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At a glance, this is a very creative way to fuse the best of digital prototyping with the spontaneity of hand drawn prototyping.

However I believe that digital linking and editing stages would be easier if it were on a browser than an iphone.

I use pop a lot and its actually really easy and intuitive. Just my opinion.

Can I use it on an iPad? For non phone app prototypes an iPhone screen seems rather small.