Know your body like never before with the period tracker and ovulation calculator you can trust. Clue is the #1 women-led period and cycle tracker created by women to transform menstrual cycle tracking into a deep understanding of your hormones and reproductive health.

Clue helps you make sense of your menstrual cycle at every life stage – track your period, fertility, ovulation, and pregnancy with the cycle tracker backed by science and protected by strict EU data privacy law. Explore 300+ expert-written guides on menstrual cycles, fertility, pregnancy and more, all inside the app. The more you track, the more you know.

Women-led, science-based, privacy-first period tracker 🔒

Free period tracker with calendar view to plan with confidence

• See when your period is coming with Clue's period calendar.
• Use Clue as an ovulation calculator to follow your fertile days.
• Track your period alongside over 200 factors like mood, energy, sleep, and sex drive to see how they relate to your menstrual cycle.
• Spot patterns in your menstrual cycle regularity and period flow.
• Get birth control pill reminders and notifications when your period is due.
• Get alerts when you enter a new menstrual cycle phase.
• Clue works as a period tracker for teens and anyone wanting body literacy at any stage.

Ovulation calculator and fertility tracker for trying to get pregnant

• Clue's ovulation tracker predicts your fertile window with a clinically validated algorithm – no ovulation strips, no guesswork.
• Get daily fertility insights for trying to get pregnant.
• Add basal body temperature (BBT) to pinpoint ovulation with more accuracy.
• Turn your cycle tracker app into a powerful ovulation calculator and tool for trying to get pregnant.

Track your pregnancy week-by-week with expert guidance

• Clue's pregnancy tracker guides you through every stage of pregnancy with advice from certified Nurse Midwives.
• Monitor pregnancy symptoms, milestones, and body changes with personalized insights.
• Use Clue before, during, and after pregnancy as your complete pregnancy tracker.

Never miss birth control with smart pill reminders

• Set birth control pill reminders for all kinds of contraception – Clue works as your birth control tracker.
• Track how birth control affects your mood, energy, skin, and symptoms throughout your menstrual cycle.

Understand irregular periods, perimenopause and health conditions

• Clue works as an irregular period tracker, giving you predictions even with irregularities.
• Use Clue as an endometriosis or PCOS tracker to monitor symptoms and build a personalized health record.
• Perimenopause tracker helps you navigate hormonal shifts and changing cycles.
• Use Clue as a hormone tracker to understand how fluctuations affect mood, skin, and overall health.

Connect a wearable for deeper fertility and cycle tracking

• Sync Oura, WHOOP, FitBit and more to automatically track sleep, temperature, and heart rate.
• Use Clue Cycle & Period Tracker and your wearable as a basal body temperature tracker and heart rate tracker.
• See how wearable data relates to your menstrual cycle and ovulation for a fuller picture of your health.

Note: Clue period tracker and ovulation tracker should not be used as a form of contraception.

Visit support.helloclue.com for help and resources.

Join over 100M people using Clue – download Clue to start tracking your period and cycle today. 📲 Subscribe to Clue Plus for deeper insights, advanced ovulation tracking, pregnancy support, and perimenopause tools.