The digital fertility awareness-based method that predicts daily fertility to either prevent or plan pregnancy. 93% effective with typical use, 98% effective with perfect use.
FSA & HSA
The first and only birth control app to be FDA cleared in the US and CE marked in Europe (device classes II/IIb).
Natural Cycles is a fertility awareness-based method composed of an app and a thermometer. The app is powered by an algorithm that adapts to each woman’s cycle, using temperature data to determine fertile days. Unlike calendar-based trackers, this provides a personalized fertility status for each user.
Access to a daily fertility status means a woman can prevent pregnancy by abstaining from sex or using protection on her fertile days. Natural Cycles can also be used in ‘plan mode’ to help women conceive when they want to start a family.
The algorithm uses basal body temperature, menstruation data and optional LH test results to determine the fertile window. It confirms ovulation by analyzing temperature shifts caused by hormones.
The user takes her temperature most mornings when she wakes up and enters the reading into the app. The algorithm then learns the pattern of her cycle and is able to assign a daily fertility status. This is given as either a red (fertile) day or a green (non-fertile) day.
Unlike other fertility awareness-based methods, Natural Cycles adapts to each woman’s cycle, predicting and confirming her specific ovulation. This means Natural Cycles can be used by women with irregular cycles or conditions, such as PCOS, helping them gather data to present when discussing potential health concerns.
Natural Cycles is 93% effective with typical use and 98% with perfect use. Our FDA clearance is based on a study of over 15,000 women, while our certification in Europe is based on 22,000 women. Natural Cycles is the only app regulated for contraceptive use.
Typical use effectiveness includes users who have unprotected sex on fertile days, whereas perfect use counts only users who abstain or use protection on fertile days.
93% typical use effectiveness is based on 100 women using the method over 12 months, meaning on average 7 women out of the hundred get pregnant using Natural Cycles in a year.
Here you can see how our effectiveness lines up with common hormonal & non-hormonal methods.
*Percentage of typical/perfect users who did not get pregnant with the method over 1 year of use.
Reference: Contraceptive Technology (Table 26 - 1). 21st Edition, 2018 —>
Source: Trussell J . Contraceptive Efficacy. In Hatcher R A, Trussell J, Nelson A L , Cates W, Kowal D, Policar M. Contraceptive Technology: New York NY: Ardent Media, 2018—>
We have dedicated studies behind the use of Natural Cycles, both as a contraceptive and as a means to help couples conceive. Furthering research in women’s health is built into our mission. Why not browse our full list of peer-reviewed studies for more information?
Find out more about Natural Cycles with our list of links and resources where you can download further information.
We’re always interested in talking with healthcare professionals and working with businesses in the field of women’s health. If you’re curious about collaboration, or simply want to know more about what we’re doing, why not reach out to our team?
Dr. Jack Pearson (PhD)
Medical Affairs Manager