A deep, low-frequency rumble like a distant waterfall. Increasingly popular for people with ADHD who find white noise too harsh.
No account needed · Free download for Mac
What is it
Brown noise (also called Brownian or red noise) emphasizes lower frequencies much more than white noise, creating a deep, warm rumble similar to a waterfall, strong wind, or the roar of a jet engine heard from inside. It gets its name from Robert Brown and Brownian motion, not the color. Brown noise has surged in popularity on social media, particularly among people with ADHD who report that it helps quiet racing thoughts and improve task focus.
Benefits
The deep, enveloping quality of brown noise can help quiet mental chatter, making it especially popular among people with ADHD and anxiety.
Because brown noise concentrates energy in lower frequencies, many people find it warmer and less fatiguing to listen to for extended periods compared to white noise.
The rich low-frequency content of brown noise overlaps with the fundamental frequency of human speech, making it particularly good at drowning out conversations.
Users frequently report that brown noise helps them enter and sustain flow states, possibly because its rumbling quality feels immersive without being stimulating.
Use cases
Research
While peer-reviewed research specifically on brown noise is still emerging, preliminary studies suggest that lower-frequency noise may be particularly beneficial for individuals with attention difficulties. A widely cited 2023 trend saw millions of ADHD users on social media reporting improved focus with brown noise, prompting increased scientific interest in frequency-specific noise benefits.
Mix & Match
ZeroHz lets you mix multiple sounds with independent volume controls
Explore more
Brown Noise plus 18+ other ambient sounds, lofi music, and a built-in focus timer. All from your Mac menu bar.
No account needed · 2hr/day free · macOS only