Why do Oura payloads differ from the Oura app?

Discrepancies between the Oura app and Terra usually have two causes

Discrepancies between the Oura app and Terra usually have two causes:

1

Sync timing. The Oura app can show data from the ring before it has synced to Oura's cloud, and Terra pulls from the cloud API, so a not-yet-synced ring creates a temporary gap. The user can verify cloud sync on Oura's web dashboard.

2

Field definitions. Terra's activity_seconds is total non-sedentary time across the day, whereas Oura's Activity Time refers only to tracked workout sessions. They measure different things rather than being wrong.