As someone interested in learning to code who ultimately signed up for Codeyear instead of Codeschool or Team Tree House:

-Codecademy offers to teach me how to build an app -Codeschool offers to teach me how a bunch of different programming languages (which is the easy part), with no clear instructions on how to put that together into an app -Teamtreehouse does offer to teach how to build an app, but they're full of videos. Their introduction to HTML lesson is 30 minutes of video!

So Codecademy has a massively better first impression than its competitors.