Understand your fertility with NC°
Measure temperatures overnight with NC° Band or a compatible wearable.
Open the NC° app to see daily fertility updates, cycle trends, and insights.
See all your cycle insights in one place, download your Cycle Report and make informed decisions about your health.
One app, five modes
NC° Birth Control
NC° Plan Pregnancy
NC° Follow Pregnancy
NC° Postpartum
NC° Perimenopause
More than a period tracker
You can’t get pregnant 24/7, but NC° knows when you can. The app uses key biomarkers like temperature and period data to identify your fertility and help you plan accordingly.
More than a period tracker
Take control, feel empowered
No side effects, 100% you
See your cycle in a new light
Navigate fertility with confidence
Let’s get to know you.
What can we help you with?
Inside the NC° app
Check out some of the innovative features of the world’s first birth control app.
Stop guessing, start knowing
Wake up to fertility freedom each day — use protection on your terms.
Explore personalized insights
Know your cycle better than ever and export insights to share with your doctor.
Stay empowered
Make informed decisions and boost body literacy with curated health expertise.
Feel safe knowing your data is protected
NC° Secure is our comprehensive privacy protection program, included with every subscription.
Meet our community
App Store
58K+ global ratings
Dr. Katara
Has got to be THE best natural birth control on the market. 10/10 recommend!
Michelle
I feel empowered knowing about my body’s natural processes.
Shadow
NC° helped me understand my body, cycle, and the best time of the month to get pregnant.
Know your body, own your journey
Common questions
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.
You can measure in a way that fits your lifestyle. Natural Cycles integrates with a range of wearable technology, allowing you to smoothly sync your temperature data with the NC° app.
Whichever wearable you choose, the effectiveness of NC° Birth Control stays the same. Visit our devices page to explore all of our compatible integrations and learn more about your measuring options.
If you already own a compatible wearable, you can start measuring right away. New to wearables? When you sign up, you can unlock exclusive discounts on select devices.
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 personalized to you. Our algorithm significantly reduces the risk of you being assigned an incorrect Green 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 never will sell our users’ data. Find out why women around the world choose Natural Cycles.
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.
You must be over the age of 18.Does not protect against STIs.
Natural Cycles is 93% effective with typical use, 98% effective with perfect use. No method of contraception is 100% effective. Natural Cycles does not guarantee that you cannot get pregnant; it only informs you whether and when you can become pregnant based on the information that you enter into the application.
Natural Cycles is available as a method of birth control in the US and territories; Canada; United Kingdom; Ireland; France; Germany; Netherlands; Luxembourg; Belgium; Spain; Portugal; Austria; Switzerland; Italy; Latvia; Lithuania; Malta; Estonia; Sweden; Denmark; Norway; Finland; Iceland; Bulgaria; Czech Republic; Hungary; Poland; Romania; Slovakia; Greece; Cyprus; Croatia; Slovenia; Montenegro; Singapore; Australia; Brazil. Outside these countries listed, Natural Cycles is intended to be used for fertility monitoring.