Natural Cycles is the first and only app of its kind to be FDA Cleared and CE Marked. Most other fertility apps assume your cycle is 28 days long. This means the fertile window they give you is not tailored to you. Our algorithm significantly reduces the risk of you being assigned an incorrect fertile day as it uses your personal data. This reduces the risk of unwanted pregnancy, or can help you plan pregnancy with greater precision.

While some fertility apps make money from selling data for advertising, we never have, and we never will, sell our users’ data. Find out why women around the world choose Natural Cycles.

To get started:
1. Sign up for Natural Cycles (purchase a subscription and measuring device)
2. Download the app
3. Follow the steps to set up your device
4. Start measuring!

There are two subscription options: either an annual or a monthly subscription. Click here for pricing. We also offer a free demo mode once you have downloaded the app so you can get a feel for using Natural Cycles before committing to a subscription. Download the app for ios here and download for Android here. In the US, Natural Cycles is now covered by insurance. 

Yes. The effectiveness of Natural Cycles is supported by clinical evidence, which shows a typical use effectiveness rate of 93% and a perfect use effectiveness of 98%. Read more on the science behind our effectiveness.