Privacy Policy

Sway helps you pace your alcohol intake by estimating your blood alcohol concentration (BAC) from what you log. This policy explains what data the app handles and where it goes. In short: nowhere.

What the app stores

To do its job, Sway stores the following on your device only:

• Drinks and food you log (type, volume, strength, timing)
• Body parameters you enter (weight, sex), used solely for the BAC estimate
• Your settings (target zone, units, reminder preferences, driving-limit display)
• Finished sessions and the ratings you optionally give them (overall, hangover, memory)

Where the data goes

• Your data lives on your device. Sway has no server, no account system, and no network access for your data. Nothing is ever sent to the developer. There is nowhere for it to be sent.
• Android backup. Your data is included in Android's own backup so you keep your history when you switch or reset a phone. On Android 12 and newer this backup is end-to-end encrypted with your device's lock screen. Neither Google nor the developer can read it. A device that can't provide that encryption is excluded from cloud backup entirely. Android versions older than 12 are excluded from cloud backup too; there you keep your history with the in-app Export and Import instead. Device-to-device transfer, which you start yourself when moving to a new phone, stays local.
• No analytics, no tracking, no ads. The app contains no third-party SDKs that collect data.
• Uninstalling the app removes your data from the device. A copy may remain in your own encrypted Android backup until it expires or you delete it from your Google account.

Permissions and background behavior

• Notifications: used for the ongoing session status and the check-in reminders you configure. You can decline the permission or turn either off in settings.
• Vibration: check-in reminders vibrate strongly, so they cut through a loud night. You choose the style, or turn them off.
• Foreground service: while a session runs, a small service keeps the status notification current and fires your reminders on time. It starts only when you start a session and stops when the session ends. It does not use sensors, location, or the network.
• Start after reboot: if your phone restarts mid-session, the app restores the session notification. Nothing else runs in the background.

Your controls

• Export: Settings, Your data, Export shares your complete data as JSON with any app you choose. Data you export leaves the app's control.
• Import: Settings, Your data, Import loads a previously exported JSON file, replacing everything currently in the app (after a confirmation).
• Delete: Settings, Your data, Delete all removes everything and resets the app to a fresh state, immediately.

Health disclaimer

BAC values shown by Sway are population-average estimates, not measurements. They must never be used to decide whether you are fit to drive or to make any other safety decision.

Changes and contact

Material changes to this policy will be noted in the app's release notes.

Questions: support@swayapp.no