OAuth flow chooser
What kind of app, is there a user, offline access needed - and the right grant comes back RFC-cited, with implicit and ROPC retired by name per RFC 9700.
Identity & tokensPick your app type and the recommendation appears - the grant, the RFCs, and the flows you should NOT use, with reasons.
API endpointGEThttps://ronutz.com/api/v1/oauth-flow-chooserDocumented, not served. Opens the specification.