C9.io / nitrous.io are online IDEs with collaborative functionality.
Codr is much more lightweight - a collaborative paste-bin if you will. In this regard Codr is similar to Code Pen or Gist.
Codr is great for quick, informal collaboration - when you're on the phone or on IRC with someone you can say "let me show you" instead of "let me tell you".
Unlike C9.io or nitrous.io, you don't need to create a project, share an invite link, mess with permissions, etc.
Codr is much more lightweight - a collaborative paste-bin if you will. In this regard Codr is similar to Code Pen or Gist.
Codr is great for quick, informal collaboration - when you're on the phone or on IRC with someone you can say "let me show you" instead of "let me tell you".
Unlike C9.io or nitrous.io, you don't need to create a project, share an invite link, mess with permissions, etc.