Press play on brown noise for traffic and bass through the floor, or rain if it’s a TV murmur, doors and footsteps keeping you up. It’s free in this browser, there’s no account to make, and the sleep timer stops it once you’re asleep.
Slo is a brown noise, white noise and sleep sounds app for iPhone, Android and Mac, and the browser players and sound mixer at slonoise.com are free to use. You can put brown noise under rain at whatever levels suit your room and let the sleep timer stop it. Our guide to the best brown noise apps compared ranks the alternatives side by side.
Rain softens a TV through the wall, but it won’t do much about the bass coming up through your floor. Put brown noise under it in the free mixer, set how loud each sound is, and press play. Nothing installs, and you don’t need an account.
Brown noise is a deep rumble, so it’s the one for traffic, a boiler or bass. White noise is a bright hiss that blurs the pitch of voices better, though no sound can take the words away. Rain, ocean and forest birds are there too, if a steady hiss feels too plain.
You don’t have to wake up later to turn the sound off. Give it 15, 30 or 60 minutes if you only need help falling asleep, or let a single sound run all night when sudden silence would wake you.
Put two or three sounds together and set the volume of each one on its own, so the rain stays gentle while the rumble underneath does the work. Save the mix and it’s waiting in this browser the next night.
These are the steady sounds, from the deep rumble of brown noise to the bright hiss of white. Give two of them a few minutes each at a modest volume and keep whichever one you stop noticing first.
Rain and waves move, so they give you something to follow when a flat hiss gets boring. Heavy rain is the rain people here play most.
"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.
See which sounds hold your attention on a task and which ones pull it away.
Read guideFind out which mixing apps come closest to Noisli, and where each one stops short.
Read guideChoose what to play when you fall asleep fine but keep waking up later.
Read guideRead the two apps side by side before you decide which one to keep.
Read guideCompare the apps that play deep brown noise, and see what each one leaves out.
Read guidePick a background that keeps the room from pulling you out of a study block.
Read guideSeven sleep sound apps, compared on mixing, timers, platforms and cost.
Read guideSee what each free white noise app gives you without paying, and where it stops.
Read guideCompare the free tiers of sleep and meditation apps, including what they hold back.
Read guideThe app keeps the mixes you build and plays them with your screen off, on iPhone, Android and Mac. Sounds you have played once are downloaded, so they keep working without a connection.
