Your Cycle, Your Privacy
Track your period, ovulation, and fertility windows with complete privacy. Available on iOS and Android. No accounts. No cloud. No data sharing.
Features
Cycle Tracking
Log period start/end dates, flow levels, and symptoms with an intuitive interface.
Smart Predictions
On-device machine learning predicts your cycle, ovulation, and fertility windows.
Calendar View
Visual calendar showing your period, fertile window, and predicted ovulation day.
BBT & Mucus Tracking
Track basal body temperature and cervical mucus to improve prediction accuracy.
Insights
View cycle regularity, mood trends, and symptom patterns over time.
Backup & Export
Export your data anytime. Your data belongs to you.
Privacy First
Luna is built on a simple principle: your health data is yours and yours alone. We don't believe in tracking, profiling, or monetizing your personal information.
- No cloud storage — All data stays on your device in a local SQLite database
- No accounts required — Use the app immediately without signing up
- No data sharing — We never sell, rent, or share your data
- No analytics — We don't track how you use the app
- On-device ML — Predictions happen locally, not on our servers
Download Luna
Available on iOS and Android
iOS 15.0+ • Android 8.0+