Research and clinical studies have shown that Natural Cycles is 93% effective.*
* Natural Cycles is 93% effective under typical use, which means that 7 women out of 100 women get pregnant during 1 year of use. Typical use effectiveness takes into account all possible reasons for becoming pregnant while using the app: from having unprotected sex on a red day, to the app wrongly attributing a green day or the chosen method of contraception on a red day having failed.
Natural Cycles is cleared by the US FDA and CE marked in Europe as a medical device for use as a contraceptive. Read more about our regulatory clearances.
Independent Expert Fact Sheet on Natural Cycles
These are some of our App Store reviews
by Simple, accurate and natural 02 January 2018
I find this the best way to track my periods and fertility - it really is very accurate at predicting dates! I have struggled with hormonal birth control in the past, and feel so much better without it. Natural cycles has given me the freedom to just be a woman, and it feels great.
Makes a woman's life easier!!
by Tansie29 29 January 2018
Easy to use. Great way of tracking everything with great accuracy. Every woman should be using it!
by Chloe Schnell 30 January 2018
This app has revolutionized my contraception method. I now feel so in tune with my body and am so happy to be off hormones! Couldn't recommend this app enough.
I love Natural Cycles, I’ve learned so much about my body in the last year.