Colors v2.0.0
Get it from Packal (Recommended)
Quick Summary:
This workflow can process and convert all CSS color formats and several Objective-C formats, namely NSColor (calibrated and device) and UIColor. It also provides an interface to the OS X color panel for easier color manipulations.
It's written in native code (i.e. it's really fast).
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You can find a full description on Packal.
Direct download • source code on Github