For optimal use of the app, we kindly ask you not to sync any data that was recorded when you were using hormonal birth control, as this may negatively impact your predictions. The hormones from hormonal birth control generally work to inhibit ovulation and also affect your body temperature making it impossible to combine with Natural Cycles.
Apple HealthKit is an integration with Apple’s Health app, which allows you to sync your data from different apps into one Health app.
Our integration with Apple Health enables you, for instance, to import fertility data into Natural Cycles from the Health app, in case you were tracking your fertility before in a different app and don’t want to start from scratch with Natural Cycles.
You can sync your data with Apple by going to the menu > Settings > Integrations > Sync with Apple Health.
Please bear in mind that it is not possible to unsync the data that you import from Apple Health.*
You can also back up your data collected with Natural Cycles into the Health app if you wish to. In the Apple Health app, you can enable which data you would like to sync. This functionality is only supported on iOS devices and not on Android.
*If you would like to unsync the data imported from Apple Health, we recommend that you first try and unsync it from the Apple Health app, as some users have reported that this worked for them. If that does not work, please reach out to us via this link https://help.naturalcycles.com/hc/en-us/requests/new and our support team will assist you.