I like doorkeeper as well. Opro doesn't currently support any other backends other than ActiveRecord, so if you're using mongo you would need to use doorkeeper.

I like doorkeeper as well. Opro doesn't currently support any other backends other than ActiveRecord, so if you're using mongo you would need to use doorkeeper. I started writing opro before DK was out in the wild. There were some things I had in opro that weren't in DK so I decided to keep developing it. Last time I checked here are some differences: - Deals with CSRF protected resources automatically - Works with your login system (like devise), not around it. No special casing or configuration is needed - Comes with built in docs. - Comes with built in test controller You can play around with it here: http://opro-demo.herokuapp.com/ http://opro-demo.herokuapp.com/.