Hi, I actually think that prototypes are not just about communication, but also about testing. It’s nice to communicate an idea to a client or team, but if the idea does not work for the audience, you are just wasting everybodies time and money. You should therefore use your prototypes also for user testing. That’s why we made Quant-UX.com. It’s a prototyping tool, but with build in UX analytics that makes it super simple to run user tests.