Create awesome prototypes for any device

Prototyping and collaboration platform for creating interactive prototypes that look and work exactly like your app
@erictwillis noticing more and more of these daily. Any real difference between this and Flinto, InVision, Marvel, UXPin, etc...?
@lekanb I invited the maker so that he can make his pitch. The ones listed above have significant differences between them (imo).
This is something I would use bit it's not clear to me how I (as a user) go about building a prototype. Do I have to use HTML? Is it drag and drop? Is there a scripting language to learn?