To be able to use Natural Cycles° powered by ŌURA with an Oura Ring Gen3, you’ll need a Natural Cycles subscription and an Oura Membership.
You will need to have an active Oura Membership because certain data-related features are not available without a membership, and Oura does not process the data from your ring. Without this data, Natural Cycles cannot extract the temperature trend data that would allow the NC° algorithm to identify your daily fertility status.
For any questions about the Oura Membership, please visit this link to Oura Membership FAQs.
The Oura Ring Gen2 does not require a membership.