The app version of Mark Bittman’s best-selling cookbook is destined to be a classic for iPad users. Mark Douglas of Culinate, the company that created the How to Cook Everything app, sheds light on the key qualities of a successful cooking app. "The beauty is that each cooking app, just like a printed cookbook, has a style that makes it successful and unique," he says. "You need to properly identify and focus on those elements that work and make it the best it can be." The app certainly excels in its quality and content. Not only are all 2,000 recipes of the original cookbook available, but the iPad app includes features such as a tutorial section, a notes tab, and voiceovers from Mark Bittman himself.