Temperature-powered birth control starts here
Exclusive 28-day free trial for Garmin users
Effective birth control
and so much more
Clinically proven to predict your fertile days,
based on the science of your temperature.
Effective NC° Birth Control using your Garmin temperature
100% natural birth control
Free from hormones and side effects
Status tells you when to use protection
Get started in 3 easy steps
How effective is
NC° Birth Control?
98% when used as intended,
93% with typical use.
NC° is in the same effectiveness category as
the pill with zero side effects.
Condom
NC°
The Pill
Coil
Typical-use effectiveness rates. Source:
Contraceptive Technology (Table 5-2). 22nd Edition, 2023
Cyclers say it best
58K+ global rating
Dr. Katara
Joined in 2021
Has got to be THE best natural birth control on the market. 10/10 recommend!
Shadow
Joined in 2019
NC° helped me understand my body, cycle, and the best time of the month to get pregnant.
Michelle
Joined in 2022
I feel empowered knowing about my body’s natural processes.
Chlöe
Joined in 2022
I feel safe and secure with NC and have learnt more about my cycle and body through the app.
Allison
Joined in 2025
I love the educational messages I receive that allow me to take my knowledge to the next level.
Natural Cycles is the most studied app of its kind
Up your game with fertility insights you can trust
Common questions
Natural Cycles now integrates with compatible Garmin wearables, turning your temperature data into clear fertility insights.
[Find out if your wearable] works with the NC° app and start getting customised daily insights that help you plan and prevent pregnancy.
Yes, you can use Natural Cycles with an irregular cycle, and it’s just as effective.
Natural Cycles captures your unique cycle patterns by considering cycle irregularity, temperature fluctuations, recent use of hormonal contraception, ovulation day variation, sperm survival, and several other essential factors to provide a tailor-made solution for each individual.
For more information about using NC° with irregular cycles, check out this article.
The Natural Cycles app doesn’t share back information with Garmin. This is a one-way integration, meaning that any data you log in the Natural Cycles app will not sync back with the Garmin app. Always refer to the NC° app for your daily Fertility Status.
Natural Cycles is committed to protecting your data. We have strong security protocols, including encryption and pseudonymisation, to keep your data secure. As a regulated medical device, Natural Cycles is required to comply with the FDA's cybersecurity requirements. And as a Swedish-based company, we are designed to comply with GDPR standards, pledging to safeguard your data no matter where you live. Learn more about how we protect your data here.
Natural Cycles is the first and only app of its kind cleared by the FDA as birth control. Many fertility apps are based on a 28-day cycle. This means the fertile window they predict is not personalised to your cycle. So, how can it be true to you? Our algorithm uses your unique temperature and cycle data to significantly reduce the risk of an incorrect fertility status, helping minimise unintended pregnancy and support pregnancy planning with greater precision.
Plus, privacy protection isn’t included with all apps, but it is with your NC° subscription. With NC° Secure, your cycle data is private and secure.
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.