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Been playing around with the state of the art in UI design tools. Long way to go there still too, tons of opportunity for innovation.

Adobe Reflow, Macaw, Webflow, VS, Xcode

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. Still in invite-only beta, but you can see some examples at blog.pixate.com.

pixate is mobile only, right?

It's certainly emphasizing mobile, but the design ideas aren't fundamentally tied.

is it the interaction design that you find compelling?

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Yes, that's all: the ability to interactively specify behavior and response in addition to static visuals.