The brief
Cycle apps mostly stop at prediction: here is your next period, here is a calendar. HERA had to go one step further and answer the question users actually have — given where I am in my cycle, what should I do today about training, food and energy?
What we built
A cross-platform app with cycle logging, phase detection and phase-aware guidance, sitting on a Postgres backend with strict per-user data isolation — non-negotiable for health data.
Because this is sensitive data, the account layer includes full in-app account deletion that really deletes: a privileged database function removes the user and every row attached to them, which is also what the App Store now requires.
- Cycle logging with phase detection and daily guidance
- Health-grade data isolation, per user, at the database level
- In-app account deletion that hard-deletes all user data
- Separate marketing landing page and in-app web build
- iOS and Android submissions, including review corrections
The detail most builds skip
Privacy plumbing is invisible in a screenshot and decisive in review. HERA was rejected once for missing account deletion, which was designed, built and re-submitted inside the same week. Shipping means getting through that, not stopping at a beautiful build.
Stack
- React Native
- Expo
- Supabase
- Postgres
- Vercel
- App Store
- Google Play
