Temperature-powered birth control starts here

Natural Cycles is the first and only app of its kind cleared by the FDA as birth control. Most other fertility apps assume your cycle is 28 days long. This means the fertile window they predict is not personalized to your cycle. So, how can it be true to you? Our algorithm significantly reduces the risk of you receiving an incorrect fertility status since it uses your unique temperature data, which reduces the risk of unwanted pregnancy and can even help you plan for pregnancy with greater precision. 

Plus, not all period trackers keep secrets — some might even share them. With the Natural Cycles app, your data stays yours. We provide an advanced data privacy protection program designed to keep your data safe. 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!

Birth control costs money to make and supply. A subscription to the Natural Cycles app helps make hormone-free birth control more accessible, giving you more choices to find what works for you — all while supporting women’s health research.

Because we charge a subscription, we don’t need to profit from selling users’ data like some “free” apps do. Natural Cycles is committed to data privacy, and as a regulated medical device, we are required to comply with the FDA’s cybersecurity requirements.

We offer two plans: annual or monthly. Click here to find the right subscription option for you.

Yes. The effectiveness of Natural Cycles is supported by clinical evidence, which shows Natural Cycles is 93% effective with typical use. When used as intended, i.e. if you never have unprotected intercourse on Red Days, Natural Cycles is 98% effective. Read more on the science behind our effectiveness.

Forgetting to measure doesn’t impact how effective NC° Birth Control is at preventing pregnancy. However, if the app doesn’t have enough data due to poor sleep or forgetting to measure, you might get more Red Days (when you’ll need to abstain from sex or use protection).

You don’t have to wait for Natural Cycles to learn your cycle before you can start using it because Natural Cycles is effective from the first day of use!

Protecting user information is at the heart of everything we do. Natural Cycles has a comprehensive privacy protection program called NC° Secure, which is included with every Natural Cycles subscription. The program includes advanced data protection, including encryption and pseudonymization, to keep your data secure.

As part of NC° Secure, you also have the option to Go Anonymous if you need an extra layer of protection. If you Go Anonymous, your personal identifying information will be separated from your fertility data, which means that no one — not even us at Natural Cycles — can link your NC° data to you.

Natural Cycles is designed to comply with GDPR and other third-party standards. We regularly audit our systems and follow strict cybersecurity protocols to maintain a state-of-the-art level of security and encryption.

Now more than ever, sensitive data requires greater protection and regulation, and you can feel safe knowing that Natural Cycles is committed to keeping your data protected every step of the way. You can read more about our advanced data privacy protection program here.