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 flows. Testing the usability and functionality of these is a simple thing to do. It’s so easy, coding skills are no longer a prerequisite. …