Natural Cycles

Women's health company whose subscription app, cleared by the FDA as a software contraceptive, uses basal body temperature to identify fertile days.

naturalcycles.com

At a glance

Headquarters: Stockholm, Sweden
Founded: 2013
Business model: B2C
Products profiled: 1
Operating markets: Sweden, United States
Sources cited: 4
In the library since: 24 September 2026

What it does

Natural Cycles' app uses basal body temperature, measured with a thermometer or a compatible wearable, to identify fertile days, with modes for preventing pregnancy, planning and following a pregnancy, postpartum and perimenopause. The company lists the NC° Band, Oura Ring, Garmin, WHOOP and Apple Watch as compatible wearables.

Independent evidence

Established from a source other than the company.

FDA records for the applicant Natural Cycles Nordic AB, product code PYT (a software application for contraception and fertility, Class 2), show six decisions: the De Novo DEN170052 (10 August 2018) and the 510(k) clearances K202897 (24 June 2021), K231274 (24 August 2023), K241006 (11 July 2024), K250561 (21 March 2025) and K253694 (17 July 2026).

What the company says

The company’s own statements, attributed to it and not presented as established fact.

The company says the app is 98% effective when used as intended and 93% effective with typical use, that it has over six million registered users and 30 peer-reviewed studies, and that it is certified in more than 35 countries. It says it was founded in 2013 by Dr. Elina Berglund Scherwitzl and Dr. Raoul Scherwitzl.

The FDA applicant address is in Stockholm; the company's July 2026 release carries a New York dateline. The funding stage is not recorded because no round was verified.