Natural Cycles
Verified working Aug 19, 2026
An FDA-cleared app for fertility tracking and hormone-free contraception.
Natural Cycles is a subscription-based women’s health app that uses temperature and other biomarker data to estimate fertility status. It offers modes for birth control, trying to conceive, pregnancy, postpartum recovery, and perimenopause, with wearable integrations for overnight measurement.
Why it stands out
- FDA-cleared as a birth control app, not just a general period tracker.
- Uses individualized temperature data rather than assuming a standard 28-day cycle.
- Covers multiple reproductive stages in one account, from contraception to pregnancy and perimenopause.
- The site cites extensive clinical research, certification in 35+ countries, and years of regulated medical-device status.
- Subscription model is positioned around privacy rather than ad-supported data monetization.
Good to know
- Requires a paid subscription, and getting started involves a measuring device or compatible wearable.
- Birth control effectiveness depends on following the app’s fertile-day guidance and using protection or abstaining on Red Days.
- Typical-use effectiveness is listed as 93%, so it is not in the same effectiveness range as long-acting methods such as IUDs.
- It is designed around cycle and fertility tracking, not diagnosis or treatment of medical conditions.
Photos
People seeking non-hormonal contraception can use it to identify fertile days and know when protection is needed. Track ovulation timing while trying to conceive. Follow cycle and body changes during pregnancy, postpartum, or perimenopause. Use compatible wearables to reduce manual temperature-taking routines.
FDA-cleared birth control mode; personalized fertility-status algorithm based on temperature data; modes for pregnancy planning, pregnancy tracking, postpartum, and perimenopause; wearable integrations for overnight biomarker collection; effectiveness information and published research summaries.
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