Lune Cycle Tracker

Track your cycle privately. All data stays on your device — no accounts, no uploads, no ads. Just simple, accurate period and fertility tracking.

Lune is a simple, private period tracker designed to help you understand your cycle without compromising your health data. Log your period dates and Lune automatically predicts your next period, fertile window, and ovulation day. The more cycles you log, the more accurate the predictions become. Features: • Track your menstrual cycle and predict future periods • See your fertile window and estimated ovulation day • Understand your cycle phase (menstrual, follicular, ovulation, luteal) • Gentle reminders 2 days before your next expected period • Beautiful, easy-to-read week strip showing where you are in your cycle Your privacy is the priority: Lune stores all data locally on your device only. No account required. No data is ever uploaded to a server, shared with third parties, sold, or used for advertising — ever. Uninstalling the app permanently deletes everything. Lune is not a medical device and does not provide medical advice. Cycle predictions are estimates based on your logged history.