Most period apps either paywall basic features or collect a lot of very personal health data. I wanted the opposite, so I built Flow State Cycle. What it does: - One tap to log a day. It saves instantly, with no save button - Predictions come from a weighted average of your own cycles, not a hardcoded 28 days, and it shows how confident it is - CSV export + a PDF report you can bring to a doctor - Optional Apple Health sync What it doesn't do: - No account or sign-up. All data stays in local storage on the device - No ads, no analytics, no in-app purchases - Anonymous crash reports (no health data) are on by default, and you can turn them off in Settings Stack: Expo / React Native, Zustand + AsyncStorage, no server at all. Just shipped support for the iPhone Duo foldable. iOS: https://apps.apple.com/app/id6762103850 Android is in closed testing. I'd love honest feedback, especially on onboarding and whether the predictions feel trustworthy.   submitted by   /u/RedditEasty [link]   [comments]