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tota11y - An accessibility visualization toolkit from Khan Academy
Sim Daltonism - From the perspective of a color blind person, some colors are impossible to distinguish.
Nibbler - Free tool for testing how good your website is, and what you can do to improve it. Check accessibility, SEO, social media, compliance and more.
Coblis - If you are not suffering from a color vision deficiency it is very hard to imagine how it looks...
Page Speaker - Modern web accessibility tools for agencies & webmasters
Colour Blindness Simulator - Use our Colour Blindness Simulator to reveal how your images may appear to users with a variety of...