Websites and apps have become more complex. As a result, so have our tools for building them. It used to be that you could present your mockups as a series of static images. But this left you hoping your stakeholders or developers would connect the dots. Your designs were always at risk of misinterpretation.

I have awful memories of using my hands and sound effects to describe the behaviour of an element to a client. I struggled. So did they.

This type of situation is now something we can avoid. We can build prototypes of our product interactions or user…