This app has yet to be developed for iOS.
In the last few years I've begun to get into mobile app design. The first app, now on the market, is Avatalker AAC; a speech-communication aide for nonverbal children with autism. You can see a demonstration of Avatalker at http://www.avatalkeraac.com/support.html
The second app design, Avatalker Smart Scenes AAC, exists currently on paper as we await funding for development.
I designed the software features, screen layouts and several of the graphics assets for the software interfaces. The cartoon illustrations you see in these examples are from a symbol set designed by Norman Nanstiel, Sr.