Clay — Period Tracker & Cycle Predictor

The smartest period tracker that learns your unique cycle. Clay uses a machine learning algorithm to predict your next period date, track ovulation, and provide personalized health tips based on your cycle phase.

★ ACCURATE PERIOD PREDICTIONS
Clay doesn't assume a fixed 28-day cycle. Our adaptive algorithm analyzes your cycle history and lifestyle factors to deliver predictions that get more accurate every month. Track your prediction success rate right in the app.

★ OVULATION & FERTILE WINDOW TRACKER
Know exactly when you're ovulating. Clay calculates your fertile window and ovulation date based on your personal cycle data — not generic averages.

★ LIFESTYLE-AWARE CYCLE TRACKING
Your period is affected by your daily life. Clay factors in:
• Stress levels
• Sleep duration & regularity
• Work hours & shift patterns
• Exercise & hydration
• Caffeine intake
• Travel & jet lag

See exactly which factors are delaying or advancing your period with the built-in impact breakdown.

★ CYCLE PHASE HEALTH TIPS
Get daily health tips tailored to your current phase — menstrual, follicular, ovulation, or luteal. Know what to eat, how to exercise, and how to feel your best throughout your cycle.

★ BEAUTIFUL CYCLE GRAPH
Visualize your cycle trends over 3, 6, or 12 months. Compare actual dates against moving average and predicted dates on an interactive scrollable chart.

★ 100% PRIVATE — NO ACCOUNT NEEDED
All data stays on your device. No sign-up, no cloud sync, no data collection. Your menstrual health data is never shared with anyone.

★ QUICK SETUP
Answer 3 simple questions and start tracking immediately. No lengthy onboarding or complicated setup.

PERFECT FOR:
• Women tracking irregular periods
• Anyone with PCOS, endometriosis, or thyroid conditions
• Cycle-aware fitness and nutrition planning
• Ovulation awareness and fertile window tracking
• Understanding how lifestyle affects your menstrual cycle

Clay is not a medical device and does not provide medical advice. Predictions are estimates based on your personal data and should not be used as contraception.

Download Clay — the period tracker that actually learns your body.