What is brown noise?
Brown noise (also called red noise or Brownian noise) is a type of sound signal whose power drops by 6 decibels per octave as frequency rises. In plain terms: the higher the pitch, the quieter it gets, so the low end dominates and the hiss of the treble almost disappears.
The name has nothing to do with the color brown. It comes from Brownian motion — the random walk of particles — which is the mathematical process used to generate the signal. Our engine produces it in real time, so the sound never repeats.
Benefits of brown noise
Brown noise works by masking: it fills the sound space with steady, predictable energy so sudden noises — a slamming door, a barking dog, a noisy neighbor — no longer stand out. Your brain stops tracking them, and it becomes easier to drift off or stay in flow.
- Sleep: the deep, even rumble covers disruptive night sounds and gives the mind something neutral to settle on.
- Focus & deep work: developers, writers, and students use it to block office chatter and sustain concentration.
- ADHD: many people report that the low rumble quiets mental restlessness (see our brown-noise-for-ADHD guide).
- Relaxation: the bass-heavy tone is calming and less fatiguing than brighter noise over long sessions.
How to use the brown noise player
Press play and adjust the volume to the lowest level that still masks your surroundings — louder is not better. Use the Tone slider to make the sound warmer (darker) or brighter to taste, and switch on Waves for a gentle ocean-like rise and fall. Set a Sleep Timer if you want it to fade out after you fall asleep.