I use Digital Color Meter often, but Art Director's Toolkit is another little-known Mac utility that I use even more. It was a bundled software that shipped with G4 computers in the early OS X days, and the current version is available on Apple's App Store. It does a lot of unit conversions, color conversions, does page & layout calculations, color blending, measuring, etc... Lots of useful tools for the graphic artist and the web developer.
code-line.com is the developer.
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