White Noise
Moderate evidence ↗Clean, generated white noise with a sleep timer and volume fade. No loops, no ads in the audio, works offline — free in your browser.
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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Brown Noise
Deep, low-frequency brown noise generated live in your browser — the warm rumble many people find steadier than white noise. Sleep timer included.
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 Cycle Calculator
Sleep cycle calculator: enter your wake-up time and get the best bedtimes based on 90-minute sleep cycles plus time to fall asleep. Free and instant.