Just out of curiosity, this isn't to steal the ideas of others, right? Sounds silly, I know. But I just want to make sure as you're asking people to show you, some Sketch-Ups of Apps that they would like to create.
I don't see how that would work. To Analyze an App, the App would need to be completed first and released into any Digital-Store. If it's a Sketch-Up though, it means the App is in a Prototyping-Stage so Development hasn't begun and the Developers are still planning out the App's Design and Functionality.