At Rocket we've developed many apps that need to support iPhone and iPad. Xcode provides built-in support for configuring universal apps, meaning that a single binary can adapt to, and be optimized for, both device types. But as is with any design pattern, making your app universal has its pros and cons. The Benefits * There is a single codebase. Code can be reused for the functionality that overlaps the iPhone and iPad versions of the app. A bug fixed in one app is a bug fixed in both.