Sim Daltonism | color blindness simulator for Mac OS X

Sim Daltonism is a color blindness simulator for Mac OS X. It filters in real-time the area around the mouse pointer and displays the result — as seen by a color blind person — in a floating palette. This is a fantastic tool for any web designer out there. Thank you Tony!

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  1. Color Oracle ( is my personal pick — it has fewer types of colorblindness to choose from, but it has full screen simulation, simulation hot keys, and it’s faster. There are also versions for Windows and Linux.