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.