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Algis Jočysleft a comment
Alloy allows you grab any web page (even where login is needed) and start prototyping from there. The precession and quality of the initial UI - is in a league of it's own. Usually it is pixel perfect. I've recommended it to my designer friends, every single one who tried was blown away by the quality of UI (that is grabbed from live page). Try it!
Alloy AI prototyping with your real app