As much as 5% of the male population is certifiably colour blind… (more like 50% if you’re judging by some of those far out colour combos compliments of men!) In any case, the Colour Blindness Simulator allows you to upload a colour photo and automatically see what it would look like to a colour-challenged individual. This is more than amusing - this tool is definitely helpful to any web developers out there hoping to make their site as visually appealing, to the largest number of people possible.