Natural Cycles is an easy to use Medical App for Contraception.


How does it work?

The app uses a unique algorithm to analyse fluctuations in a woman’s basal body temperature to identify ovulation and predict fertile days. The app is used by women in combination with a basal thermometer and informs a woman on which days of her cycle she is fertile and recommends her to use protection (e.g. a condom) or abstain from sex during these days.

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Clinical studies and research

Natural Cycles is the only Medical App that has been certified in the EU as a Medical Device for use in Contraception. The Pearl Index of Natural Cycles for typical use (7.0) and perfect use (1.0) has been demonstrated in 2 separate prospective, real-world, observational effectiveness studies, which were both published in peer-reviewed journals.

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Who is it suitable for?

Natural Cycles provides women an option for a more ‘natural’ approach to contraception and a way to better understand their body and menstrual and reproductive cycle. Natural Cycles increases contraceptive choice and may provide an effective option for women who are unhappy with their current method of contraception.

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Certification in the European Union

An EU Notified Body has certified Natural Cycles as a class IIb medical device intended for use as contraception. This puts the app in the same category as the condom. All manufacturers of medical devices in class IIb are subject to assessments and audits performed in regular intervals by Notified Bodies in accordance with the European Directive 93/42/EEC on Medical Devices.

Pearl Index


Typical use

Based on two clinical studies involving more than 22.000 women



Registered Cyclers

Typical Natural Cycles user is between 25 and 35 years old




Natural Cycles has registered users from over 200 countries

Satisfaction Rates


In the App Store

Based on the reviews from the users