White noise for sleep
Pick a noise color, set the volume and the sleep timer: the sound is generated right in your browser and switches itself off once you've drifted off.
White, pink, or brown: what's the difference?
White noise spreads equal energy across every frequency: it's the "hissiest" of the three, like TV static, and it's great at masking sudden sounds such as slamming doors or voices. Pink noise softens the high frequencies and sounds smoother, like steady rain: many people find it more pleasant for sleeping. Brown noise leans even harder into the low end and feels like the distant rumble of a waterfall or ocean surf: it's the deepest and the least fatiguing for long listening sessions.
It's worth giving each one a few minutes: the right choice is simply the one your ear "stops noticing" first. This tool is for relaxation only — if you have persistent sleep problems, it is not a substitute for advice from a doctor.
How to use the sleep timer
Set the timer to 15, 30, or 60 minutes before you start the noise: when time is up, the sound stops on its own, so it doesn't play all night or drain your battery for nothing. Most people fall asleep within 10-20 minutes, which makes the 30-minute timer a good starting point. Keep the volume low — just enough to cover background sounds: the noise should be a gentle blanket, not the main event.