Sound in every
shade.
Free noise generators for sleep, ADHD focus, and deep relaxation. Brown noise, white noise, pink noise — all in your browser, no download needed.
Most popular
The noises people listen to most for sleep and focus.
All noise colors
Every frequency on the spectrum.
What is color noise?
Color noise refers to different types of random audio signals, each named after a color by analogy with the visible light spectrum. Just as colors differ in their light frequency, noise colors differ in how power is distributed across the audible frequency range.
White noise has equal power at every frequency — the brightest, most neutral sound. Brown noise (or red noise) rolls off sharply toward higher frequencies, creating a deep bass rumble. Pink noise sits between them, with equal energy per octave — the most natural-sounding of the three.
These sounds work for sleep and focus by raising the ambient noise floor, which makes sudden disruptive sounds — a door slam, a car horn — less jarring by comparison. This is called sound masking, and it's the same technology used in hospitals, offices, and sleep clinics worldwide.
Sleep
Mask sudden sounds that wake light sleepers
ADHD Focus
Brown noise helps regulate attention and reduce distractions
Relaxation
Lower cortisol and anxiety with consistent sound
Not sure which one?
Four ways to decide, none of which need an account.
Which noise colour?
Three questions about what keeps you awake, then a recommendation with the reason.
Blind listening test
Five comparisons with the names hidden and the levels matched. Two minutes.
Spectrum comparison
Where each colour puts its energy, measured live from the real signal chain.
Noise machine comparison
Six machines on one grid — loops, minimum volume, lights, price.
From the blog
Science, guides, and comparisons.
Best Baby White Noise Machine — 50dB, 200cm Rules
AAP guidance is under 50dB and 200cm from the crib. 4 machines whose minimum volume is actually low enough, and the types to avoid entirely.
6 min read
Best White Noise Machine 2026 — 5 Picks From £30
5 white noise machines worth buying, £30 to £200 — plus the two-week free test that tells you whether you need to buy one at all.
6 min read
Blue Noise vs White Noise — Tinnitus and Alertness
Blue noise masks high-frequency tinnitus more efficiently; white noise covers more ground. Eight use cases compared, with the frequency reason for each.
5 min read