Garmin & Natural Cycles: AI-Powered Birth Control via Smartwatch

Garmin announced a new product integration with Natural Cycles on March 31, 2026, enabling users of select smartwatches to access FDA-cleared birth control features directly through their wearable devices. The collaboration allows compatible Garmin hardware to track skin temperature overnight, syncing data to the Natural Cycles app to provide fertility insights. This integration marks a expansion of wearable technology into women’s health management, offering a non-hormonal option for pregnancy prevention and planning.

How the integration works

The Natural Cycles app functions as an FDA Class II medical device designed to prevent and plan pregnancy. The system analyzes body temperature and other key fertility indicators to determine a user’s daily fertility status. Hormones fluctuate throughout the menstrual cycle, causing body temperature to rise after ovulation and decrease during menstruation. Tracking skin temperature overnight provides data on these physiological changes.

Users wear a compatible Garmin smartwatch to bed, where the device tracks skin temperature throughout the night. The data automatically syncs to the Garmin Connect app and transfers to the Natural Cycles app in the morning. The app then generates personalized daily insights based on the temperature patterns. This process requires a separate Natural Cycles subscription, though Garmin users are eligible for an exclusive 28-day free trial.

Compatible devices and availability

The integration supports specific Garmin smartwatch models capable of tracking the necessary biometric data. According to the press release issued on March 31, 2026, the compatible devices include the fēnix 8, Forerunner 570, Forerunner 970, Venu 4, and Venu X1. These wearables capture the skin temperature data required for the algorithm to function correctly.

Availability for this feature is currently limited to specific regions. Access is confirmed for users in Australia, Brazil, Canada, the European Union, Norway, Singapore, Switzerland, the United Kingdom, and the United States. Markets outside this list, such as India, do not yet have access to the integration. Natural Cycles reports that its app is certified in over 35 countries and has been FDA-cleared for 8 years.

Effectiveness and medical context

Natural Cycles provides effectiveness rates based on usage consistency. The app is 98% effective when used as intended and 93% effective with typical use. These rates place the app in the same effectiveness category as the pill, according to data sourced from Contraceptive Technology, 22nd Edition, 2023. For comparison, typical use effectiveness rates for condoms are listed at 87%, while IUDs exceed 99%.

The system is designed as a hormone-free birth control method. Traditional hormonal birth control alters hormone levels, which can result in side effects such as mood swings or fatigue. The Garmin and Natural Cycles integration offers a non-hormonal route that does not interfere with the body’s natural processes. Instead, it focuses on understanding existing biological signals to inform user decisions regarding protection or pregnancy planning.

Industry perspective

Garmin executives highlighted the significance of expanding health tracking capabilities into reproductive health. Susan Lyman, Garmin Vice President of Consumer Sales and Marketing, addressed the integration in the company’s announcement.

Women all over the world utilize Garmin products for activity and health tracking, which is why this integration with Natural Cycles, a pioneer in women’s digital health, is so important. As we continue to help women meet their fitness and wellness goals, we are proud that Garmin skin temperature can be used within the Natural Cycles app for those looking for a non-hormonal approach to birth control.

Susan Lyman, Garmin Vice President of Consumer Sales and Marketing

The partnership represents a step in the ecosystem expansion for Natural Cycles. Integrating with a hardware manufacturer allows the company to utilize existing wearable data rather than requiring separate temperature tracking devices. Users must remain involved in the process, checking the app regularly and following the daily recommendations provided by the algorithm. The system aims to provide clarity on fertility windows, helping users take control of their reproductive health from birth control to pregnancy planning.

Natural Cycles notes that it is the most studied app of its kind, with 27 studies published. The company emphasizes that the technology transforms Garmin skin temperature data into actionable fertility insights. While the feature is now live for compatible users, the requirement for a subscription and specific hardware means adoption depends on existing device ownership and willingness to engage with daily tracking protocols.