A year or two back three of us (one only very part-time, and two of us inexperienced) developed an iOS app that did two way translation (speech - text - text - speech) using two three different services from two different vendors, from scratch in less than a week. In Objective-C. (It didn't get submitted to the App Store, it was demoed to potential investors and then disappeared, presumably owing to the existence of similar apps.)<p>Not a terribly ambitious app, but no less ambitious than the app described.<p>Ruby Motion looks interesting, but I don't really see how it would make a big difference to shipping something like this in a very short time frame.