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Ben Kopfleft a comment
This is the easiest diagramming app I have ever used. And the new wireframe feature is also extremely intuitive and great for quick ideas. While not as feature-rich as some others, it seems their intent was speed and simplicity over complexity, and they succeeded. Pros: super simple UX, fast, well thought out interaction model Cons: none
Whimsical WireframesLightning fast wireframing with real-time collaboration.