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.