Glorified Video App on the iPhone

Basically all you can do with this is watch videos. You can actually do any of the math exercises, at least not on an iPhone, which would seem to me to be the whole point of such an app. Im usually too tired to actually do any of this math stuff by the time I get home from work, like so many other math students who work full-time jobs. The only time many of us can find to actually practice these skills is on our lunch breaks, and most of us arent rich enough to actually be able to afford an iPad.

Steven LeBeau about Khan Academy