01
Brown, White, Pink and Green Noise
Every noise colour, plus rain on windows, ocean and forest birds — each one mastered to sit under whatever you are doing.
Premium Sound Experience
Brown noise and rain
for a room too loud to sleep in
Play white, pink, green or brown noise, rain, ocean and a fire. Nothing to download, no account. The sleep timer stops it once you are asleep.
Slo is a brown noise, white noise and sleep sounds app for iPhone, Android and Mac, with free browser players and a sound mixer at slonoise.com — layer brown noise under rain at your own levels and let the sleep timer stop it. Our guide to the best brown noise apps compared ranks the alternatives side by side.
Free web mixer · No download
Mix your own soundscape
Mix your own soundscape
right in your browser
Layer rain, ocean waves, brown noise, and nature sounds with individual volume controls. No app, account, or signup — just press play.
Open the free mixer
Works on any device with a browser.
Everything you need
for restful nights
02
Intelligent Sleep Timer
Set it and forget it. Sounds fade away gently as you drift off, never jarring you awake.
45m
03
Create Your Perfect Mix
Layer multiple sounds together with individual volume controls. Save your favorites for one-tap access.
Curated for
every moment
Noise
Scientifically-proven frequencies to mask distractions and promote deep focus.
- White Noise
- Pink Noise
- Brown Noise
- Fan Sound
- Air Conditioner
- Airplane Cabin
Nature
Immerse yourself in the calming sounds of the natural world, recorded in pristine quality.
- Gentle Rain
- Heavy Rain
- Rain on Window
- Ocean Waves
- Forest Ambience
- Thunderstorm
Loved by thousands
"Really happy with this app. Nice layout, all the options I want. Can mix and save, has a timer, no ads!"
— Dane H.
"I've used many different ambient sound apps and really appreciate the quality of sounds included in this app."
— Mazeppa
"Finally found the perfect app for my sleep routine. The brown noise is incredibly soothing and the interface is so intuitive."
— Sarah K.
Featured guides
Best Sounds for Focus
The sounds that help you concentrate and stay in flow.
Read guideBest Noisli Alternatives
Top apps to mix ambient sounds — and how they compare.
Read guideBest Sounds for Deep Sleep
What to play to fall — and stay — asleep through the night.
Read guideSlo vs Noisli
A side-by-side look at two popular ambient sound apps.
Read guideBest Brown Noise Apps 2026
The best apps for deep, rumbling brown noise this year.
Read guideBest Sounds for Studying
Backdrops that keep distractions out while you study.
Read guideReady for better sleep?
Join thousands who've transformed their nights with Slo.