Brown noise, made the way you like it.
Then saved for every night after.
Shimmr lets you pick brown or deep brown noise, take the bright edge off, shape it with EQ and lay it under rain or your own music. Save the mix once and it’s there every night. No ads, it works offline and it keeps playing with the screen off.
What you can shape
What brown noise is
Noise whose power falls as the pitch rises, by about 6 dB per octave, so most of the energy sits low. It sounds deeper than white or pink noise, like a strong wind or a far waterfall. The name comes from Brownian motion, not the colour.
Brown or deep brown
Start with brown, or choose deep brown for an even lower, rounder rumble. Pink, white, green and other colours are there too.
Cut the bright top
High Cut takes away the hiss at the top. Turn it up until the noise feels soft enough to sleep under.
Shape it with EQ
Lift the low end or ease off the middle until it sounds right in your room, on your speaker or in your earbuds.
Rain or your own music on top
Set the noise under rain, ocean or thunder, or bring in your own music with Add Music. Each layer has its own level.
Save the mix
Save it once and come back to the same sound tomorrow, with nothing to set up again.
Made for nights
A timer that fades out
Set the sleep timer and the sound fades away slowly instead of stopping with a click.
Screen off, other apps on
Brown noise keeps playing with the screen locked, and it can play alongside a podcast or another app.
Works offline
Every sound is made inside the app, so it plays on a plane or in a cabin with no signal.
No ads
Nothing interrupts the noise. The App Store privacy label for Shimmr reads Data Not Collected.
What the research says
Many people like brown noise for sleep or focus, but research on it is limited and mixed, and most studies used white or pink noise. Treat it as a sound you enjoy, not a treatment. The articles below look at the evidence.
Noise colours in Shimmr
Each colour spreads its energy differently between low and high sounds. The more energy sits low, the softer it sounds.
- 1 Brown Deep and soft, like heavy rain on a roof or a strong wind.
- 2 Deep brown Even lower and rounder. Mostly rumble, almost no hiss.
- 3 Pink Power falls about 3 dB per octave, so every octave has equal energy. Softer than white, like steady rain.
- 4 White Equal power across all frequencies. A bright, even hiss, like a fan.
- 5 Green No strict standard. Usually noise with most of its energy in the middle, a little like a distant waterfall.
Hear it
Thirty seconds from the app. Brown Noise plays on any speaker. Awake → Asleep lays rain and crickets over binaural beats, so use headphones for that one.
Questions
Which brown noise app lets you adjust the sound?
Shimmr lets you pick brown or deep brown, cut the bright top with High Cut, shape it with EQ, add rain or your own music and save the mix. It runs on iPhone and iPad.
Is there a free brown noise app?
Shimmr is free to download and has no ads. The first journey, Arrival, is free, and Shimmr Premium unlocks the full library.
Can brown noise play all night with the screen off?
Yes. Shimmr keeps playing with the screen locked and works offline. You can also set a sleep timer that fades the sound out.
Does brown noise help with sleep or ADHD?
Some people find it helps them settle or focus, but research on brown noise is limited and mixed, and most studies tested white or pink noise. If sleep or attention problems affect your days, talk to a doctor.
Can I play brown noise with Spotify or a podcast?
Yes. Turn on Play Audio with Other Apps in the mixer’s Preferences and Shimmr plays alongside other apps. You can also add your own music inside the mixer.
Shimmr is not a medical device. Keep the volume low, and never listen while driving.
