Great app, and free

The best part is the test at the end where color blind people can see the numbers and normal color cannot. Now they know it feels. The website also explains why the army does not prohibit colorblindness. Apparently we are better at see shapes versus shades even if it is green against green. Now I know why I was always so much better at seeing the enemy before they saw me.

4thelittleguy about PseudoChromatic ColorTest