White, pink & brown noise for focus and sleep

Frequently asked questions

What's the difference between white, pink, and brown noise?

They differ in how energy is spread across frequencies. White noise is flat and bright, like TV static. Pink noise rolls off the highs for a softer, more balanced sound many people find better for focus and sleep. Brown noise rolls off even more, leaving a deep, rumbly wash — the calmest of the three.

Is the noise a looping recording?

No — it's generated live in your browser with the Web Audio API, so there's no short loop to notice repeating and nothing to download. The rain, ocean, and fan presets are the same noise shaped with filters.

Can I use it to sleep or to block out distractions?

Yes. Steady noise masks sudden sounds — traffic, chatter, a snoring partner — which helps some people focus or fall asleep. Use the sleep timer to fade it out automatically after 15, 30, or 60 minutes.

Why do I need to press play first?

Browsers only allow sound to start after you interact with the page, so the noise begins when you tap a preset. That's a browser rule, not a limitation of the tool.

Is it free and private?

Completely. It runs entirely in your browser with no sign-up, no account, and nothing uploaded.