Sim Daltonism, an intuitive app that simulates color blindness

When we visualize data to communicate to others, we must consider what others see through their eyes. Sim Daltonism by Michel Fortin is a free app for the Mac that lets you see how those with various types of color blindness perceive what’s on your computer screen.

It’s simple to use. Just drag a window over any part of your screen to see the differences.