Private Period Sync

Private Period Sync is a private period and cycle diary for Android. Log how you feel in a few taps, keep history on this phone, and optionally sign in with Google to sync. Invite a partner only if you want — they see the windows you choose, not your full notes. This app is not a medical device. It does not diagnose, treat, or replace a clinician. Cycle and fertile windows are estimates, labelled as estimates. WHAT YOU CAN LOG • Period days and flow (none, spotting, light, medium, heavy) • Pain (0–5) and mood • Private notes • Edit or delete a day anytime (delete asks you to confirm) TODAY AND HISTORY • A timeline centered on today • A cycle strip using your period and cycle length defaults • History grouped by month — tap a day to change it • Insights from your own logs (counts and averages). Guidance only. REMINDERS • Optional cycle reminders and a nightly check-in • Optional period facts • Partner care tips only if sharing is on and they opt in • Notifications need permission; you can leave them off PRIVACY ON THIS PHONE • Logs start in an on-device SQLite database. You can use the app fully offline. • Optional PIN lock, with fingerprint or biometric unlock when the device supports it • Optional disguise launcher icon and label (notes, calculator, weather, or calendar) so the home screen does not advertise a period app • Light, dark, or system theme GOOGLE SYNC (OPTIONAL) • Sign in with Google to back up cycles and daily logs to Firebase • Skip sign-in and stay local-only • Sign out anytime; logs already on this device stay until you delete them PARTNER SHARING (OPTIONAL) • Create an invite and choose what to share: period window, PMS window, fertile estimate, support notes • Revoke sharing at any time • Partners see a limited view meant for support, not your private diary