I used to spend a lot of time making dimensions, color, and fonts spec for developers and clients. Therefore a few months ago my colleague and I worked very hard to developed an extension called Specees for Adobe Illustrator that can generate height, width, distance, length of straight lines, round corner radius, and color and fonts properties of multiple objects at the same time: http://specees.dazed.design/ (for cc2017 & 2018)
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