** “Clue is knowledge about your cycle, about science, about yourself.” — Apple **

Clue Period & Cycle Tracker is power over your period. Use Clue to track your cycle, predict your next period, see when you’re most fertile, and to discover how your hormonal changes affect your moods, cravings, energy levels and more. Plus, set reminders so you never get surprised by your period or cramps again.

Clue combines science, cutting-edge technology, and your data, to arm you with the knowledge that empowers you to live your life, your way.

** Rated the top free period tracker app by The Cut, New York Magazine and Refinery 29, and winner of the Best Fertility Apps of 2019 by Healthline. **

Period & Cycle Tracking:
+ Predict and know exactly when your next period is due
+ Track your period days and log your flow
+ Track pain, cramps, PMS and other related symptoms
+ Discover patterns in your menstrual cycle by tracking over 30 health categories
+ Manage your general health and well-being

Fertility & Ovulation Tracking:
+ Follow your fertile window and see when you’re ovulating
+ Log your BBT (Body Basal Temperature)—perfect if you’re trying to conceive

No more surprises:
+ Set up your own reminders, like when your next cycle is about to begin
+ Set birth control pill reminders

Your unique cycle, explained:
+ In-app information about menstrual and reproductive health
+ Charts and graphs allow you to easily view your cycle lengths and period history
+ Clue provides you with insights that can be used to help identify regularities and irregularities

Your privacy, respected and protected:
+ Password protection–for your eyes only!
+ Your data is safe and secure - Clue does NOT sell user data

Clue goes beyond adding a period to a calendar. Check out these fan-favourite features:
+ Bring Clue to your next doctor’s visit and have your period and cycle data handy
+ NO pink and NO butterflies! Just your cycle and your stats, displayed in clean designs
+ No ads. We repeat, no ads!
+ Personalised reminders: customise your notifications with all of your favourite period puns (our personal favourite: “It’s Shark Week!”)
+ Inclusive language–so you and everyone else with a cycle can feel empowered to use our app
+ Backed by science: Clue partners with world-class research institutions to provide you with the most accurate cycle predictions.

Upgrade to Clue Plus for an enhanced cycle analysis & forecasts based on what you track in the app.

1 month for £0.99
12 months for £9.99

These prices are in British Pounds (GBP). Pricing in other currencies & countries may vary & actual charges may be converted to your local currency depending on the country of residence.

After you choose one of our plans & confirm your purchase, the payment will be charged to your credit card through your iTunes Account.

Renewal: Once purchased, subscriptions will automatically renew unless auto-renew is turned off at least 24-hours before the end of the current period.

If you decide to renew your subscription, your account will be charged the same amount you paid for your initial subscription within 24-hours prior to the end of the current period. At any time you can manage your subscription & turn off auto-renewal by going to the Account Settings on your device after the purchase.

Note: Clue Period & Cycle Tracker should *not* be used as a contraceptive.

Send your feedback, questions, and suggestions to

Get answers to your questions about periods, sex, and menstrual health at – no really, check us out!

Twitter: @clue
Instagram: @clueapp

Here are our Terms of Service:
And our Privacy Policy:

What’s New

Version 5.21

Hello from Clue! Here's another update to make your period tracking even more accurate and seamless.

If you run into any trouble, let us know at

The menstrual cycle is more than just your period – it’s a complex ebb and flow of hormones that make your reproductive system function. But did you know that hormones are also crucial to countless other processes in your body? As you slam on the brakes to avoid a car collision, your adrenal glands pump out the hormone adrenaline (epinephrine) to help you act quickly. And melatonin helps to ensure you get a good night's sleep.

Read more about hormones, and everything else related to menstrual and reproductive health – at

Ratings and Reviews

4.7 out of 5
45.5K Ratings

45.5K Ratings

Magemaniac ,

Been using it for two years!

I read about Clue somewhere online during a time when my period was very irregular and decided to give it a go. The first thing that stood out to me was the logo but that aside, the predictions are pretty good for me. I mean they vary by like two days but that is good enough for me. I use this app to plan any outings or events, see when my skin will break out, when my mood is gonna go down and such. There is a cycle presentation of the data as well as a calendar format. Great for tracking it all and you can even create custom tags. This app also helped me figure out that the acne I get around my mouth is hormonal. It also helped me figure out that the reason I skip a month during summer around May is because of the stress I go through for my exams. It’s simple to use and the predictions are quite good. I’ve recommended it to my friends and they love it as well. After this, I find other tracking apps very complicated to use. It’s simple, accurate enough and discreet enough to fool anyone into thinking it’s a game app. Easily the best period tracking app out there, highly recommended.

Franshep08 ,

Absolutely great (but, like anything, you can’t rely on it 100%)

**worth the read** So I’ve used this app for a year or so now and it’s a great thing to have to help you track both your cycle and other features such as exercise, weight gain/loss and other habits and how you’re feeling each day. I use it regularly and it is very useful, I haven’t downloaded an other app for this purpose so I can’t compare it to others but i can easily track both mine and my friends’ data on this app which is good.
Hoooooowever...just bear in mind that the app, arguably like every other app for this purpose, will not be 100% reliable, and so even though this advanced technology seems like it is extremely accurate, you should always be prepared just in case your cycle is a little earlier than expected (a mistake easily made if the app told you your cycle would only start when you got back home from holiday, when in fact you were caught by surprise in the last few days of your holiday, for instance). Everybody’s body is different and so many reviews will say that Clue has never been inaccurate for them regarding their cycle, however this may not be the case for most people.
Hope this helped, and overall a very useful app to have at all times 👍🏻

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 😂


BioWink GmbH
162.2 MB
Health & Fitness

Requires iOS 10.0 or later. Compatible with iPhone, iPad and iPod touch.


English, Danish, French, German, Hindi, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Traditional Chinese, Turkish

Age Rating
Rated 12+ for the following:
Infrequent/Mild Mature/Suggestive Themes
Infrequent/Mild Medical/Treatment Information
© BioWink GmbH
In-App Purchases
  1. 1 Month £0.99
  2. 12 Months £9.99
  3. 1 Month £9.99


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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