Great material but the app isn't great – Khan Academy Review

Videos auto play in background while moving to other videos if you don't pause, why would you want that? There's no forward arrow to go back to it either so you gotta make sure you can find the video again and Pause it or force quit the app! Also I'd love to be able to read comments on the videos like on the main website, sometimes things are cleared up in the comments!
Review by Bernie Babylon on Khan Academy.