--- title: "Slo: Sleep Sounds, Brown Noise - Reviews, Revenue and Downloads in United States | Apple App Store" description: "Slo is a brown noise and sleep sounds app for iPhone, iPad, and Mac, with 150+ curated sounds for sleep, focus, and relaxation. Play deep brown noise on its own, or mix it with rain, waves, and fan so" --- # Slo: Sleep Sounds, Brown Noise — United States > Sound Machine, Noise, Fan ![Slo: Sleep Sounds App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/8e/44/48/8e444870-2df7-002c-bc09-4c8cdc3612dc/AppIcon-0-0-1x_U007emarketing-0-11-0-85-220.png/434x0w.png) **Developer:** [KARLIE ALEXIS KOWALSKA](https://apptail.io/developer/karlie-alexis-kowalska-LybSEc) **Category:** Health Fitness **Rating:** 4.8/5 (66 ratings) **Price:** Free **Bundle ID:** com.ski.sounds.noise.machine.sleep **Store:** Apple App Store **Country:** United States **Version:** 3.135.3 (released 2026-10-22) **Original Release:** 2024-12-19 **Languages:** English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek (modern), Hebrew (modern), Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Chinese, Slovak, Spanish, Swedish, Thai, Turkish, Ukrainian, Vietnamese **App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6739538343) **AppTail Page:** [https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/united-states](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/united-states) ## Slo: Sleep Sounds Description Slo is a brown noise and sleep sounds app for iPhone, iPad, and Mac, with 150+ curated sounds for sleep, focus, and relaxation. Play deep brown noise on its own, or mix it with rain, waves, and fan sounds — each layer with its own volume — and set a sleep timer that stops playback automatically. KEY FEATURES • Brown noise – deep, low-frequency rumble many people choose for focus and sleep • White, pink & green noise – broadband noise colors for masking background sound • Binaural beats & frequencies – binaural beats, solfeggio tones (396–963 Hz, including 432 Hz and 528 Hz) and Schumann resonance tones • Rain sounds – steady rainfall and distant thunderstorms • Waves & water – ocean waves, river, waterfall • Fan sounds – ceiling fan, table fan, airplane cabin • Nature & ambience – forest, birds, wind, fireplace, campfire, train • Sound mixing – layer sounds, each with its own volume control • Sleep timer – playback stops on its own after you drift off MADE FOR • Light sleepers who use steady sound to mask traffic, neighbors, or a snoring partner • Students and deep workers who keep brown noise or fan noise running for hours • People who wind down to binaural beats, solfeggio tones, or steady frequencies • People who use sound masking at night to make tinnitus ringing less noticeable • Anyone building a consistent wind-down routine — same mix, same timer, every night WHY SLO? A focused sound machine, not a content platform: 150+ curated sounds, a mixer with per-layer volume, and a sleep timer. No voices, no playlists — steady sound that sits in the background while you sleep, study, or work. Slo is free to download and try; the full sound library is a premium purchase inside the app. Terms of Use (EULA): Terms of Service: Privacy Policy: FREQUENTLY ASKED QUESTIONS What is the best app for brown noise? Slo is built around brown noise: play it on its own, or layer it under rain or a fan sound with a separate volume for each layer, and set a timer so it stops on its own. Does brown noise help you sleep? Brown noise doesn't treat anything — what it does is mask. A steady low-frequency sound covers unpredictable noise like traffic, doors, and snoring, which is why many light sleepers keep it running at night. Can I use Slo for tinnitus? Steady broadband sounds like brown and pink noise can help mask tinnitus ringing — many people set a low volume that makes the ringing less noticeable at night. Slo is a sound player, not a treatment; persistent or one-sided tinnitus needs a medical assessment. What are solfeggio frequencies and binaural beats? Slo includes solfeggio tones (396–963 Hz, with 432 Hz and 528 Hz), Schumann resonance tones, and binaural beats — steady tones many people play for meditation and winding down. Try one with headphones and keep it if you like it. What's the difference between brown, white, pink and green noise? White noise spreads energy evenly across all frequencies (like static). Pink noise shifts energy toward lower frequencies (like steady rain). Green noise centers on the middle of the spectrum. Brown noise goes deepest — a low rumble like a waterfall or strong wind. Slo includes all of them, so try each and keep what suits you. Can I use it for studying and focus? Yes. Many users prefer brown noise or fan noise as a steady background for studying and deep work, because a constant sound gives the ear nothing new to chase. Can I mix multiple sounds together? Yes. Layer brown noise with rain, add thunder over a fan, and set each sound's volume separately to build your own soundscape. Does Slo have a sleep timer? Yes. Set the timer when you press play and playback stops automatically. Is Slo free? Slo is free to download and try; the full 150+ sound library is a premium purchase inside the app. ## Slo: Sleep Sounds Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/0d/5e/f3/0d5ef3c9-63b4-41c4-e98c-4937fc45fb80/01.jpg/1242x2688.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/c5/ea/28/c5ea2829-517e-e7f4-975e-9eadb2109872/02.jpg/1242x2688.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/07/f0/8e/07f08e44-0bab-e6d1-71d5-581cc16b3da0/03.jpg/1242x2688.png) ## Slo: Sleep Sounds Rating Breakdown in United States - 5 stars: 57 (86%) - 4 stars: 7 (11%) - 3 stars: 2 (3%) - 2 stars: 0 (0%) - 1 stars: 0 (0%) ## Slo: Sleep Sounds Reviews in United States ### ***** "Chill" Simple, but with plenty of good options to mix -- fragilefrenchangel, 2025-05-13 ### ***** "Very good sound machine" I’ve tried a lot of sound machines to help me get to sleep faster and this is one of the best. The developer is still actively improving and adding features so it will only get better. It has a very nice selection of sounds to choose from. Good news! If a rooster crowing or a woodpecker hammering for lunch brings the sandman then you’re covered. The sounds can be mixed together and individual volumes can be adjusted. The campfire sound is too muted and there is no rain on a tent sound so i can relive all my family camping experiences. But i can hope for future additions to the library. You really should give this fine app a try. This helps me get to sleep faster so I am well rested for my morning woodpecker hunt. -- fumbleweed, 2025-03-27 ### ***** "Great multi-purpose sounds app!" Nice selection of white noise, gray noise, and others. Also includes peaceful nature sounds plus mixes. The only thing that could make it any better would be some relaxing nature videos or animated gifs to go along with the sounds. Recommended! -- BAR112, 2025-02-22 ### ***** "Developer solved billing problem that Apple would not" Contacted developed thru telegram and they solved a billing dispute resulting from price change as I was placing order. Apple refused to do anything. Anyway, shows integrity of developer -- whyaskforthis, 2025-02-22 ### ***** "Definitive white noise app" I’ve used a lot of sound apps because I travel a lot. This allows me to mix and match sounds, save custom presets, and adjust the volume of each so that I get the perfect mix. This has been a game changer. -- x6Bx, 2025-02-19 ### ***** "Reddit brought me here" This is an excellent app. So many options and sounds, yet very simple to use. A few taps and you can have a premixed soundscape like a Summer Night or a Rainy Day. Sleep timers are a breeze. Nicely done! -- olopezyes, 2025-02-19 ### ***** "My custom mix for falling asleep" I have used many different ambient sound apps in the past and really appreciate the quality of sounds included in this app. Not just white noise and gray noise, you have easily design your own favorite combination of these plus blue, light, pink, green noise and more. Plus, excellent nature, rain, and water sounds. Simple, clean interface. -- Mazeppa, 2025-02-19 ### ***** "Love this app!" So grateful for this app. It makes bedtime a breeze for my three littles who don’t go down easy lol. Mixing the sounds is fun too -- s1c2p3, 2025-01-17 ### ***** "just what I was looking for" really enjoy the selection of sounds, perfect for building my own wild campsite soundscape to doze off to. Looking forward to more sounds added! -- kuaintrelle, 2024-12-20 [View all Slo: Sleep Sounds reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews) ## Slo: Sleep Sounds Discovered Keywords - white noise sounds machine ## Slo: Sleep Sounds Available In - [United States](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/united-states) - [China](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/china) - [Taiwan](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/taiwan) - [Japan](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/japan) - [Germany](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/germany) - [United Kingdom](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/united-kingdom) - [Canada](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/canada) - [Poland](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/poland) - [Spain](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/spain) - [Hong Kong SAR China](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/hong-kong) - [France](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/france) - [Netherlands](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/netherlands) - [Italy](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/italy) - [South Korea](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/south-korea) - [Brazil](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/brazil) - [Ukraine](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/ukraine) - [Switzerland](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/switzerland) - [Romania](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/romania) - [Türkiye](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/turkey) - [Mexico](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/mexico) - [India](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/india) - [Belgium](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/belgium) - [Australia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/australia) - [Portugal](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/portugal) - [Saudi Arabia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/saudi-arabia) - [Chile](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/chile) - [Ghana](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/ghana) - [Colombia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/colombia) - [Bahrain](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/bahrain) - [Argentina](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/argentina) - [Macao SAR China](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/macau) - [Lithuania](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/lithuania) - [Luxembourg](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/luxembourg) - [Latvia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/latvia) - [Madagascar](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/madagascar) - 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[Sweden](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/sweden) - [Singapore](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/singapore) - [Slovenia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/slovenia) - [Slovakia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/slovakia) - [Senegal](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/senegal) - [Thailand](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/thailand) - [Tunisia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/tunisia) - [Uganda](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/uganda) - [Uzbekistan](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/uzbekistan) - [Venezuela](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/venezuela) - [Vietnam](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/vietnam) - [United Arab Emirates](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/united-arab-emirates) - [South Africa](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/south-africa) - [Armenia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/armenia) - [Angola](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/angola) - [Austria](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/austria) - [Azerbaijan](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/azerbaijan) - [Bulgaria](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/bulgaria) - [Brunei](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/brunei) - [Belarus](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/belarus) - [Belize](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/belize) - [Cyprus](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/cyprus) - [Czechia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/czechia) - [Denmark](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/denmark) - [Dominican Republic](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/dominican-republic) - [Ecuador](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/ecuador) - [Estonia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/estonia) - [Egypt](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/egypt) - [Finland](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/finland) - [Honduras](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/honduras) - [Croatia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/croatia) - [Hungary](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/hungary) - [Indonesia](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/indonesia) - [Ireland](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/ireland) - [Israel](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/israel) - [Iceland](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/iceland) - [Jamaica](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/jamaica) - [Jordan](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/jordan) - [Kenya](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/kenya) - [Kuwait](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/kuwait) - [Kazakhstan](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/kazakhstan) - [Lebanon](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/lebanon) - [Sri Lanka](https://apptail.io/app/slo-sleep-sounds-brown-noise-oeFu/sri-lanka) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. 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