How does Natural Cycles work?

The Natural Cycles app is compatible with Oura Ring, Apple Watch, and NC° Thermometers.

Check out this page to find out more about ways to measure.

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.