To be able to use Natural Cycles° powered by ŌURA with an Oura Ring, you’ll need a Natural Cycles subscription and an Oura Membership.
You’ll need to have an active Oura Membership because certain data-related features aren’t available without a membership, and Oura doesn’t process the data from your ring. Without this data, Natural Cycles can’t 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.
Note: The Oura Ring Gen2 and older Oura models don’t require an Oura Membership.