CYCLIOA period tracker that works offline and keeps your cycle on your phone.
Tap once when your period starts. Cyclio learns your next period and fertile window from your own cycles, shows honest date ranges, and keeps everything in an encrypted diary on this phone. No account, nothing to lose when you change phones except a backup file you keep.
Get it on Google PlayFree with ads: logging, predictions, the calendar, history of every cycle, a one-page summary for your doctor, reminders, the widget, app lock and backup are always free. Cyclio Pro is a one-time purchase: symptom patterns, the full doctor report, pill reminders, discreet icons, extra themes and no ads.
One tap when it starts
Log your period, flow, symptoms, mood and notes in a couple of taps — from the app or the home-screen widget.
Predictions that learn from you
Next period and fertile window as a likely range from your own history, with Pause for the pill, pregnancy or breastfeeding and an Irregular mode.
Private by design
No account and no sync. Your cycle data is encrypted on your phone, left out of Google backup, protected by an optional app lock, and never sent to ads or analytics.
Works offline
Every screen works in airplane mode, even on first launch. Back up to a password-protected file you keep and restore it on your next phone.
Cyclio is not a medical device and does not diagnose, treat, cure, or prevent any medical condition. Predictions and the fertile window are estimates only and must not be used as a method of birth control. The free version shows ads and uses Google Firebase for anonymous analytics and crash reports — see the privacy policy for exactly what the app sends.