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Sim Daltonism - From the perspective of a color blind person, some colors are impossible to distinguish.
Stark - Contrast check and color blindness simulator for Sketch.
Coblis - If you are not suffering from a color vision deficiency it is very hard to imagine how it looks...
DevFast - Easily hire vetted developers, quickly!
Colorblind Web Page Filter - Enter a URL, and this tool will render it as someone with color blindness will see it.