Is it possible to get app info from just a Client-ID?

Short of it’s name if you can guess what a valid redirect URI is for the ClientID. No.

That said, there is no other information about a ClientID.

A clientID has:

  • The ClientID
  • A name
  • A non recoverable Client Secret
  • One or more Redirect URI’s
  • a category (which is just used internally by Twitch if they review a clientID probably)