Easy to port and iOS app into Apportable with minimal effort
Apportable offers a compatibility layer which emulates Foundation, UIKit and OpenGL ES layer. Since the middleware is very configurable, it's very easy to port and iOS app into Apportable middleware with minimal effort.
They're still targeting Xcode 4.x, and Xcode 5.x support is still experimental. This is somewhat against Apple's policy that pushing developers to use only the most recent Xcode.