Install on Android.
Until Google Play approves the listing, install the APK directly from this site. Same install you'd get from the Play Store, with one extra "allow this source" tap.
1Download the APK
Tap the Download APK button above from your Android
phone. Your browser will save the file to your
Downloads/ folder. Don't have your phone with you?
You can also download from a computer and email it to yourself,
or transfer it over USB.
2Open the file
Open Downloads/ from your file manager, or pull down
your notification shade and tap the "Download complete" notice.
Either way, tap the SimpleSleepSounds-v1.0.apk file
to start the install.
The first time you install an APK from your browser, Android will ask you to allow this source. It's a one-time per-app setting and protects you from random websites drive-by-installing things. You're telling Android: yes, I asked Chrome to do this.
3Install & open
Tap Install at the bottom of the install dialog. When it finishes, tap Open. You'll see a near-black screen with the brown noise color selected and a big play orb in the middle. That's the app.
Pick a color from the list — white, pink, brown, blue, or violet. Optionally set a sleep timer from the bottom row. Tap the orb to play. After about 8 seconds of no input the screen fades to black with just the countdown showing; long-press to wake it.
If something doesn't work.
Chrome won't let me install — "this app may harm your device"
Chrome flags every sideloaded APK with this warning regardless of source. Tap Keep when downloading, then Install anyway if asked again.
You can verify the file is genuinely ours by checking its
SHA-256: open a terminal and run
sha256sum SimpleSleepSounds-v1.0.apk. The output
should match this exact hash:
5741361e847a7dc21eb49b2125ba7c1032381bb272818901465979de63680116
"App not installed" / "App not installed as package appears to be invalid"
Usually this means the download was interrupted. Open
Downloads/, delete the file, and re-download
over a stable connection.
If you're on Android 6 (Marshmallow) or older, the app won't install — we require Android 7+ (API 24) for the audio engine we use. Sorry. If you can update your OS, please do; otherwise your phone is unfortunately out of range.
The "Install unknown apps" toggle is missing or greyed out
On work-managed phones, your IT admin may have disabled sideloading entirely. There's nothing the app can do about that — you'll need to wait for the Play Store listing (coming soon) or use a personal device.
On Samsung devices, the toggle is sometimes hidden under Settings → Apps → Special access → Install unknown apps.
Is this really free? What's the catch?
It really is. There is no catch. There are no ads, no in-app purchases, no premium tier. We don't collect any data, don't have analytics, and don't have a server to send data to in the first place.
The whole app is a few hundred lines of Kotlin, MIT-licensed. You can read it, fork it, or rebuild it yourself if you want.
Why isn't it on the Play Store yet?
It's submitted and we're waiting for Google's review. Until then, sideloading is the only way to get it. We'll update this page the moment the Play listing is live.
No, we don't plan to add tracking or microtransactions to "qualify" — if Google rejects an audio-only app that doesn't collect data, that's their loss.
Can I install on iOS?
Not yet. iOS doesn't allow sideloading the way Android does, so we'd need to ship through the App Store — a separate codebase and review process. If there's enough interest we'll build an iOS version next. Email us if you want one.