My favorite recipe app for the iPhone and iPad, Paprika, got a huge update the other day, bringing an iOS 7 design, autocomplete for when you are adding recipes, AirDrop support, and much more.
Best thing is Paprika is on sale for the rest of November. I have it for iPhone, iPad, & Mac, and their custom sync engine is top notch. If you have any interest in having a digital recipe box, Paprika is hands-down the app to get.