Note: To be able to access the Apple Watch integration, make sure to update your NC° app to version 5.1.0 and phone operating system to iOS16.
In order to use an Apple Watch with Natural Cycles, your watch must have a temperature sensor. Apple Watch Series 8 and higher have temperature-sensing capabilities - this includes Apple Watch Series 8, Series 9, Ultra, and Ultra 2.
If you have an Apple Watch but are not sure which model you have, this article may be helpful.
Learn more about how the Apple Watch works with Natural Cycles here.