AI-Powered Cycle Intelligence
Decode your cycle
Period tracking that learns with you. Predictions that sharpen over time. Insights that actually understand your body.
Features
Built around how your body actually works
Six intelligently designed tools that turn raw data into cycle literacy. No guesswork. No pink-washed nonsense.
Smart Tracking
Log periods, symptoms, moods, and daily health. Auto-calculated cycle lengths with color-coded calendar phases.
AI Insights
Chat with an assistant that knows your cycle. Context-aware responses tailored to your current phase and history.
Predictions
Weighted moving averages that sharpen with every cycle. Fertile windows, ovulation, and phase detection that improves over time.
Cycle Phases
Menstrual, follicular, ovulation, luteal — know exactly where you are and what to expect next.
Pattern Recognition
Regularity scoring, historical trends, and symptom correlations visualized in elegant, actionable charts.
Quick Logging
Minimal taps to log your day. Built for the moments when you just need to record and move on.
Your body.
Your data.
Period.
Crimson works fully offline. Your cycle data stays on your device. Cloud sync is optional and encrypted end-to-end. We never sell, share, or monetize your health data.
Start understanding your cycle
Free to use. Private by default. Intelligence that grows with you.