YIMA: Period Tracking

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.