Comics is the best app for buying comic books -- and graphic novels -- on your iPad. Well, that's not exactly true. Comics is one of the best places to buy comics, but the developer, comiXology also makes dedicated versions of the app for Marvel, DC, Dynamite, IDW, Image, and other publishers. They claim over 16,000 titles, more than enough to delight anyone's inner Sheldon. Comics itself has a great selection of titles from several of their partner publishers and, taken together, the comiXology apps are everything you need to get your weekly fix of new releases and classic back issues alike.