Spotify Web API - Authenticate user via native mobile app rather than browser?
To summarize here's an aggregated answer:
- iOS doesn't allow for looking what apps are installed on your device, neither does Android.
- Using universal links (both on Android and iOS), you generally speaking may generate a link that opens an app, but for this, the corresponsing App needs to register this connection on your device.
- For Spotify especially, I don't think that the Spotify-app has registered such a link. It's not usual that native Apps trigger for authentication only, so it's unlikely that Spotify does.