OpenBreath
Privacy policy
Last updated 22 August 2026OpenBreath stores your training data on your own phone. There is no OpenBreath account and no OpenBreath server. Nothing leaves your device unless you choose to sign in to Google and back up, and that backup goes to your own Google Drive.
1. Who is responsible
OpenBreath is an independent app published by Marcos Cilleruelo. For any question about this policy or your data, write to info@apneastatic.com.
2. What the app stores on your device
| Data | Why |
|---|---|
| Breath measurements: volume in millilitres, date and time, whether it was an inhale or an exhale, the practice you tagged it with, an optional name you typed, and two raw values reported by the device. | To show your history, bests and trends. This is the app's entire purpose. |
| The identifier and name of the last Bluetooth device you connected to. | To reconnect automatically instead of making you scan every time. |
| Your settings: language, selected practice, last tab, whether automatic backup is enabled. | So the app opens in the state you left it. |
| If you sign in with Google: your email address and display name. | To show which account is signed in. Stored locally only. |
This data is held in the app's private storage. It is not transmitted to us — we operate no server and receive none of it.
3. Google sign-in and Google Drive (optional)
Signing in is optional and the app is fully usable without it. If you do sign in, the app requests one Drive permission:
drive.appdata
This grants access to a hidden folder in your Google Drive that belongs to this app
alone. The app cannot see, read, or modify any other file in your Drive,
and this is enforced by Google, not merely promised here. The only thing written there is
a single file, openbreath-backup.json, containing the same measurements you
can already export yourself.
Backups are manual by default. If you switch on Back up automatically, the app uploads that same file shortly after a training session. Restoring only ever adds measurements — it never deletes or overwrites what is already on your phone.
Your Google credentials are handled by Google's own sign-in screens. The app never sees your password, and it does not store long-lived access tokens.
4. Analytics
The app includes Google Firebase Analytics, which collects usage and diagnostic information such as app opens, in-app events, and general device and operating-system details, together with an app-instance identifier generated by Google. It is used only to understand whether the app works and which parts are used.
Your breath measurements, their names, and your email address are never sent to Analytics. Google processes this data as described in the Firebase privacy documentation.
5. Bluetooth and location permissions
The app uses Bluetooth to talk to the training device. On Android 11 and older, the operating system requires a location permission before any app may scan for Bluetooth devices at all. The app therefore declares that permission for those versions only, and does not collect, use, or derive your location in any way. On Android 12 and newer the permission is not declared, and the Bluetooth scan is marked as never being used to determine location.
6. What is not done
- No advertising, and no advertising identifiers.
- No selling or sharing of personal data with third parties.
- No third-party analytics or tracking beyond Firebase Analytics described above.
- No account on our side, because there is no server on our side.
7. Keeping, deleting and taking your data
Step-by-step instructions are on the delete your data page.
- Export. Account → Data → Export to a file writes every measurement to a plain JSON file you control.
- Delete locally. Account → Delete all data removes every measurement from the phone. Uninstalling the app also removes its local storage.
- Delete the Drive backup. Revoke the app at your Google account permissions; removing an app's access removes its hidden app-data folder. You can also manage app data from Google Drive's settings.
- Retention. Local data stays until you delete it or uninstall. The Drive file stays until it is overwritten by a later backup or you remove it as above.
8. Children
OpenBreath is not directed at children and is not intended for use by anyone under 18. Breathing exercises of this kind carry real risk, which is why the app is declared for adults on Google Play.
9. Changes
If this policy changes, the date at the top changes with it. Material changes will be reflected in the app before they take effect.