For now the app is a supplement, rather than a replacement, for the Bitesize website, which offers a deeper and broader range of topics. The BBC says it will be updated over time, however, with additional subjects and new functionality. The advantage, of course, is that a mobile app should always be accessible, regardless of where the student is and how much time they have to kill. Instead of carrying a laptop or hefty revision textbook, they can pop open their smartphone while they're waiting in line for...whatever it is students wait in line for these days. The cinema?