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A deep, steady rumble with no ads and no loop you can hear. Set a sleep timer and it fades out on its own, or switch to a black screen and leave it running.
Brown noise
No timer
Space plays or pauses. B toggles the black screen.
1
Keep it quiet
Turn it up only until it covers the sounds that bother you, and keep the phone across the room rather than on your pillow.
2
Set a timer
If you only need help falling asleep, pick 30 or 45 minutes. On most devices the sound fades out over the last 30 seconds instead of cutting off.
3
Go dark
Tap Black screen so the page gives off no light and stays open. Tap anywhere to bring the controls back.
They're all random noise. What changes is how the energy is spread between low and high pitches.
| Colour | Sounds like | Energy | Try it if |
|---|---|---|---|
| Brown noise | A deep rumble, like a distant waterfall or a strong wind | Most of it in the low end, falling 6 dB per octave | White noise sounds harsh to you, or you want something to fade into the background |
| Pink noise | A softer hiss, like steady rain | Falls 3 dB per octave, so each octave carries equal energy | You want a middle ground that still covers voices |
| White noise | A bright, even hiss, like TV static or a fan | Spread evenly across every frequency | You mainly need to cover voices or a TV through the wall |
Yes. There are no ads, no account and nothing to install. NSDR.co is free to use, and there will always be a free plan.
There are very few controlled studies of brown noise itself. Most sleep research uses white or pink noise, and the results are mixed. Many people find a steady sound helps them fall asleep because it covers sudden noises that would otherwise wake them. Our brown noise for sleep guide goes through what the evidence does and doesn't show.
Only as loud as it needs to be to cover the sounds that bother you. Keep it quieter than normal conversation and put the phone or speaker across the room rather than next to your head. If you only need help falling asleep, set the sleep timer so it doesn't play all night.
It plays through your browser like any other audio, so on most phones it keeps going with the screen locked and shows play and pause on the lock screen. If your phone stops it, turn on the black screen instead: it keeps the screen on but dark, so the page stays open.
The noise is generated in your browser, and the end of each 30-second stretch blends into the start, so there's no noticeable gap. The noise isn't streamed, so it doesn't buffer. Soundscapes like rain are streamed recordings.
It covers the page in pure black and keeps the screen from locking, so the sound keeps playing while your screen gives off as little light as possible. Tap anywhere to bring back play, pause and exit. On a laptop, press B to toggle it and Esc to leave.
NSDR is a guided body scan you do lying down. It's a good way to settle before sleep or to recover from a short night.
Try a sleep session