Thanks for the mention! We built Whimsical for a simple reason - all the existing diagramming apps had poor UX. It didn't feel like any of them were really optimized to visualize ideas as quickly as possible while make the result look decent.

I used Whimsical to spec a complex product flow for my last project and it was by far the fastest diagramming tool I've ever used. It is not, however, a way to make beautiful diagrams.

I wish Figma would integrate the snapping behavior of Whimsical – that, I think, would be the ultimate diagramming tool.

I was hoping to find someone else mention Whimsical too. It's so fast to use. I've been recommending it to coworkers and its allowed them to be much more productive.