Natural Cycles app
Subscription app, cleared by the FDA as a software contraceptive, that uses basal body temperature to identify fertile days.
naturalcycles.comAt a glance
- Type
- Patient app
- Platforms
- iOS · Android · Wearable
- Who it’s for
- Patients
- Where it’s available
- United States
- Sources cited
- 3
- In the library since
- 24 September 2026
- Regulatory status
- FDA 510(k) K253694 (decision 17 July 2026), product code PYT, following the De Novo DEN170052 (2018) and the 510(k) clearances K202897, K231274, K241006 and K250561.As recorded from the regulator or the company, with its attribution.
- Pricing
- App Store (US): free download with subscriptions; monthly $21.99, annual $149.99
What it does
The app uses basal body temperature from a thermometer or a compatible wearable. The company lists five modes (NC° Birth Control, Plan Pregnancy, Follow Pregnancy, Postpartum and Perimenopause) and names the NC° Band, Oura Ring, Garmin, WHOOP and Apple Watch as compatible wearables.
The App Store lists it as "Natural Cycles: Fertility App" (seller NaturalCycles Nordic AB, Health & Fitness, iPhone, iPad and Apple Watch; English, Portuguese, Spanish and Swedish).
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.
Written about in the Journal
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