Privacy policy: Plain Intervals: HIIT Timer

Last updated: 26 October 2026

In short

Plain Intervals collects nothing. There is no account, no analytics, no advertising and no tracking. The Android app has no internet permission; the iPhone app makes no network requests. Your timers and workout history stay on your phone.

Who is responsible

Plain Apps, Residenzstr. 5, 80333 Munich, Germany. Email: plainapps@tuta.com.

What the app stores on your phone

Your timers, your workout history (date, timer name, planned and actual time, skipped intervals, pauses, your notes), your settings, and spoken cues rendered from your timers' interval names by your phone's own text-to-speech voices. All of this lives in the app's private storage on your phone. We cannot see it.

Permissions

Android: a foreground service for media playback, a wake lock and vibration, so the interval cues keep playing on time with the screen off and the notification can pause, skip or end the workout. iPhone: background audio for the same reason, and an optional Live Activity that shows the running workout on the Lock Screen. The app asks for no permission at start, and never for your location, microphone, camera, contacts, photos or health data.

Voices

Spoken cues use the voices installed on your phone. The app renders the cue words (interval names and numbers) on the phone and does not choose online voices. If your phone uses a third-party speech engine, that engine's own policy applies to it.

Sharing, exports and backups

Nothing leaves your phone unless you share it yourself: a timer link or timer file, a CSV export of your history, or a backup file. You choose the app or person you send it to. A timer link contains only the timer (names, durations, colours), never your history. Backup files are kept in the app's storage until you share or delete them.

Phone backups

Like every app's data, the app's data can be part of your phone's own backup (iCloud or computer backup on iPhone; Android device backup) when you have turned that on; that backup is between you and Apple or Google.

Children, advertising, selling of data

The app has no ads, sells nothing and shares no data with anyone. It is not directed at children.

Your rights

Because we receive no data, there is nothing we could look up, correct, export or delete for you. Deleting a workout in the app deletes it; uninstalling the app removes everything it stored. Questions: plainapps@tuta.com. You may also complain to a data-protection authority.

Changes

If the app ever changes what it does with data, this page will say so before that version is released, with a new date.