This is the practical shelf: how to export your data, what the API does and does not include, which limitations are real, and how Oura compares to the alternatives. It also covers the things the ring genuinely cannot see — third-party workouts, anything happening while it is off your finger, and the difference between a measurement and an estimate.
Knowing where the data stops is part of reading it well. A ring that reports a number for everything invites the assumption that everything was measured, and a surprising amount of it is inferred. These posts are about using the device with an accurate picture of what it is doing.
Pedro Thomaz builds Vitra, a desktop app that reads Oura data against your own baseline instead of a population average. He has worn a ring daily for years and reads these same numbers every morning — which is where most of what is written here comes from. Vitra is not a medical device and nothing on this blog is medical advice.
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