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Natural Cycles, Birth Control

By NaturalCycles Nordic AB

This app is only available on the App Store for iOS devices.


Natural Cycles helps you keep track of your ovulation, period and fertility. The app will show you when to use protection to effectively prevent a pregnancy. It is clinically tested to be 99.5% effective*.

*Natural Cycles has a method failure Pearl Index of 0.5, which means that 5 women out of 1000 get pregnant during one year due to a falsely attributed green day. Natural Cycles has a typical-use Pearl Index of 7.0, which means that in total 7 women out of 100 get pregnant during one year due to all possible reasons (e.g. having unprotected sex on red days, failure of the contraceptive method used on red days).

Natural Cycles analyses your temperature, period and ovulation to calculate when you are fertile and should use birth control (e.g. condoms). Our algorithm is the brains behind the app. It takes care of all the complex calculations and tells you everything you need to know about your cycle.

How it works:

Measure your temperature first thing in the morning before you get out of bed. You will need a two decimal basal thermometer to do so. Enter your measurement and other data such as period, sex and LH test results into the app. A green day means you are not fertile. A red day means that you are likely to be fertile and you should use protection.

Make sure to read the instructions of use before you get started. For the app to effectively work as a birth control, you should be comfortable with using protection such as condoms on red days.

In the beginning, the app will be getting to know your unique cycle, so you will have more red days - this is to ensure effectiveness. Once you’ve measured for a while you can get as little as 8 red days in one cycle.

Natural Cycles does not protect against sexually transmitted diseases (STDs).

Planning a pregnancy:

Natural Cycles goes beyond birth control. Our ‘Plan a pregnancy’ mode lets you know when you are most fertile and time your sex to increase your chances of conceiving.

The app will let you know when it’s best to take a pregnancy test. Once a positive test is entered into the app, it switches colours and your features change. You will now be able to track the development of your pregnancy. You can easily switch back to "Prevent".


- Red and green days to tell you exactly when you should use protection.
- Ovulation calculator and detector
- Intuitive data entry – temperature, ovulation test results, period
- Interactive calendar showing your current and upcoming fertility status
- Personalised fertility predictions up to 5 cycles in advance
- Informative graph view
- Statistics from your cycles and fertility
- Integration with Apple Health app

‘Plan a pregnancy’ mode:
- Personal fertility scale to pinpoint the optimal days to conceive
- Pregnancy detector
- Information about your baby’s development


Natural Cycles includes In App purchases for the auto-renewable subscription to the application. After a free trial, the user can choose to pay a monthly fee of 9.99 USD or a yearly fee of 79.99 USD. If the users chooses to pay for a year directly, before the end of the free trial, a basal thermometer is included in the price. Payment will be charged to iTunes Account at confirmation of purchase. Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. The account will then be charged for renewal within 24-hours prior to the end of the current period at the price described above. Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase. No cancellation of the current subscription is allowed during active subscription period.

Our Privacy Policy and Terms of Use can be viewed here:

Natural Cycles is only certified for contraception in Europe. In the US, Natural Cycles is intended to be used for fertility monitoring.

What's New in Version 2.9.4

We are very proud of this update! Except for smaller improvements this new app version has:
- The algorithm has improved and now finds ovulation with 10% higher precision than before, yay!
- The time you've spent on either Plan or Prevent will now stay in Plan or Prevent for past days in the app. So when you switch between the two modes, only today and the future will reflect the change.
- The predicted days in the app now has a new nice design that makes it easier to distinguish from past days.
- The month view now shows 5 full predicted cycles and smarter predictions in general that change over time


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Customer Reviews

Answer to my prayers!

Okay that may be a bit dramatic...but seriously it is how I feel about this app. I've only recently become sexually active and my friends were like you better go on the pill. And I've honestly always been pressure and questioned for not going on the pill. Yes my period is not my favorite thing but I feel like it's my body doing it's thing. And I really only have one maybe two days of discomfort so messing with my body natural chemicals just weirded me out. Not knocking anyone who uses birth control the female body has such a variety that I think it's important to do what's best for you. And there is an option if you are on birth control for this app. It really is for any woman!

So I love this app. The notifications are so helpful and after my free month trial I will be signing up for the year. I like that I will be able to track and get to know my body even more because the bleeding part of our period is only the beginning of our cycle and there is so much more to learn and discover from our bodies.

Keep up the good work Natural Cycle!

Happy doesn’t cover it

I’m thrilled to have found this app! I ran across it in a random Facebook article about a month before it was accepted by the US and waited impatiently for it to be approved! I’m allergic to birth control, literally, I get very sick and not to be TMI but on it I’m constantly dealing with yeast infection issues and migraines.
I couldn’t afford the yearly price of the app so I did month to month and picked up a basal thermometer from target for $8. The app is so easy to use! Put your thermometer on your phone and grab it when your alarm goes off. I’m a single mom, I’m incredibly busy, and having something that makes life easier is a blessing. Natural cycles is that for me. I’m keeping track of my bodies rhythms and knowing when my courses are coming without chemicals or tons of time. One minute to take your temp, one minute to enter it and read up on where you are, done! It doesn’t get easier. I’m thrilled!

Life Changer.

This app has literally changed my life. I've been on everything from the patch (I gained weight), to every pill they make (they ALL made me suicidal and crazy), to the shot (worked for a while, but last time gave me a LOT of trouble with hormones, vaginal dryness and pain, low libido, etc. and took nearly two years to recover from its effects.) and everything else I do in life is as natural as possible anyway so this is perfect for me. So far, it's been so nice to know exactly where I'm at in my cycle, to analyze my natural hormones, and have the freedom of not using contraception when it isn't necessary. I don't know why anyone would want to take any type of birth control when this is a no-brainer.

Natural Cycles, Birth Control
View in iTunes
This app is designed for both iPhone and iPad
Offers Apple Watch App for iPhone
  • Free
  • Category: Health & Fitness
  • Updated:
  • Version: 2.9.4
  • Size: 36.3 MB
  • Apple Watch: Yes
  • Language: English
  • Seller:
Rated 12+ for the following:
  • Infrequent/Mild Sexual Content and Nudity
  • Infrequent/Mild Medical/Treatment Information

Compatibility: Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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Top In-App Purchases

  1. Natural Cycles monthly plan$9.99
  2. Natural Cycles yearly plan$79.99