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Guide
Your Garmin and your Oura ring, in one overview.
Today this works on an iPhone, through Apple Health. Garmin Connect and the Oura app can both write to Health, and Syncera's iPhone app reads Health and keeps track of which app wrote what. Syncera does not connect to Garmin directly, and its own connection to Oura is not live yet.
Let both apps write to Health
In the Oura app, open Settings, then Apple Health under Data sharing, and connect. In Garmin Connect, switch on its link with Apple Health in the app's settings. Your iPhone then asks, for each app, which kinds of data it may write. Allow the ones you want to keep.
What each of them hands over
According to Oura, its app writes your nights with their stages, your heart rate, breathing rate, steps, active energy and the sessions it recorded. Which kinds Garmin Connect writes is up to Garmin and can differ per watch; the Health app shows them in its settings for each app. Scores that belong to one company, such as Oura's readiness or Garmin's Body Battery, have no place in Apple Health and stay in their own app.
Syncera reads Health on your iPhone
Install Syncera's iPhone app and allow it to read Health. It sends what is new in the background, most of it within the hour. Every record keeps the app that wrote it, so a night from your ring shows as Oura and a run from your watch as Garmin.
Two sources for one night
Wear both to bed and Health holds two accounts of the same night. Syncera keeps both and lets you choose which source leads for sleep, in Settings under How your sources are combined. A session both apps recorded becomes one session, and every figure shows where it came from.
Where Syncera does not help
Not on Android: Syncera does not read Health Connect. Not without the iPhone app: on the web you can upload an Apple Health export, but it brings what Health held at that moment, not what comes after. Not Garmin directly: Garmin shares its data only with approved partners, and Syncera is not one yet. Not Oura directly, yet: that connection is written and has not yet run against a real account. And not what Garmin and Oura keep to themselves.