Clue Period Tracker & Calendar

1.25M reviews
Content rating
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About this app

Clue is the period tracker and fertility app that puts the power of science and the support of fertility experts in your own hands.

Whether you’re trying to get pregnant, tracking cycle-related experiences, or navigating the changes of menopause, Clue’s got you covered. Understand your body and start living in sync with your cycle, instead of in spite of it, with Clue. Discover patterns in your menstrual cycle, access expert advice for things like your birth control, and fertility questions, get pregnant faster, and track your developing pregnancy, all in one easy-to-use app. Clue is more than a period diary. It’s an ovulation tracker, period, and pregnancy calendar ready to guide you through all your cycle’s stages. For life.

Founded and led by women, Clue is safe and inclusive cycle tracker, and one of the only period apps entirely based on science. You can trust Clue as your period calendar, ovulation tracker, and fertility friend.

🔒 More than 11 million people trust Clue with their period, pregnancy, and cycle data

🇪🇺 Your health data is kept safe within the EU and will never be disclosed or shared

5 reasons Clue is your easy-to-use fertility and menstrual cycle tracker:

✓ Set period reminders to be prepared for your next cycle
✓ Plan around your period, ovulation, and fertile days with a menstrual calendar
✓ Keep track of your contraception and birth control pill
✓ Learn the science behind your cycle with health articles that span sex, PCOS, fertility, and pregnancy, written by Clue’s in-house Science Team.
✓ Get pregnant faster with targeted ovulation predictions and a daily fertility tracker


Clue Period Tracking empowers you to become the expert on your own body, with 100+ cycle tracking categories for things like your birth control, ovulation pain, PMS, and menstrual flow.

Learn how your cycle affects things like your mood, skin, energy level, sleep, exercise, and sex life, and get a heads up from Clue when you’re tracking experiences that are outside of what’s typical for you. If you have irregular periods you can also use Clue as your irregular period tracker.

The more you track, the better Clue can pinpoint your future period dates, identify patterns in your cycle, and provide you with valuable insights on your unique menstrual cycle to discuss with your OB/GYN for more effective care.


Trying to conceive? Clue has helped millions of people plan pregnancy. Track ovulation easily, without temperature checks, and get accurate fertility predictions. Log pregnancy and ovulation tests, and plan around your most fertile days to increase your chances of getting pregnant.


Pregnancy tracking categories and pregnancy week-by-week guidance. Set your due date countdown with a pregnancy calculator, and learn what to expect with weekly pregnancy highlights, including tips and suggestions from Certified Nurse Midwives.


Understand changes as your body transitions to menopause (a time known as perimenopause). Track hot flashes and other menopausal symptoms, and get support with science-based health articles.

A subscription to Clue Plus grants you all-in access to Clue Period Tracking, your personal ovulation calculator, and pregnancy app features.

What’s in Clue Plus?
✓ 12 months of advanced ovulation, fertile day, and period predictions
✓ Clue Conceive, a fertility and ovulation tracker to help you get pregnant faster
✓ Tips, advice, and expert answers to your reproductive health questions
✓ Clue Pregnancy Mode for a week-by-week pregnancy calendar
✓ Clue Menopause Tracker

Note: Clue should *not* be used as a contraceptive.

Looking for a period tracker and ovulation app backed by science, created by experts, and with no-nonsense, frills, and flowers? Then Clue is for you.
Updated on
Feb 29, 2024

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
This app may share these data types with third parties
Personal info, Health and fitness and 2 others
This app may collect these data types
Personal info, Health and fitness and 3 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

1.23M reviews
February 12, 2024
I've used this app for at least 8 years now and I'm really disappointed by it. The app won't function at all and is a black screen when trying to open it, even after uninstalling and reinstalling. In the rare times that it does work, all the updates have made it clunky and less usable while they have restricted many things behind a paywall. While that can be ok, the app fails at doing the bare minimum function when it fails to even function when it was so much better when it was first released.
64 people found this review helpful
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Debra Babineaux
February 22, 2024
ive been using Clue since before the overhaul so my expectations of the app are different. as-is, the app is fine. it works well and you can track your period. but without premium, you can't track any symptoms other than mood, energy levels, pms, or digestion. so if you have chronic conditions, you can't track how they might interact with your cycle. if you don't need all of that, or can afford premium, then it works fine. if you don't get premium, there's a ton of popups and a permanent banner.
51 people found this review helpful
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Clue Period Tracker by BioWink
February 23, 2024
Hey, thanks for your review. We introduced Clue Plus to bring even more value to the services we provide. To keep adding benefits, we need to be financially sustainable. We don’t want to show ads nor sell your data, so the only way to be sustainable is by introducing paid features. All the best, Anna from Clue.
Krystal Miller
March 1, 2024
I have used this app for over 10yrs at this point and I still love it. It has only gotten better throughout the years, I just wish they would do better about the Clue+ ads. They have gotten really annoying and little obsessive. Definitely understand that they need funding, but I am of the select few that does not benefit any from the extras.
1 person found this review helpful
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Clue Period Tracker by BioWink
March 4, 2024
Hey, thanks for taking the time to share your positive feedback with us–it means a lot! Happy tracking from all of us in Berlin. All the best, the Support Team at Clue.