Natural Cycles analyzes your cycle using body temperature as the most important fertility indicator to identify your fertile window. For that reason, tracking your temperature is integral to your NC° experience. 

The following devices are compatible with Natural Cycles. Read on to identify which one is the best fit for you!

Wearable devices 

For a simplified tracking experience, the Natural Cycles app seamlessly integrates with compatible wearable devices to measure your temperature overnight. 

Currently, the only wearables Natural Cycles integrates with are the NC° Band, the Oura Ring, and the Apple Watch*. 

*To use an Apple Watch with Natural Cycles, it must have a temperature sensor. This includes Apple Watch Series 8 and later, any model of Apple Watch Ultra, and Apple Watch SE3.

Using a wearable device simplifies your routine: Wear the device while you sleep, sync it to the NC° app in the morning, and check your fertility status. This automated process means you don’t need to worry about maintaining a regular sleep schedule or strict morning routine—the device handles the tracking for you.

Wearables are a good option for people who:

• Have sleep patterns that are regular, irregular, or frequently interrupted.
• Find it challenging to consistently measure their temperature immediately upon waking each morning.
• Want to utilize the extra features available through their chosen wearable device.

While we are working to integrate additional wearables, given that Natural Cycles is regulated as a medical device by the FDA in the US and CE-marked in Europe, we are held to very high standards of quality and testing before our products reach our users. We will announce any future updates regarding new device compatibility, so stay tuned!

Basal thermometers 

If you’re using Natural Cycles with a thermometer, it’s essential that you use a basal thermometer. A basal thermometer measures with higher precision since it produces a measurement with two decimal places (regular fever thermometers only measure one decimal place). 

With a basal thermometer, measure your temperature first thing in the morning, right after waking up (before sitting up, drinking water, snoozing, or getting out of bed), as this is your resting temperature, which is lowest when you sleep. Learn more about measuring with a basal thermometer in this article When and how to measure your temperature with a basal thermometer. . 

Measuring with a basal thermometer is a good option for people who:

• Have a regular sleeping schedule (+/- 2hrs)
• Can measure first thing in the morning daily 

We offer three different models of basal thermometers depending on your region and availability. 

Basal thermometer

NC° Thermometer Gen1 (Outside the US & Europe*)

Bluetooth basal thermometer 

NC° Thermometer Gen2 (With Bluetooth function - Europe & US)

*Note: To comply with local Australian regulations, the thermometers we ship to Australia are non-branded and different from the NC° Thermometer Gen1 pictured above, but they offer the same functionalities.