

You’re right that it isn’t, and doesn’t need to be, the most complicated thing in the world.
But there’s a bit more to it than it sounds like. Deck management, customizing flashcards (html/CSS templates), spaced repetition algorithms (including many user-customizable settings), statistics and visualizations.
Most importantly probably are the things they host online. Right now you can freely sync your data between devices, and they have a community portal where people upload decks to share. I’m imagining these will be among the first targets for paywalls (but could always be replaced by the community).


















Pink Floyd’s Wish You Were Here is pretty easy all around and fun to play. You get to do some picking out notes and some strumming. The one caveat is that there’s an intro solo that, while easy, is supposed to be a second guitar.