01
The problem
People who menstruate need a reliable way to track cycles, predict periods and understand symptoms — but many cycle apps require accounts, sync intimate health data to servers, or handle irregular cycles poorly.
Health & Fitness
Period Cycle Tracker: HerCycle
Private period tracker, menstrual calendar and ovulation companion that works fully offline.
Overview
02
The solution
HerCycle is a privacy-first period tracker: menstrual cycle logging with an adaptive irregular-cycle algorithm, ovulation and fertile-window estimates, PMS/symptom/mood logging with health reports, and reminders — all stored on-device, account-free and fully offline, with a clear medical disclaimer that estimates are not medical advice.
My contribution
- 01
Built the period and cycle logging flow with a visual menstrual calendar, flow tracking and next-period countdowns.
- 02
Implemented the irregular-cycle engine that adapts predictions to cycle variations, plus ovulation and fertile-window estimates with BBT, cervical mucus and pregnancy due-date inputs.
- 03
Developed symptom, PMS and mood logging with cycle health reports users can share with their doctor.
- 04
Engineered the privacy-first architecture: on-device storage, no registration, offline-first, with PIN/biometric app lock.
Interface showcase
Key metrics
- Platform
- Android
- Category
- Health & Fitness
Tech stack
Frontend
- Flutter
- Dart
Backend
- On-device Storage
Other
- Play Store Console
- ASO
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