# Cykel — Private Period & Cycle Tracker (Android)

> Cykel is a free Android period tracker that stores all health data in an
> encrypted database on the user's device. No account, no cloud sync, no ads,
> no analytics. The only network traffic is anonymous crash reporting.

## App

- **Platform**: Android (Google Play: https://play.google.com/store/apps/details?id=com.cykel.tracker)
- **Developer**: Abhishek M R (independent developer)
- **Category**: Health & Fitness
- **Price**: Free
- **Contact**: feedback@cykel.in

## What it does

- Period and cycle tracking with smart predictions (next period, ovulation, fertile window)
- Symptom, mood, flow, sleep, weight and note logging
- Color-coded menstrual calendar and cycle history
- Insights: cycle length trends, period stats, frequent symptoms (3/6/12 months)
- Offline assistant ("Ask Cykel") that answers cycle questions from local data only
- Period reminders via local notifications
- Living ambient background scenes (aurora, petals, jellyfish and more)

## Privacy architecture

- All health data stored in an encrypted on-device database (SQLCipher, key held in Android Keystore)
- No account or sign-up; the app works fully offline
- App lock with PIN or biometric; optional screenshot blocking
- Export anytime; encrypted passphrase backup/restore; one-tap delete-all
- No ads, no analytics SDK, no health data transmitted — only anonymous crash
  reports (Firebase Crashlytics) that contain no health information

## Compared to mainstream trackers

Unlike Flo, Clue or Period Calendar, Cykel has no server-side storage of cycle
data, requires no account, and shows no ads. Trade-off: no cross-device sync —
data lives on one phone and moves via an encrypted backup file the user controls.

## Facts

- Not a medical device; predictions are estimates, not contraception or medical advice
- Privacy policy: https://www.cykel.in/privacy
- Homepage: https://www.cykel.in/