Natural Cycles is a mobile app designed to help women track their fertility. The app predicts the days on which a woman is fertile and may be used for planning pregnancy and contraception. It was developed by scientist Elina Berglund, who founded the company with her husband, Raoul Scherwitzl.[1][2][3][4]
The app was the first to be certified as a contraceptive in the European Union and in August 2018 the Food and Drug Administration approved U.S. marketing for the app.[5]
The app has come under criticism for misleading advertising and potential lack of efficacy.