Strava's API Blocks Cross-User Data Sharing, Even for Public Activities

Strava prohibits third-party developers from displaying one user's publicly visible activities to another user via its V3 API. The restriction applies regardless of original privacy settings. This constraint forces third-party apps into single-user silos, preventing leaderboards, social features, or competitive integrations—effectively positioning Strava's own platform as the sole venue for social fitness interaction on its data.