Bring your cycle into focus
Natural Cycles is the only app that delivers Health Canada–authorized birth control, personalized cycle insights, and so much more.
How to use your NC° Band
Your overnight temperature is measured throughout the night.
What’s included
NC° Band
with nylon strap
USB-C
charger
1-year
warranty
Tech specifications
(1.8 × 0.8 × 0.5 in)
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.
Typical use effectiveness rates. Source:
Contraceptive Technology (Table 5-2). 22nd Edition, 2023
Support for every stage
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.
Cyclers say it best
58K+ global ratings
Ida
App Store review
With NC°’s own band, tracking temperature overnight is super easy. It's great!
Sally
App Store review
Lifer and never going back. I am using the NC° Band right now, it's amazing.
Dr. Katara
Joined in 2021
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
Joined in 2023
I’ve experienced significantly less pelvic pain... and our intimacy couldn’t be better.
Tracking your fertility with Natural Cycles just got easier
Wellness Awards
Best Fertility Product
2026 Winner
Wellness Awards
Best Innovator (NC° Band)
2026 Silver
Common questions
To get started:
- Sign up for Natural Cycles
(purchase a subscription and measuring device) - Download the app
- Follow the steps to set up your device
- Start measuring!
Designed for Natural Cycles, the NC° Band tracks your temperature trends while you sleep. Simply put it on your wrist before going to bed, wear it overnight, and open the NC° app in the morning to check your fertility status.
The NC° Band continuously measures your temperature while you sleep. Simply wear it overnight and check your NC° app for insights the next day. No daytime wear is needed.
You can purchase a silicone strap directly through the NC° Shop. They are available as individual accessories, letting you customize your look or replace an existing band. The straps are available in two signature colours, glacier (a cool blue) and lilac (a soft purple), in the NC° Shop. A darker purple version of the strap is also available for purchase in the app under the “Buy extra supplies” tab.
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.
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 a registered medical device that users pay to access. An NC° subscription is designed to keep your data safe, but it also means we don’t need to profit from your data like other “free” apps do. With Natural Cycles, you control your data.
The NC° Band is included for free with an Annual Plan. It is also available for purchase separately for $129.99. Natural Cycles is FSA and HSA eligible.
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.