Natural Cycles, Birth Control & Ovulation Calc

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 8.99 USD or a yearly fee of 64.99 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 & Ovulation Calc App Description & Overview

The applications Natural Cycles, Birth Control & Ovulation Calc was published in the category Health & Fitness on 2013-12-17 and was developed by NaturalCycles Nordic AB. The file size is 30.66 MB. The current version is 2.8.1 and works well on 8.0 and high ios versions.

A few small enhancements to provide an even better Cycler experience. Enhancements include localisation improvements and a refined experience for Cyclers using older devices.

Natural Cycles, Birth Control & Ovulation Calc App Tips & Tricks

Natural Cycles, Birth Control & Ovulation Calc Reviews


Love it!  Aottbales  5 star

I've never liked adding hormones to my body so having a birth control that really makes me feel IN control is amazing. I've had sporadic periods my whole life and this app has predicted every single one accurately. It feels like magic.


By far the easiest way to track cycles  Megashli  5 star

I went off hormonal birth control several months ago and this app has been so helpful ever since. Makes natural birth control so much less stressful!


Love this app  GoldenEssenceHEC  5 star

This app has made me able to be safely off of any invasive kind of birth control, after trying the copper IUD with horrible side effects for 2 years. It has worked so well the two months I've been using it and I love having so much data about my body and my cycle. I have recommended it to everyone it is a fantastic and effective alternative to birth control methods that otherwise mess with your body and mind.


Amazing App!  jdm4321  5 star

Been great so far after one cycle! Really like this app and all the options to track how I'm feeling, etc. It's less expensive than regular birth control and so much better for my body. I have only one complaint/request - the thermometer is hard to read in the early dark hours of the morning, I really wish it had a backlight!


Great app!  Tracker11  5 star

Easy to use, and a great way to better understand your body!


Apple Watch  keke391  1 star

This review is for the Apple Watch version of the app only. Overall, the app is amazing. However, there is no option to input my temperature as Fahrenheit, even though all of my settings are Fahrenheit on my phone version of the app. I think it is a missed opportunity to make the experience even more convenient for the women who use this app.

Tara - New York

Easy to use app!  Tara - New York  5 star

I highly recommend this app to anyone looking for a natural way to prevent pregnancy or become pregnant! I stopped using the pill because I was unhappy with the way my body reacted to it but I still wanted a second form of birth control. My boyfriend sent me the link to this app and I bought a year subscription with the thermometer. Because I live in the states it took about two weeks to for the thermometer to get to me. I love the app, it's very easy to use and I like to add notes when I take my temperature to see if it can find out any other patterns about my body. I love learning about my fertility and cycles.

DJ Rahdu

All women and teens should use this  DJ Rahdu  5 star

I say teens because it's an incredible key to understanding how your body works in a world that doesn't provide much education.


Awesome Hormone-Free Birth Control!  tbryant0617  5 star

I had a lot of issues with hormonal birth control and decided to stop but my husband and I didn't want to get pregnant yet. Natural Cycles has been perfect! I love being more in tune with my cycle, staying off the hormones and preventing pregnancy. Definitely a five star app!

Be the rad you want to see

So good  Be the rad you want to see  5 star

So good to know how our bodies are supposed to work! True girl power!


Incredible!!  msbroadway7  5 star

It's so easy to use. I was skeptical before I started using it but now that I'm 5 cycles in I'll never go back! I love how much I'm learning about my body and I know that this technology is legit. Give it a chance! It sure beats using hormones 😃


This app changed my life  Houthouthout  5 star

I am so appreciative of Natural Cycles! It inspires me to be more in-tune with my body, and understand what it's doing during certain phases of my cycle. Every woman whose lifestyle is consistent enough should be using Natural Cycles, even if only to learn more about her physical body. Truly being in sync with my own body has been so empowering, and I love the added benefit of not using hormonal contraceptives or IUDs, which disrupt a female's natural biology. Thank you, NC!


Very accurate  Geenic  5 star

This app is very easy to use and easier to key in data as compared to all the other apps I've downloaded. All the other apps indicate I'll have my period in couple of days and only natural cycles predicted the exact date.


Love it!!  LaurieBaginski  5 star

Whether you use it to prevent pregnancy or to get pregnant (I've done both), this app is a game changer! This is true freedom! Preventing pregnancy without drugs. It works, people! In Europe, this is a medically accepted form of birth control now. Science at its best.


Clean and simple  JessaStyle  4 star

Very easy to navigate and much more user friendly than other more popular trackers I've come across!


Life changing  mwarren42  5 star

I had bad experiences with pretty much every form of birth control until I found Natural Cycles. I pair it with the TCOYF fertility awareness method and feel happy with my approach to birth control for the first time since my twenties. I'm 37, married, with two children.


Love it  RNlalaleni  4 star

As a medical professional I would highly recommend this app to anyone trying to conceive and anyone trying to avoid conception. I gave this app four stars instead of five because the thermometer needs improvement, it has no light so it cannot be read in the dark. The beeping also wakes my husband sometimes. As for the ridiculous claim that this app is branded towards "whites", anyone that has a period/Menstrual cycle can utilize the app.


App downloaded is not in English  belisaciagar  2 star

I'd really like to test the app but the sign up and instructions are not in English. Which limits the user base.

Filmmaker 492757

Please fix height and weight entry  Filmmaker 492757  4 star

This seems like it will be an awesome app, but there are IT coding issues that don't allow me to update my weight, and when I tried to, it even changed my height to something different! I am on the free trial but won't purchase until this is fixed. Developers, please pay attention to this review; the issue is real. Users, please have patience; this is the birth control solution we've been waiting for!


Great holistic alternative to birth control  Nina122387  5 star

Great app definitely recommend.

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