How can we help?

Simply open Luna and tap the "Log Period" button on the calendar view. You can enter your period start date, flow level, and any symptoms you're experiencing. The app will automatically begin tracking your cycle and making predictions based on your input.

Yes, absolutely. All your data is stored locally on your device in a secure SQLite database. We don't use cloud storage, we don't collect analytics, and we don't share your data with anyone. Your health information never leaves your device.

Luna uses on-device machine learning to analyze your cycle patterns. Predictions become more accurate over time as you log more data. Most users see reliable predictions after 2-3 cycles of consistent tracking. You can also improve accuracy by tracking additional data like BBT and cervical mucus.

Yes! Go to Settings > Export Data to download all your tracked information in a secure format. Your data belongs to you, and we make it easy to take it with you if you ever switch apps or want a backup.

Since Luna stores all data locally on your device, if you lose your phone without a backup, you would need to start fresh. We recommend exporting your data periodically using the export feature in Settings to keep a safe copy of your information.

No account needed! Luna works completely offline without any sign-up process. Just download and start tracking immediately. Your data stays on your device and is never tied to an account or email address.