Daltona Color Blind Simulator

The red and the green in the default chart palette are obvious to most people and the same colour to a deuteranope. Daltona finds that pair before your users do. Put your palette in. Daltona checks every pair against every kind of colour blindness, and tells you which two collapse — not "here is a simulation, you decide", but the worst pair, named, with the numbers. WHAT IT ACTUALLY CHECKS Every colour, under deuteranopia, protanopia, tritanopia and full monochromacy. Each swatch shows the colour you chose on top and what that vision sees underneath, touching, with no line between them — because the question is whether they are the same colour, and a border would let your eye pretend they are not. Tap any swatch to see it under all five at once. TWO DIFFERENT TESTS, AND THEY DISAGREE WCAG contrast ratios, with all four conformance levels and real text at real sizes on the real…