I just stumbled upon a very nice web/mobile application called Realizer. It allows you to upload sketches (single screens) of User Interface designs for iPhone or iPad to a web interface. You can then link these single screens by adding interactive areas in your sketch, such as buttons. Having finished your mock-up, you can download an iphone/ipad app to show the prototype to others on your handheld device.
I think you could not only prototype mobile apps with this tools but possibly also other complex designs, such as Service designs. It's worth exploring further at http://realizerapp.com/
Our daily sketching and prototyping work used to focus itself mainly on desktop applications. These days mobile is getting a larger and larger share of our design time. Not all sketching and prototyping tools for desktop applications work well for mobile apps. Therefore we need to broaden our arsenal of tools so we can more efficiently prototype mobile applications. This time I’m focusing on iphone design tools since most of the mobile applications we design are for iPhone.
Posted by: iOS 6 | September 03, 2012 at 08:20 AM