Clue Period, Ovulation Tracker 12+

Fertility & Cycle Calendar

BioWink GmbH

    • Free
    • Offers In-App Purchases

iPhone Screenshots


Get to know your menstrual cycle with the award-winning Clue app. Clue makes it easy to stay in sync with your body and track your period, fertility, and cycle-related experiences accurately and effortlessly.

Whether you’re trying to get pregnant, tracking cycle-related experiences, or navigating the changes of perimenopause, Clue’s got you covered.

Backed by science and founded and led by women, Clue is trusted by millions of people worldwide. Thanks to our Berlin headquarters, your data with Clue is protected by some of the strictest data privacy laws in the world (GDPR). Your health data will never be sold or disclosed. No matter where you live.

What can Clue do for you?


Clue Period Tracking empowers you to become the expert of your unique body.

• Know when to expect your period and plan ahead with advanced, personalized predictions
• Discover your body’s unique patterns by tracking 100+ experiences connected to your cycle like feelings, PMS, cravings, pain, sex drive, and much more
• Review an analysis of your past periods and cycles, including average cycle length, period length, period flow, and cycle variation
• Log your birth control method, including pills, IUD, ring, patch, and more
• Set up calendar reminders for your period
• Add a widget to your home screen so you can see your current cycle and know when your period is predicted to start
• Sync your period data with Apple Health
• Get answers to your health questions with science-based content that breaks down complicated topics like fertility, STIs, and the science of sex into easy-to-understand articles


Clue’s clinically-tested technology takes the mystery out of getting pregnant and can easily tell you your most fertile days.

• Get personalized ovulation and fertility predictions for the best time to try or do home insemination
• Access tips and advice from fertility experts to help you understand the science behind getting pregnant


• Follow the growth of your baby with weekly updates on size, weight, and development
• Track your body's changes during pregnancy, like increased smell and taste, pregnancy glow, sleep quality, the supplements you take, and more
• Receive weekly tips and support from OB-GYNs and Nurse Midwives


Get support throughout your transition to menopause (a time known as perimenopause)

• Track hot flashes, sleep changes, your mood, and more
• Stay on top of your changing cycle
• Learn how your body is changing with expert-led articles

Get the most out of Clue, plus access to all four tracking modes (like Clue Conceive and Clue Pregnancy), with a Clue Plus subscription!

A few legal details:

After you choose the Clue subscription that’s right for you & confirm your purchase, the credit card associated with your iTunes Account will be charged. Once purchased, your subscription will automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. If you currently have a free trial, any unused time will be forfeited when you purchase a subscription.

If you want to renew your subscription, your account will be charged the same amount you paid for your initial subscription, 24 hours before the end of the current period. You can manage or change your subscription at any time, including turning off auto-renewal, by going to the ‘Account Settings’ on your device after the purchase.

Note: Clue should *not* be used as a contraceptive. Clue is made to help people understand their menstrual and reproductive health by tracking their data, as well as predicting fertile days to aid conception. The app does not substitute professional medical advice, diagnosis, or treatment. Your healthcare provider can give you advice on your specific needs and situation.

Terms of Service:
Privacy Policy:

What’s New

Version 134.0

Thanks for using Clue. This update includes bug fixes and performance enhancements.

If you're enjoying the app, feel free to leave us a rating and review.

Ratings and Reviews

4.7 out of 5
98.8K Ratings

98.8K Ratings

LauraShroppy ,

So reliable (worth a read)

So after using the clue app over a period of 21 months I find that the clue app is one of my go to apps. I’m the type of girl that stresses over scheduling events around my period. I find it a very uncomfortable week and tend to hide away. At first the clue app isn’t 100% accurate but that is because it isn’t psychic. It’s important to constantly put as much information into it as you can to allow it to become accurate and gain a better understanding of your cycle. After a few months of using the app, I could rely so much on the dates it told me I was going to come on, I was super prepared and it’s always right or 1 day different. I find that my periods are quite heavy and I tend to get a lot of pain. I used the app to show the doctor days from past months to pinpoint as all my information is there, even from the littlest detail of if I was craving chocolate on 17th June 2017 😂. I recommend this to everyone. Try it and my advice, stick to it. The longer and more frequently you use it the better it gets. It knows me more than I know me! I love my period calendar 😂

LarkspurDreamer ,

Good but removed useful features in latest update

I do like using this app and find it works great for me at tracking my period. I don’t mind the new update too much, though I wasn’t using any custom tags/for anything other than period tracking. It is a bit annoying to not be able to swap between days as quickly as you used to, but I’m sure I’ll get used to it in time. I do quite like the new look of the main feature for period tracking, as well as the analysis tab and calendar.
One issue I do have with this update is that it removed the explanations from the tracking categories. For example, under the discharge category it has different options such as creamy or sticky, and on the older version you would be able to read a bit about discharge and it would give an example/descriptor of each option. This descriptor applied to literally every option on the app, and I found it so useful to double check and confirm that I was entering the correct information. I do really hope this is added again to the app, as it really helps making sure my periods are tagged correctly.
Overall it is a good app, especially with how you don’t have to pay a subscription unless you want access to the journals (which do look fascinating, and if I could afford to I probably would subscribe!), but there are features that have been removed in the recent update that I really believe should be added back in.

Developer Response ,

Hey, thanks so much for your feedback. We really appreciate you taking the time to write such a thoughtful review. As we're aiming to constantly improve the experience, we've passed you feedback now to the rest of our team. We’re really excited about what’s coming up in the future for Clue–and we hope you are too. All the best, Anna from Clue.

Gdxph ,

ruined a perfectly good cycle tracker

I never write reviews, but this update has left me frustrated and disappointed. The new update has removed any reason to log anything. Cannot view anything in analysis. Can’t see your own tags. No temperature chart so what’s the point in logging? Can’t use it offline. Doesn’t work with dynamic text so doesn’t fit on screen if you need larger text. Why only part roll out updates so we are waiting in the meantime while not letting us know what we are waiting for? I’ve had to change apps, i no longer recommend it to the women i work with in women’s health. And if you want to be inclusive please remember we’re all going to get to peri-menopause and might be there for a good ten years and weirdly that just isn’t taken into account. Was completely happy with it from at least 2015, now completely useless and i might just hate it. Please let us go back to the old functional version while you work this out in the background. UPDATE in response to the generic response - why release an unfinished update when it leaves the app unusable? Tracking my cycle is a daily affair but i’ve already lost several months waiting for the next release so i’ve had to find another app. How much longer before the final fully functional release is available? And will it do the things we came to rely on before? I would be quite happy to be able to go back to the old version until this ‘update’ is sorted, but until then I have to go elsewhere.

Developer Response ,

Hey, thanks for your feedback. We feel you. We’re sorry the latest update isn’t what you were expecting. This update was based on feedback from our community and is still rolling out in phases. We are confident that the next phases of the rollout will bring you the value you deserve. Thank you for your patience. All the best, Suzon from Clue.


App Privacy

The developer, BioWink GmbH, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Identifiers

Data Linked to You

The following data may be collected and linked to your identity:

  • Health & Fitness
  • Location
  • Contact Info
  • User Content
  • Identifiers
  • Usage Data
  • Sensitive Info

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary based on, for example, the features you use or your age. Learn More

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