How does Natural Cycles work?
How to use Natural Cycles
Track your fertility each day in 3 easy steps
Measure your temperature
Measure temperatures overnight using the NC° Band, Apple Watch, or Oura Ring.
Open the NC° app
Our algorithm automatically syncs & analyzes your data for you.
Confirm daily fertility status
Find out whether or not you’re fertile today & track other cycles changes.
An algorithm tailored to you
Natural Cycles pinpoints your fertile window using your unique cycle data.
Know when you’re fertile
You can only get pregnant six days a cycle. Based on your goal, NC° tells you which days to use protection, or try to conceive.
Learn the physiology of your cycle
Hormones cause your resting temperature to rise after ovulation. We analyze this and other data to determine your fertility status.
One app, five modes
Inside the NC° app
Check out some of the innovative features of the world’s first birth control app.
Understand the bigger picture
Track & compare
Stay empowered
Is Natural Cycles right for you?
What the community is saying
Dr. Katara
Has got to be THE best natural birth control on the market. 10/10 recommend!
Shadow
NC° helped me understand my body, cycle, and the best time of the month to get pregnant.
Bethany
I’ve experienced significantly less pelvic pain... and our intimacy couldn’t be better.
Common questions
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.
If you sometimes forget to measure your temperature, it will not affect Natural Cycles’ effectiveness as birth control. That said, less temperature data will make it harder for the algorithm to identify your fertile window.
We recommend adding five temperatures per week to get the most out of the Natural Cycles app.
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.
Yes. NC° Partner View is a feature included with your subscription that gives you the power to share your fertility data — and other optional information — with your partner, so that they can access it on their own device.
While Partner View is designed to help your partner learn more about your unique cycle, it’s built for you first and foremost. You can choose to add multiple accounts and remove access at any time.
The rhythm method is a type of calendar method, fertility awareness-based methods that have been around for a long time. Natural Cycles is a regulated medical device, the first FDA Cleared birth control app. It gives daily fertility statuses in the form of Red (fertile) Days and Green (non-fertile) days so you know where you are in your cycle and whether there’s a risk of pregnancy that day.
Unlike Natural Cycles, the rhythm method isn’t tailored to you. It’s based on counting cycle days and isn’t recommended for use by those with irregular cycles. It also doesn’t take into account the fact that your ovulation day can shift from cycle to cycle. Because Natural Cycles is based on the science of body temperature, it’s tailored to your unique cycle — not based on average data — offering more accurate predictions than traditional calendar methods.
The rhythm method also requires a 6-month monitoring period before it can be used as contraception, while Natural Cycles is effective from day one.
