Natural Cycles, Birth Control

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.

Natural Cycles, Birth Control App Description & Overview

The applications Natural Cycles, Birth Control was published in the category Health & Fitness on 2013-12-17 and was developed by NaturalCycles Nordic AB. The file size is 34.59 MB. The current version is 2.9.4 and works well on 8.0 and high ios versions.

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

Natural Cycles, Birth Control App Tips & Tricks

Natural Cycles, Birth Control Reviews


Good app but problems with iOS 11  evolutionkakumei  4 star

App works well but there are some UI oddities with my iPhone SE since installing iOS 11. Apart from that I do wish the thermometer that you ship with the subscription would have a backlight for the LCD as I have to leave the bedroom so as to not disturb my spouse to gain enough light to see the results. Also, the built in app help should be more detailed and it should also provide a legend for all the symbols and icons.


Good app  rpallapati  4 star

Expensive though!


Hormone-free & happy!  jtmarble  5 star

Love it! Game changer! Very user friendly!


👍  ITConsultantSeattle  5 star

The app is fantastic. Yes, you can do the same thing with a chart, but that's definitely for someone more organised than me. I have slightly irregular cycle and the app worked perfect with predictions so far. I also have a peace of mind that I have ovulations - I recently quit birth control for the second time (tons of added risk of breast cancer and blood clotting) and it's a relief to know they already returned.


LOVE IT!!  Warpedtour2013  5 star

I absolutely love this app! It's really easy to use and it's very accurate so far especially for only one month of tracking. It pinpointed my ovulation and my period start date on point. For a person who has been on hormonal birth control before, I feel so much better know I have no more side effects to deal with and I am in control of my fertile and non fertile days. Birth control just wasn't for me, it affected me very negatively. I definitely recommend this for girls who have trouble with Hormonal birth control!


Amazing  WGsMama  5 star

This app is just what I've been looking for! A completely natural form of birth control, easy to use. Amazing!!


Amazing  ad1080  5 star

Life changer.


Easy and helpful!  AmyLor1  5 star

I love to study my statistics and graphs...I love knowing what my body is doing.

Heavy flyer

Love it  Heavy flyer  5 star

Easy to use and understand. My schedule is not normal but it appears to be able to run the numbers


1 month really?  Ajessen  1 star

Trying to have another baby or prevent one on this site/program says it's the best? Yes if you pay 80.00 for a year. How can you pay that with 1 month free subscription and not 3 free? Not happy with 1 month will not pay 80 dollars or pass go. No matter how much We like it we need more time. Seems to me they are money hungry?! Ugh I like fertility friend better I can keep it for years and it still works.


Leyla Alvarez fleccocopne1970 3 star

@alx_macleod: AI has 99% effectiveness for contraceptive! #IETCentralLondonNetwork @elledeebee @IETCommunities


[email protected] JerryCockrell13 3 star

@iamwellandgood: This app might help you get off the pill once and for all:


Jody Wingert LMT WingertLmt 3 star

@iamwellandgood: This app might help you get off the pill once and for all:


The best method.  Mayara.gc  5 star

Very reliable, I'm surprised with this app. It not only helps you to prevent pregnancy but helps you to know more about your body. I'm happy with this.

Mak S.

Every Women Should Do This!  Mak S.  5 star

This app helps women to understand their natural body chemistry. Too long have we depended on hormone packed alternatives to birth control. Enough! This app allows you to take back the power and live your life naturally.

Aimee baker

Highly recommend!!!  Aimee baker  5 star

I wish they had a thermometer that synced with the app it's so hard trying to see the temp first thing in the morning when I'm tired. That's my only complaint and really that's more of a thermometer than app issue


Amazing!  CarrieGlass  5 star

This app is fantastic! I highly recommend it!


My 1st cycle  @zeezee  5 star

This is my first time using this app but it really good love natural the way the app track my fertility and period but needs more improvement on the calculation for ovulation


Master your fertility!  Kimichelle1088  5 star

i suffered horribly from migraines and after some research found that it may be due to my hormonal contraception. This app has made getting off the pill a dream! not only that but my fiancé and i are planning to start a family next year after our wedding... this level of understanding on how to prevent pregnancy now will make it so easy for us to put a lot of intention into conceiving when the time comes. LOVE this app! could not recommend it more!


Birth control of the future  YayMuffins  5 star

I have never rated an app before, but I love this so much that I can't shut up about it. I've told all my friends, I've raved on social media, what more can I say? Everyone needs to be using Natural Cycles! It is so easy, and yet so effective, so amazing. I paid full price, and it was worth every penny. Natural Cycles has changed my life.


Love it!  abulotovich  5 star

It's been two months and I love this app. So glad I made the switch from hormonal birth control!


Love this app  coleam93  5 star

Such a well made software. I feel so good about my body and for the first time I feel like I actually understand it! I've felt like my cycle was out of my control my entire life but now I feel like I have the reigns for the first time. My partner and I feel great knowing that we use this app and it's been a huge source of relief for us.


Pretty life-changing  kg1237  5 star

I have been birth control for nearly 15 years of my life and despite doctors wanting me to stay on it to regulate my period, I stopped to try NaturalCycles and am glad I did. I'm been using it for five months and it's so amazing to know exactly when I'm ovulating with LH tests and temperatures. And to know I can get my period every month without some pill. It's quite empowering and I hope this app gets much more press as it should way more mainstream than it is. Only recommendation is to have a bit more explanatory functionality. Like today I got an alert about my "luteal cycle"-not really sure what that is and while I could google it, having a little "learn more" button on those would be great. But a minor recommendation for an amazing app.

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