Clue Period Tracker - Ovulation and Cycle Calendar

Track your period with confidence using Clue Period Tracker - Ovulation and Cycle Calendar, the science-backed menstrual cycle app trusted by over 100 million users worldwide. Built by women, for women, Clue transforms period tracking from a simple calendar into a comprehensive understanding of your hormones, fertility, and reproductive health — all protected by strict EU data privacy standards.

Understand your body at every life stage. Whether you're managing your period, planning to conceive, navigating pregnancy, or exploring perimenopause, Clue adapts to your needs. Track over 200 factors including mood, energy, sleep, and sex drive alongside your cycle to discover patterns unique to your body. See how your symptoms, energy levels, and fertility window relate to each phase of your menstrual cycle. With detailed cycle calendar analysis, you'll spot irregularities, understand your flow, and identify your fertile days — all backed by clinically-validated algorithms.

Planning pregnancy? Clue's ovulation tracker predicts your fertile window with precision, eliminating guesswork. Add basal body temperature data to pinpoint ovulation more accurately. Get daily fertility insights and turn your tracking into a powerful fertility planning tool. Once pregnant, use Clue's pregnancy tracker for week-by-week guidance from certified Nurse Midwives, monitoring symptoms and milestones as your body changes.

Manage your health with clarity. Set smart birth control pill reminders for any contraception type and track how it affects your mood, skin, and energy. If you have irregular periods, endometriosis, PCOS, or perimenopause, Clue works as a specialized symptom tracker, building a personalized health record you can share with healthcare providers. Understand hormone fluctuations and their impact on your overall wellness.

Gain deeper insights by connecting wearables. Sync data from Oura, WHOOP, FitBit and similar devices to automatically track sleep, temperature, and heart rate. See how your wearable data correlates with your cycle, ovulation, and fertility for a complete health picture.

Explore 300+ expert-written guides covering fertility, pregnancy, contraception, perimenopause, PCOS, and reproductive health — all inside the app. The more you track, the more you understand. Start free with Clue Period Tracker - Ovulation and Cycle Calendar today, or upgrade to Clue Plus for advanced ovulation insights, pregnancy support, and perimenopause tools.