The difference I see between CodeSchool and Codecademy is that Codecademy's front page is targeted to people with zero prior experience. CodeSchool on the other hand is pushing classes for learning CoffeeScript, jQuery, and Rails. People with no prior experience aren't going to know what the heck those are or why they should care. Codecademy's proposition on the other hand is straight forward, "Learn to code". Note there is no mention on their main page of what language. It's like they are doing for coding what Apple did for the PC marketing in the sense that Apple doesn't really focus on the processor memory details etc...