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Clue is more than just a period tracker – it’s an award-winning and science-packed menstrual health app that helps you decode and understand your entire cycle and reproductive health, from first period to last.

Go beyond dates in a calendar and dive deep into your body’s unique rhythm. Track 200+ cycle-related experiences to uncover patterns and identify how they impact your energy, emotions, sex drive, mental health, fertility, and more.

Whether it’s period tracking, trying to conceive, pregnancy tracking, or wanting a better understanding of how your body changes during perimenopause, you can customize Clue to reach your personal health goals.

Over 650 million cycles have been tracked in Clue. Here’s why so many people around the world trust Clue as their period and ovulation tracker:

Track 200+ data points: From mood and sleep to sex drive and energy levels, Clue helps you uncover the connections between your menstrual cycle, fertility, hormones, and overall well-being, powered by science.

Smarter predictions: Clue’s algorithm learns from your data, providing you with accurate, personalized predictions for your period, PMS, and ovulation, so you can make plans with confidence.

Deeper cycle insights: Sensing a trend in your mood or energy levels but can’t quite put your finger on it? Uncover patterns in your fertility, menstrual bleeding, and physical and mental health with detailed charts and graphs.

Break the cycle of discomfort: Identify patterns related to PMS, cramps, and other experiences so you can take proactive steps to manage them. Stay up-to-date when your periods become irregular or when it might be time to talk to your healthcare provider.

Medical-grade fertility tracker: Clue Conceive’s clinically-tested technology and CE-marked algorithm can pinpoint your ovulation and fertile window, without the hassle of temperature tracking or pee tests, to help you get pregnant faster.

Driven by science: Get reliable answers to questions about your cycle, sex, and fertility with a library of 100+ evidence-based articles written by Clue’s in-house Science Team of experts.

Data privacy you can trust: With Clue, your health data will never be sold or shared. Period. Clue is based in Germany, which means your data is under the jurisdiction of the world’s strictest data privacy protections (the EU GDPR 🇪🇺🔒).

Customize Clue to be your ideal ovulation tracker, so you can understand your full cycle intelligence and get a science-driven picture of your body’s inner workings, with these additional features:

✓ Period, fertility, and birth control pill reminders
✓ Clue Connect: a way to share your cycle phases, including your period, PMS, and fertile window with a partner
✓ Daily notes: add extra details to make your tracking more complete and personalized
✓ Interactive menstrual calendar and period calendar so you can plan smarter
✓ Sleep analysis to understand how your sleep changes throughout your cycle
✓ Pregnancy tracker with weekly highlights and tips from certified Nurse Midwives
✓ Perimenopause support, info, and a perimenopause tracker
✓ Safe and secure cycle tracker and period tracker for teens
✓ Irregular period tracker with helpful tips for managing health conditions including PCOS, irregular cycles, and endometriosis
✓ Basal body temperature tracking and BBT charts

Clue is proud to collaborate with more than 7 research publications and 29 research partnerships, including researchers from Harvard, MIT, and UC Berkeley. Learn more about how you can contribute to research just by tracking, in the About Clue section of the Content Tab.

Note: Clue Period and Ovulation Tracker should *not* be used as a contraceptive.

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Subscribe to Clue Plus for access to all premium features like Clue Plus Period Tracking, your personal ovulation calculator, Clue Conceive, and Clue pregnancy app features.