Bring your reproductive health into focus
The only FDA-cleared birth control app
Clinically proven to predict your fertile days, based on the science of your temperature.
How it works
Track temperature data in your sleep with your compatible WHOOP.
For each stage of your journey
NC° evolves with your life and goals.
Hormone-free, FDA-cleared birth control. Know your fertile days and when you need protection.
Know your peak fertility to increase your chances, then track changes and baby’s growth.
Support after birth. Monitor your cycle’s return and track your recovery at your own pace.
Understand your body’s changes, recognize symptoms, and feel prepared and in control.
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
IUD
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 learned 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
FDA cleared
for 8 years
Certified in
35+ countries
30 studies
published
Connect your cycle and wellness
Common Questions
Natural Cycles currently integrates with WHOOP 5.0 and WHOOP MG, turning your temperature data into clear fertility insights inside the NC° app.
Find out if your device works with the NC° app and start getting customized daily insights that help you plan and prevent pregnancy.
Your Natural Cycles subscription will be active as soon as you subscribe. This will give you time to familiarize yourself with the Natural Cycles app and complete the onboarding process.
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.
Checkout this article for more information about using NC° with irregular cycles.
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.
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.