Brown Noise
Emerging evidence ↗Deep, low-frequency brown noise generated live in your browser — the warm rumble many people find steadier than white noise. Sleep timer included.
Ready — generated live, no loops
Sleep timer
This sound is synthesized in your browser in real time — there's no file to download, no loop point to notice, and it keeps working with no internet once the page is loaded.
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White Noise
Clean, generated white noise with a sleep timer and volume fade. No loops, no ads in the audio, works offline — free in your browser.
Pink Noise
Balanced pink noise generated in your browser — softer highs than white noise, studied for sleep quality. Free, with a fade-out sleep timer.
Sleep Debt Calculator
Add up your last week of sleep and see your sleep debt in hours, what it does to you, and a realistic recovery plan. Free, instant, private.