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!

Unlike free apps, our monthly subscription helps protect you and your data. We will never sell your data – though you will have the option to help us further research women’s health. Check our science page for more info.

Birth control costs money both to make and supply. Our subscription fee means we can continue offering another hormone-free birth control option. If you live in the US, you can now get your Natural Cycles subscription reimbursed through your insurance provider.

We offer two subscription options: either an annual or a monthly subscription. Click here to find the right subscription option for you.

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.