YIMA vs Flow State Cycle

YIMA: Period Calendar is a beautifully designed, privacy-first menstrual cycle tracker built with love by the Novawerk open-source community. YOUR PRIVACY MATTERS All data is stored locally on your device. No accounts, no cloud sync, no tracking, no ads — ever. You own your data completely. SMART PREDICTIONS Record just 2-3 cycles and YIMA automatically predicts your upcoming periods, fertile windows, and cycle phases with increasing accuracy. CYCLE AT A GLANCE • Visual calendar with color-coded period days and predictions • Real-time cycle phase indicator (Menstrual, Follicular, Ovulation, Luteal) • Countdown to your next period with day-by-day tracking • Bar chart showing cycle length trends with outlier detection DAILY LOGGING • Track flow intensity (Light, Medium, Heavy) • Record your mood and symptoms • Add personal notes for each day • Backfill past periods anytime DETAILED STATISTICS • Average period and cycle length over last 6 cycles • Visual cycle comparison chart • Complete history with period and cycle data • Easily spot irregularities THOUGHTFUL DESIGN • Material Design 3 with expressive shapes and animations • Light and dark mode support • Smooth page transitions and delightful interactions • Available in English and Chinese (中文) OPEN SOURCE YIMA is built by Novawerk — open-source apps, made with care. View our code, contribute, or verify our privacy claims at github.com/Novawerk/yimalaile. This app does not provide medical advice. It is for educational and planning purposes only.

Flow State is a private, local-first period tracker that keeps your health data on your device — no account required, no cloud, no tracking. Log your period with a single tap. Flow State learns your unique cycle and predicts your next period using your own data, not assumptions. FEATURES • Smart predictions — weighted rolling average based on your cycle history, not a generic 28-day guess • Symptom and mood tracking — log cramps, headache, fatigue, mood changes, and more • Cycle insights — flow intensity patterns, symptom frequency, mood distribution, and correlations • Doctor-ready PDF report — share a clean summary with your healthcare provider • Apple Health and Google Health Connect sync — read and write menstrual data across your health ecosystem • Curated essentials — helpful products for each phase of your cycle • Dark mode — full light, dark, and system theme support • CSV export — download your complete cycle history anytime PRIVACY FIRST Your data never leaves your device. No account, no servers, no analytics, no ads. Period.