Baku Sleep
Privacy Policy
Last updated 7 September 2026 · Applies to Baku Sleep for Android (com.bakusleep.app)
The short version. Baku Sleep records sound in your bedroom while you sleep. Those recordings stay on your phone. There is no account, no sign-in, and no server: the published version of the app does not hold Android's INTERNET permission, so it is not able to send anything anywhere, whatever any policy document claims.
Who is responsible
Baku Sleep is made and published by the Speji team. Questions about this policy or about your data go to support@speji.com.
What the app records
When you start a night, Baku Sleep listens through your phone's microphone until you end that night. It keeps three kinds of thing, all of them on the device:
- Short audio clips. The app does not record the whole night. It records the moments that are louder than the room around them — a snore, a cough, a passing lorry — and writes each one as a separate audio file.
- Loudness measurements. A continuous, second-by-second record of how loud the room was, which is what draws the charts. It contains no sound and cannot be listened to.
- Times and settings. When each night began and ended, when each sound happened, and the settings the app was running under.
The app does not ask for, and has no way to obtain, your name, your email address, your contacts, your location, your device identifiers or your advertising ID.
Where it is stored
Everything is written to the app's own private storage area on your phone, which Android keeps unreadable to other apps. Audio clips are additionally encrypted with a key held in the Android Keystore, the phone's hardware-backed key store, so a clip file copied off the device is ciphertext. If a particular device cannot provide that key, the app records the clip unencrypted rather than losing your night, and says so in its own logs.
The app is excluded from Android's automatic cloud backup (allowBackup="false"), so your nights are never copied to Google Drive as part of a device backup.
What is sent off the device: nothing
Baku Sleep has no analytics, no crash reporting, no advertising, and no third-party SDK that collects anything. It contacts no server, because it cannot: the release build published on Google Play declares no INTERNET permission, which means the operating system itself refuses any network request the app might attempt. This is checked automatically as part of the app's build.
Permissions, and why each one exists
| Permission | What it is for |
|---|---|
RECORD_AUDIO | The microphone. This is the one permission the product exists for. It is requested when you first tap to start a night, never silently, and recording stops when you end the night. |
FOREGROUND_SERVICEFOREGROUND_SERVICE_MICROPHONE | Lets recording continue with the screen off. Android requires a permanent notification to be visible in your shade for the whole time the microphone is in use, which is how you can always tell the app is listening. |
POST_NOTIFICATIONS | To show that notification. Without it Android will not let a microphone service run at all. |
WAKE_LOCK | Keeps the processor awake so the microphone keeps being read through the night. Without it Android suspends the app and the night stops silently. |
REQUEST_IGNORE_BATTERY_OPTIMIZATIONS | Lets the app show Android's own "stop optimising this app" dialog during setup. Holding the permission grants nothing on its own; only your answer to that system dialog does. |
RECEIVE_BOOT_COMPLETED | Used by Android's scheduling library so the nightly clean-up job survives a restart. The app registers no start-up behaviour of its own. |
VIBRATE, ACCESS_NETWORK_STATE, SYSTEM_ALERT_WINDOW, MODIFY_AUDIO_SETTINGS, READ_/WRITE_EXTERNAL_STORAGE | Declared by the frameworks the app is built on, not used by Baku Sleep. The storage pair is capped at Android 12 and is unreachable on any phone the app supports. |
How long it is kept, and how to delete it
Nights stay on your phone until you remove them. You can delete a single night from inside the app, which deletes its clips and its measurements together. You can set a retention period in Settings, after which older nights are removed automatically. Uninstalling the app deletes everything it ever recorded, because all of it lives inside the app's private storage.
There is no copy anywhere else, so there is nothing to request from us and nothing for us to delete on your behalf.
Recording other people
A microphone in a bedroom may capture people other than you. Making everyone who sleeps within earshot aware that the room is being recorded is your responsibility, and the law on recording other people differs from country to country. The app is built so that the recording is always visible while it is happening.
Children
Baku Sleep is not directed at children and is not designed for use by anyone under 13.
Your rights
Under the GDPR you have rights of access, correction, erasure and portability over personal data held about you. Here they are satisfied by the design rather than by a request form: the data never leaves the device you control, we hold no copy of it and cannot see it, and erasure is a control inside the app rather than a request to us. There is no export feature at present, and no copy anywhere for us to hand over.
Changes to this policy
If a future version of the app changes what it collects or where it goes, this page changes with it and the date at the top is updated. A change that introduced any transmission of your recordings would be described here plainly and would require the app to ask for network access it does not currently have.