Slo: Sleep Sounds, Brown Noise

Contains adsIn-app purchases
4.2
422 reviews
10K+
Downloads
Content rating
Everyone
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Screenshot image
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About this app

Sleep sounds app with brown noise, white noise, pink noise, and rain sounds to help you sleep better, focus, and relax. Download the best sleep sounds and noise app today.

Premium Sleep Sounds


Experience scientifically proven audio for better sleep. Slo offers brown noise for deep focus, white noise to block distractions, pink noise for restful sleep, and nature sounds like rain and ocean waves.

Key Features


Brown noise - Deep, rich tones for concentration and sleep
White noise - Mask background noise and distractions
Pink noise - Gentle frequencies for deeper sleep
Rain sounds - Natural rainfall and thunderstorms
• Ocean waves, waterfalls, and nature sounds
• Timer and mix multiple sounds
• Offline playback - no internet needed

Benefits


Sleep Better: Fall asleep faster with soothing sleep sounds designed for bedtime. Improve sleep quality naturally.

Boost Focus: Block distractions with brown noise and white noise. Perfect for studying, working, or reading.

Reduce Stress: Calm your mind with relaxing nature sounds. Lower anxiety and promote relaxation.

Aid Meditation: Enhance mindfulness with ambient sounds that help you stay present.

Why Choose Slo?


The #1 sleep sounds app trusted by millions. High-quality audio, simple interface, and proven results. Free to download with premium sounds available.

Download Slo now and experience better sleep tonight.
Updated on
Mar 12, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Location, App activity and 2 others
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

4.2
409 reviews
Melissa Price
October 16, 2025
OFFERS A ONE TIME PURCHASE!!!! there are subscription options too, but this is HUGE for me. I'm sick of finding self help apps that will only help you if u can remain consistently employed. The free version is great too, other apps make me watch an advert to play the sound i want... while I'm trying to sleep. Im yet to experience that with this app. I will be making that one time purchase at my earliest convenience lol.
14 people found this review helpful
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Sleep Sounds Sound Machine
October 16, 2025
Thanks, appreciate your kind words!:) Subs make sense with apps that have recurring costs per user, but in this case, they are low enough that I can afford to offer one-time payments. Glad you enjoy it! and if you need anything, lmk, I'm available via email or on Discord (find it in app settings)
Sarah
June 25, 2025
absolutely love this app! i depend on white noise as background noise due to sound sensitivities and this app runs it perfectly! i love that running the sound in the background is a free option, where as most apps make you pay for that, or it doesnt work. i switched to this one for that reason and i dont plan on going back! also not to mention the variety of sounds that are free and even more if you pay the subscription. keep doing what you're doing the way you're doing it!
9 people found this review helpful
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Sleep Sounds Sound Machine
June 25, 2025
Thanks! You've made my day with this awesome review! Stay tuned, more sounds coming!
Saiadana Anadaias
August 31, 2025
This app is great except for the fact that it shuts off randomly during the night and wakes you up. If it were consistent and played throughout the night it would be 5 stars easily. I've done all the optimization they recommend and it still shuts off every night. Reply: Yes my phone is always on the charger every night when using the app. Edit: What I'm hearing from the developer is that the app isn't compatible we with Samsung and instead of fixing the issue they blame the phone manufacturer.
5 people found this review helpful
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Sleep Sounds Sound Machine
August 31, 2025
Hi, this is not intended on our side and not the apps fault. It's the Samsung's system overly optimized to save the battery and randomly stopping long running apps. Did you check dontkillmyapp.com/samsung? Reply: if it would be possible for me to fix I'd do it long time ago, but apps can't control your system. I have no motivation to break the app.

What’s new

Bug fixes and improvements