# Risetime

> Sunrise alarm clock app for Android. Your celestial alarm clock. Set your alarm relative to sunrise, sunset, noon, or nadir — it recalculates automatically every day as sunrise drifts with the seasons. Works fully offline with no internet permission. No analytics, no tracking, no data collection.

Risetime calculates astronomical sunrise and sunset times on-device using an embedded ephemeris engine (commons-suncalc). No API calls, no server, no internet connection. Your location stays on your phone.

Risetime supports both celestial alarms (anchored to sunrise, sunset, noon, or nadir with an offset) and standard fixed-time alarms. It uses Android's setAlarmClock API — the same system-level alarm mechanism as the built-in clock app.

Free with up to three alarms. A small optional subscription adds unlimited alarms.

## Links

- [Homepage](https://risetime.app/)
- [How It Works](https://risetime.app/how-it-works/)
- [Golden Hour Alarm for Photographers](https://risetime.app/golden-hour-alarm/)
- [Circadian Rhythm Alarm](https://risetime.app/circadian-rhythm-alarm/)
- [Privacy Policy](https://risetime.app/privacy/)
- [Google Play](https://play.google.com/store/apps/details?id=com.deltawaken.risetime)

## Key Facts

- Platform: Android (API 33+)
- Developer: A. Deltawaken
- No INTERNET permission — the app cannot connect to the internet
- No analytics, crash reporting, or telemetry
- No accounts, no cloud sync
- Location used only for on-device sunrise/sunset calculation
- Alarm times stored as UTC epoch millis, recalculated daily by a background worker