DC Entertainment publishes its comic books to four digital platforms: Comixology (the Android and iOS app that's also on the Web), Apple iBooks, Amazon's Kindle bookstore, and Barnes & Nobles' Nook platform. Mad Magazine, while not a comic, is also handled by the company's production team in Burbank, Calif.
Each platform has its own format and limitations. In addition to its new comics, DC is constantly converting previously published books to digital. Each week, DC adds between 75 and 100 digital books to its cross-platform online catalog.