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Free brown noise that plays as long as you like, with a sleep timer and a black screen. No ads, no sign-up.
Brown noise
No timer
Space plays or pauses. B toggles the black screen.
Noise plays in the background while you do something else. NSDR (non-sleep deep rest) is guided rest. You lie still with your eyes closed, stay awake, and follow a voice that moves your attention through your body and slows your breathing.
Brown noise is a deep, steady rumble, like a waterfall or heavy rain. Its power falls about 6 dB with each octave you go up, so the low end dominates. The name has nothing to do with the colour. It comes from Brownian motion, the random movement of particles in water, named after the botanist Robert Brown.
Long or repeated exposure at 85 dBA or more can cause hearing loss, so turn it up only until it covers the sounds that bother you. Put your phone across the room, not by your head. For sleep, stay under 50 dB and set the timer so it fades out instead of playing all night.
In principle it can mask low, steady noise such as traffic rumble, because its energy sits in the same low range. But almost no research has tested brown noise for sleep, and the evidence for noise in general is very low quality. If you use it, stay under 50 dB and set the timer.
No study has tested brown noise for focus or studying. If you study fine in quiet, you may not need it. If steady background sound helps you, keep it low and notice whether it does.
No study has tested brown noise for tinnitus. If low brown noise makes the ringing easier to ignore, keep the volume low and see if it helps. If the ringing is new or bothers you, see a GP or audiologist.