Know Your Fertile Days
Track your cycle, predict ovulation, and understand your body better. Simple, private, and accurate.
Everything You Need
Cycle Calendar
Visual calendar showing your cycle at a glance
Fertile Window
Know your most fertile days for conception
Ovulation Prediction
Accurate ovulation day prediction
Symptom Logging
Track flow, mood, temperature, and more
Period Prediction
Know when your next period is coming
100% Private
Data stays on your device, never uploaded
How It Works
Log Your Period
Simply tap to log when your period starts and ends
Track Daily
Optionally log symptoms, temperature, and cervical mucus for better accuracy
See Predictions
The app calculates your fertile window and next period automatically
Understanding Your Cycle
Menstrual Phase (Days 1-5)
Your period. The uterine lining sheds.
Follicular Phase (Days 6-14)
Eggs develop. Energy and mood typically improve.
Ovulation (Day 14)
Egg is released. Peak fertility window (5 days before to 1 day after).
Luteal Phase (Days 15-28)
Body prepares for possible pregnancy. PMS symptoms may occur.
Start Understanding Your Body
Free, private, and no account required.
Open Fertility TrackerGet Cycle Tips
Sign up for tips on cycle health and fertility
Note: This app is for informational purposes only and should not be used as a contraceptive method. Predictions are based on averages and your actual cycle may vary. Consult a healthcare provider for medical advice.