Before Jukely, I was the product development manager for several iOS applications. Comparing my experience of building Jukely in RubyMotion to those other iOS apps my developers built using Objective-C, I can say that an application in RubyMotion can be built probably twice as fast. This may sound controversial, and is my personal opinion but that's what I believe. It took me around 2 1/2 months to build the iOS portion of Jukely and my estimation would be that it would take 4-5 months to build it in Objective-C.