Track your fertility overnight
NC° Birth Control powered by Oura temperature trends
Natural Cycles is the only FDA Cleared birth control app that uses body temperature to prevent and plan for pregnancy naturally.
How does Natural Cycles compare to other methods?
HORMONAL
HORMONAL
93%
Contraceptive Pill
93%
Vaginal Ring
99%
Hormonal IUD
NON-HORMONAL
93%
Natural Cycles°
87%
Condom
99%
Copper IUD
NON-HORMONAL
Percentage of typical users who did not get pregnant with the method over 1 year of use. Read more.
The NC° algorithm
You can only get pregnant 6 days each cycle. The algorithm behind the NC° app uses body temperature to find these days.
The algorithm learns the pattern of your cycle, giving a daily fertility status, so you can prevent pregnancy hormone-free!
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Prevent or plan pregnancy
Gain insights to help you to make informed choices about your fertility — all in one app
NC° Birth Control
Natural Cycles is the only FDA-cleared and CE marked birth control app. The app finds your fertile window by analyzing hormone-driven temperature changes, so you know which days you are fertile and not fertile.
NC° Plan Pregnancy
Find fertile days and conceive faster. Research shows that couples using Natural Cycles get pregnant in 3 cycles on average — that’s the power of knowing your cycle.
Source: Berglund Scherwitzl, E. et al. (2019), Short- and long-term effect of contraceptive methods on fecundity, Eur J Contracep Repr
NC° Partner View
With NC° Partner View you can share your fertility insights with your partner — because birth control should be a shared responsibility. If you’re using NC° Plan Pregnancy, your partner can also follow your predicted ovulation.
Frequently asked questions
Common questions
Natural Cycles is the first and only app of its kind cleared by the FDA as birth control. Most other fertility apps assume your cycle is 28 days long. This means the fertile window they predict is not personalized to your cycle. So, how can it be true to you? Our algorithm significantly reduces the risk of you receiving an incorrect fertility status since it uses your unique temperature data, which reduces the risk of unwanted pregnancy and can even help you plan for pregnancy with greater precision.
Plus, not all period trackers keep secrets — some might even share them. With the Natural Cycles app, your data stays yours. We provide an advanced data privacy protection program designed to keep your data safe. Find out why women around the world choose Natural Cycles.
To get started:
1. Sign up for Natural Cycles (purchase a subscription and measuring device)
2. Download the app
3. Follow the steps to set up your device
4. Start measuring!
Birth control costs money to make and supply. A subscription to the Natural Cycles app helps make hormone-free birth control more accessible, giving you more choices to find what works for you — all while supporting women’s health research.
Because we charge a subscription, we don’t need to profit from selling users’ data like some “free” apps do. Natural Cycles is committed to data privacy, and as a regulated medical device, we are required to comply with the FDA’s cybersecurity requirements.
We offer two plans: annual or monthly. Click here to find the right subscription option for you.
Yes. The effectiveness of Natural Cycles is supported by clinical evidence, which shows a typical use effectiveness rate of 93% and a perfect use effectiveness of 98%. Read more on the science behind our effectiveness.
You must be over the age of 18.Does not protect against STIs.
FDA Cleared
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.