Yes — whether you're trying to prevent pregnancy or plan for one, the Natural Cycles app is effective from day one!
Clinical research shows NC° Birth Control is 93% effective with typical use and 98% effective with perfect use (meaning you either use protection or abstain on Red Days).

Forgetting to measure won't reduce effectiveness, but the app might give you more Red (fertile) Days if it doesn't have enough data due to a rough night's sleep or skipped measurements.

Thinking about starting a family? NC° Plan Pregnancy takes the guesswork out by confirming ovulation and predicting your peak fertility so you can get pregnant faster when you're ready. Learn more about the science behind our effectiveness.

Now more than ever, sensitive data requires greater protection and regulation. You can feel safe knowing that at Natural Cycles, we are committed to keeping your data protected every step of the way. As a regulated medical device that’s designed to comply with GDPR standards, we regularly audit our systems and follow strict cybersecurity protocols to maintain a state-of-the-art level of security and encryption. Visit our data security page to learn more.

We offer multiple ways to measure so you can find a wearable device that best fits your lifestyle. The Natural Cycles app easily syncs with the NC° Band, Oura Ring, or Apple Watch. The effectiveness remains the same no matter what device you choose.

If you already have an Oura Ring or Apple Watch you can start measuring right away! If you need to purchase a device, you can access an exclusive discount on select devices when you sign up. Visit our devices page to see which one is right for you.

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 called NC° Secure that is designed to keep your data safe.

Natural Cycles is just as effective if you have irregular menstrual cycles (i.e. cycles lasting fewer than 21 days or greater than 35 days in length). The Natural Cycles app adapts to your unique cycle by considering irregularities, temperature shifts, recent use of hormonal birth control, ovulation patterns, and more to provide a personalized experience.

The app’s Cycle Insights tool helps you better understand your cycle and offers tailored recommendations. It can even flag atypical patterns or irregular cycles, giving you valuable insights to discuss with your healthcare provider. Check out our NC° Cyclerpedia articles on cycle irregularity to learn more.