White Noise
White, pink and brown noise with a sleep timer โ synthesised, seamless.
About this noise machine
Three colours of noise โ white's bright hiss, pink's balance, brown's deep rumble โ synthesised on your device and looped seamlessly, so it runs all night without a stream to buffer or an ad break to wake you. A sleep timer stops it after 15, 30 or 60 minutes, and your colour and volume are remembered on this device. Free, no account.
White, pink or brown?
The colours describe how energy spreads across frequencies. White is equal energy everywhere โ bright, hissy, the classic masker. Pink tilts toward lower frequencies (energy falls 3 dB per octave), which most ears read as more natural, like steady rain. Brown tilts harder still โ a deep rumble like surf or a distant engine, and the most popular for sleep because it masks thumps and voices without any high-frequency edge. Evidence on noise and sleep is genuinely mixed โ it reliably masks disruptive sounds rather than sedating you โ so it helps most where the problem is noise, not wakefulness. Keep volume moderate for all-night use; it's still sound exposure, particularly for babies' rooms (and keep the source across the room, not in the cot).
Frequently asked questions
What's the difference between white, pink and brown noise?
How energy spreads across frequencies: white is equal everywhere (bright hiss), pink tilts gently toward bass (rain-like), brown tilts hard (deep rumble). Brown is the usual favourite for sleep; it masks voices and thumps without hiss.
Does white noise actually help you sleep?
The honest evidence: it reliably masks disruptive sounds โ traffic, neighbours, a partner's alarm โ rather than sedating you. If noise is what wakes you, it helps; if not, it's just sound.
Will it keep playing with the screen off?
In a foreground tab it plays indefinitely โ the loop is generated, not streamed. Phone browsers may pause audio when locked; the sleep timer covers the falling-asleep window either way.
Is it safe to play all night?
At moderate volume, yes โ but it is still sound exposure. For babies, keep the volume low and the device across the room, not next to the cot.