What is the difference between white, pink and brown noise?

White noise has equal energy at every frequency (an even hiss). Pink noise reduces higher frequencies for a softer, balanced sound like steady rain. Brown noise drops the highs further for a deep, rumbling tone like a waterfall.

Is an audio file downloaded to play the noise?

No. The sound is synthesised in real time in your browser with the Web Audio API, so nothing is downloaded and nothing is uploaded.

Can it play continuously?

Yes. The noise loops seamlessly for as long as the tab is open and the device is awake.

White Noise Generator

Play white, pink or brown noise — synthesised locally for focus or sleep.

White, pink and brown noise — generated locally

Mask distractions, focus, or wind down to white, pink, or brown noise — all synthesised in real time in your browser. Adjust the volume on the fly and the sound loops seamlessly for as long as you need.

There is no audio file to download and nothing is ever sent to a server — the whole generator runs in the page.