I design all of my wireframes in Illustrator. The main reason: I know how to use Illustrator extremely fast. Like seriously mind-bending fast. I don't use UI kits, ready made templates, I just open it up and start powering through ideas. Drawing all of my own buttons, icons, etc. Illustrator starts off as my digital sketch board. For 95% of the things I wireframe, I start with mobile first. This c