rises even faster at 6 dB per octave for a sharp, almost sizzling hiss — sometimes used to mask high-pitched tinnitus.
The noise is made in your browser from random numbers: a minute of each colour, played like any other audio by two players taking turns, each fading in as the other fades out, so there's never a gap or a seam. That's what lets it keep going with the screen locked or another app open, and gives you play and pause in Android's media notification and on the iPhone lock screen, where next and previous switch between colours. It fades in and out over half a second to avoid a click (on iPhone and iPad, where pages can't set the volume, use the side buttons). The sleep timer only counts while it's playing, fades it out when time's up, and can be changed at any point. Your colour, volume and timer are remembered on this device. Nothing is recorded or uploaded.
One-tap start: install this page as an app (in Chrome's menu, Add to home screen or Install app), then long-press its icon for White, Pink and Brown noise shortcuts. On Android you can drag a shortcut onto your home screen to start that noise with one tap.
Questions about noise colours
What is the difference between white, pink and brown noise?
White noise is an even hiss, like static. Pink noise is softer, like steady rain. Brown noise is a deep rumble, like a waterfall.
Which noise is best for sleep?
Many people prefer pink or brown noise because they have less high-pitched hiss. Try each at a low volume.
Does white noise help with focus?
Many people find it masks distracting sounds like conversation or traffic, which can make concentrating easier.
Will it keep playing if I lock my phone?
Yes. It plays as media, so it keeps going with the screen locked until you stop it or the sleep timer ends, and you can pause it from the notification or lock screen.
Can I add it to my home screen?
Yes. Install it as an app from your browser's menu, then long-press the icon for one-tap White, Pink and Brown noise shortcuts.