Contraception built around you.

An FDA Cleared, non-hormonal, non-invasive way to take control of your fertility.

How it works

Choose a device

Use our free thermometer when you sign up. Or sync our app with your Apple Watch or Oura Ring.

Take your temperature

Use your chosen device to take your temperature right when you wake up.

Open the Natural Cycles app

The app shows you your fertility status, cycle trends, and helpful insights.

NC Devices
Measure with NC
Holding NC App

Let's compare birth control effectiveness


Natural Cycles°

A phone with the nattural cycles app



illustration of a male condom


Copper IUD

Copper iud



Contraceptive Pill

A package of contraceptive pills


Vaginal Ring

the contraceptive ring


Hormonal IUD

The hormonal IUD


Percentage of typical users who did not get pregnant with the method over 1 year of use. Read more.

fertility background
Is Natural Cycles° right for you?
Natural Cycles

Backed by science, the Natural Cycles° algorithm is powered by your body temperature.

Inside the app



Our FDA Cleared algorithm uses your temperature to identify fertile and non-fertile days.



Log mood, energy, and more to see how your cycle impacts you.

ovulation prediction


Customized insights and expert content to help you understand your unique experience.

Hear directly from Cyclers like you


40K+ ratings in the App Store



I feel empowered knowing about my body’s natural processes.

NC° Birth Control



I’ve experienced significantly less pelvic pain... and our intimacy couldn’t be better.

NC° Birth Control

Dr. Katara

Dr. Katara

Has got to be THE best natural birth control on the market. 10/10 recommend!

NC° Birth Control



NC° helped me understand my body, cycle, and the best time of the month to get pregnant.

NC° Plan Pregnancy


Katie and her family

Nothing short of amazing! We just welcomed our baby girl thanks to NC° 🥰

NC° Plan Pregnancy

Join Our Community


Unlike chronological age, “biological age is quite flexible; it’s a fluid parameter. It can go up and down”, says biomedical scientist Vadim Gladyshev at Harvard Medical School in Boston, Massachusetts 👨‍🔬 Follow the link in our bio to learn more 🔗Sorry, I couldn't hear you over all my newfound knowledge 🤓it's like a Pandora's box ✨🤯The Natural Cycles Team is made up of people from 20+ different countries with backgrounds in everything from astrophysics to creative writing ✨ Together we share a passion for science, data and female health 🫶 ⁠⁠With a caring and supportive culture, we’re proud to be part of a predominantly female team working for something we really believe in 💜💪

Common questions

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.