This is an interesting concept. But I can't help but think it looks like it's focused on UI design interaction, and not necessarily full app design. What provisions are in place for persistent storage, push notifications, or access to an external API?
Question for the developers: It looks like the iOS app allows you to download apps built with the desktop tool, which supports evaluation of Javascript snippets. Isn't this against the App Store policy for the download and execution of arbitrary code?
Another tool for designing native iOS apps is Neonto Studio. It supports Android too:<p><a href="http://neonto.com" rel="nofollow">http://neonto.com</a><p>Neonto's generated code is "runtime-free" -- there's no framework or other intermediate runtime layer, so everything in the design is translated to the platform's native concepts. There's also an elaborate plugin API for adding new tools and capabilities.<p>(Full disclosure: I wrote most of the code in Neonto Studio.)