# The white noise sleep app that plays all night Sostina is a free white noise app for Android. It makes White, Pink, Brown and Fan noise live on your phone, so the sound never loops, and it is built to keep playing until you stop it, through battery savers, calls and a dark screen. It works offline, and in the morning it shows you whether anything interrupted the night. Free. No account. Works offline. Android 8.0 or newer. ## Why sleep apps stop at night, and why Sostina keeps going Android saves battery by closing apps it thinks you are not using. At 3 a.m., a noise app with the screen off looks exactly like that, so many go quiet partway through the night. Sostina is built around not letting that happen. ### Runs as real playback Sostina plays as a foreground media service with its own notification, the way Android expects music to play. It holds a light wake lock only while the sound is on. ### One switch for the whole night In settings, “Let Sostina run all night” asks Android to stop putting the app to sleep. Turn it on once before your first night. ### Comes back gently If the system stops it anyway, Sostina restarts when Android allows it and fades back in from silence over 20 seconds, so the restart doesn’t wake you. ### Calls and alarms A call or an alarm pauses the noise, and it fades back in over 3 seconds afterwards. If a car or another Bluetooth device connects mid-night, Sostina pauses instead of following it. ### Up to 12 hours One night plays for up to 12 hours, then stops on its own. That covers a long night, or a 10-hour stretch of white noise, without a single repeat. ### Only you can start it Once a night is over, a headset or a car pressing play can’t start Sostina again. Only you can, from the app or its Quick Settings tile. ## White, Pink, Brown and Fan, made live Every noise is generated on your phone as it plays. There is no recording, so there is no loop and no seam to catch at 2 a.m. The noises are matched in loudness, so switching never makes you jump. ### White Every frequency at once. Bright and even, like a detuned radio. The most hiss of the four. ### Pink Softer at the top than white. Like steady rain on a roof, easy to leave on for hours. ### Brown Low and warm. Like a distant waterfall or the rumble inside a plane. ### Fan A steady, airy whoosh. Like a fan running across the room, without the draft. ### Fan noise for sleep, without the fan Plenty of people can only sleep with a fan running. Sostina’s Fan noise gives you that steady whoosh from your phone: no draft in winter, nothing to pack when you travel, and it keeps going all night like the other noises. It is generated live too, so it is not a short recording of a fan on repeat. If you have been looking for a fan noise app because a hotel room or a new flat is too quiet, this is what Fan is for. ### Brown noise vs white noise for sleep White noise has equal energy at every frequency, so it sounds bright and hissy. Brown noise puts most of its energy in the low end, so it sounds deep, like a rumble or a waterfall. Pink sits in between. Neither is proven better for sleep: research on noise and sleep is limited, and comfort is personal. Try each at a low volume for a few nights, and keep the one you stop noticing. The four noises compared: | Noise | Sounds like | Energy across pitch | Try it if you want | | --- | --- | --- | --- | | White | An even hiss, a detuned radio | Equal at every frequency | To cover sharp, high sounds | | Pink | Steady rain | Equal in every octave, so highs are softer | Something softer than white | | Brown | A distant waterfall, a low rumble | Falls steeply as pitch rises | Depth without hiss | | Fan | A fan running across the room | Mostly low and mid, with soft air on top | The sound of a fan, without the fan | ## Press once. It locks. Tap Play and the button turns into a lock. The controls go dim and stop responding, so a sleepy hand or a pillow can’t change anything. To stop, press and hold for just over a second while a ring fills. Leave it alone for ten seconds and the screen dims to near black with its brightness capped, so it never lights up the room. ## Persist keeps the night quiet Turn on Persist and Sostina sets Do Not Disturb to alarms only for the night. Calls, messages and notifications stay silent, your alarm still rings, and notification sounds don’t interrupt the noise. When you stop, your own Do Not Disturb settings come back exactly as they were. - Free, and off until you turn it on. - Needs Do Not Disturb access, which you grant once in Android settings. Sostina shows you where. - Emergency alerts, emergency calls and contacts you have allowed to bypass Do Not Disturb can still get through, and some phones’ own bedtime modes can override it. ## Light on battery, fully offline, never looped The things you don’t see matter most at night. Sostina does one job, quietly, with nothing running in the background that you didn’t ask for. ### Light on battery Only the noise you hear is generated, the screen can turn off, and nothing runs over the network. A night of noise is a small, steady job for the phone. ### Works offline Sostina has no internet permission at all. It plays the same in airplane mode, in a cabin or abroad. ### No loops The noise is made live from a random source, every second fresh. There are no audio files to repeat. ### Loud when you need it Volume is your phone’s own media volume. If that’s not enough, Boost adds about 8 dB on phones that support it. It’s off by default; keep it comfortable, especially with earbuds. ## A receipt for the night When you stop, Sostina shows what happened: how long it played, which noise, the time span, and a timeline with a notch for every interruption and its reason, such as a call, an alarm or the system stopping the app. If Android stopped Sostina, the receipt says so and links straight to the battery setting that prevents it. It is a record of the app’s reliability, not a sleep score. ## Download Sostina for Android Sostina is free. It installs directly from this site as an APK file, the same package format every Android app uses. ### On your Android phone [Download for Android (APK)Free · no account](https://sostina.app/download/sostina.apk) Version to be confirmed · size to be confirmed · Android 8.0 or newer · free - **Download.** Tap the button. Your browser may warn that this type of file can be harmful; it shows that for every app that doesn’t come from Google Play. Choose Download anyway. - **Allow this source.** Open the file. The first time, Android asks you to allow installs from your browser. Tap Settings, turn on “Allow from this source”, then go back. - **Install and open.** Tap Install, then Open. Google Play Protect may scan the app first; that’s normal. You can turn the browser permission off again afterwards. [Get it on Google Play](https://sostina.app/#) [Download on the App Store](https://sostina.app/#) ### On iPhone or iPad Sostina is Android-only for now. There is no iPhone or iPad version yet, and we would rather tell you than send you to the wrong store. An iPhone version may come later. ### On a computer Scan this code with your Android phone’s camera to download Sostina straight to the phone. Or [download the APK](https://sostina.app/download/sostina.apk) here and copy it to your phone. Show all download options ## Questions about Sostina ### Why do white noise apps stop playing at night on Android? Android saves battery by closing apps that look idle, and some phone makers add their own, stricter app killers. A noise app with the screen off can look idle, so the system stops it partway through the night. Sostina runs as a foreground media service with a notification, holds a light wake lock while it plays, and has one setting, “Let Sostina run all night”, that asks Android to leave it alone. If the system still stops it, Sostina restarts quietly when Android allows it and tells you in the morning receipt. ### Can Sostina play white noise all night, or for 10 hours? Yes. One night plays for up to 12 hours, then stops on its own. Because the noise is generated live, 10 hours of white noise is 10 hours of fresh noise, not a short track on repeat. ### Is it safe to play white noise all night? Many people sleep with steady background sound. The main thing to watch is volume. The [World Health Organization](https://www.who.int/news-room/questions-and-answers/item/deafness-and-hearing-loss-safe-listening) says adults can safely listen to 80 dB for up to 40 hours a week, and suggests keeping device volume at no more than 60% of maximum. For sleep, aim much lower: only as loud as it takes to cover the sounds that bother you, with the phone away from your head. Take extra care with earbuds and with Boost. If you have hearing problems or tinnitus, ask a doctor or audiologist what suits you. ### How loud should white noise be for sleep? Quiet enough that you could easily talk over it, and only as loud as it takes to cover the sounds that wake you. Start low and raise it one step at a time. Sostina uses your phone’s media volume, so the volume keys work as usual. ### Brown noise or white noise: which is better for sleep? Neither is proven better. White noise is bright and hissy; brown noise is deep, like a rumble. Pink sits in between, and Fan sounds like a fan across the room. Try each at a low volume for a few nights. See [brown noise vs white noise](https://sostina.app/#brown-vs-white) for the differences. ### Does Sostina work offline? Yes. Sostina has no internet permission, so it works the same in airplane mode and never sends anything anywhere. ### Does it keep playing with the screen off or locked? Yes. Turn the screen off or lock the phone and the noise keeps playing. Inside the app, Play locks the controls; press and hold to stop. ### Is Sostina free? Yes. Sostina is a free white noise app with no account to create. Every feature is included, Persist too. ### Is there an iPhone version? Not yet. Sostina is Android-only for now and needs Android 8.0 or newer. ### Is it safe to install an APK from this site? An APK is the package format every Android app uses; Google Play simply installs it for you. When you install from a browser, Android asks you to allow that source the first time, and Google Play Protect may scan the app. Only download Sostina from this site. [See the three install steps](https://sostina.app/#install). ### Does Sostina collect any data? No. It has no internet permission, no account and no analytics. Your settings and the night log stay on your phone. Read the [privacy page](https://sostina.app/privacy/). ## Tinnitus and white noise Some people with tinnitus use steady sound at night. Our guide explains how white, pink and brown noise are used, how to keep the sound gentle, and when to see a doctor or audiologist. [Read the guide](https://sostina.app/guides/tinnitus-and-white-noise/)