Deep brown noise, ready to play
Press Play. What you hear is brown noise, generated in your browser from random numbers: each sample is the previous one plus a small random step, which gives the sound its strong lows and soft highs. Because it is generated live rather than played from a recording, it never loops, however long you leave it on.
On this page the Tone slider starts at 60%, which filters off more of the remaining hiss for a deeper rumble, often described as sounding like a waterfall behind a wall, the inside of an airplane or a heavy shower in the next room. The ridges on the screen show the sound’s spectrum from low (left) to high (right): with brown noise they pile up on the left.
Setting it up
Start with the volume low and raise it slowly; steady noise feels louder the longer you listen. For sleep, set the sleep timer to the length you want and choose a fade so it dims gently rather than stopping suddenly. For focus, try adding a little pink noise or a soft drone on top; each sound has its own level.
Brown, pink or white?
Brown noise is the deepest of the three. Pink noise keeps a little more of the high end and sounds like steady rain. White noise is the brightest and hisses like a detuned radio. If brown noise feels too muffled, switch on pink noise alongside it at a lower level, or raise the tone.
What this page plays
| Sound | Level |
|---|---|
| Brown noise | 65% |
Add or remove sounds and move the levels as you like. This page always opens with the mix above. The full white noise generator remembers your own mix.