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
From the blog
Science, guides, and comparisons.
Best White Noise Machine for Baby 2026: Safe Picks and Volume Guide
The best white noise machines for babies, plus the AAP safety rules on volume and distance that most buying guides skip entirely. What to buy and how to use it.
6 min read
Best White Noise Machine 2026: Honest Picks (And When to Skip One)
The best white noise machines in 2026 — what actually matters, which models are worth the money, and why a lot of people should save the cash entirely.
6 min read
Blue Noise vs White Noise: What's the Difference and Which to Use
Blue noise and white noise compared — frequency profiles, how each sounds, and which works better for sleep, tinnitus, focus, and masking specific sounds.
5 min read