Last year I wrote a small bookmarklet for doing live, on-site color blindness simulation: https://github.com/jaz303/ColorScope.js https://github.com/jaz303/Col

Last year I wrote a small bookmarklet for doing live, on-site color blindness simulation: https://github.com/jaz303/ColorScope.js https://github.com/jaz303/ColorScope.js It's by no means foolproof but I've found it useful for testing sites in development.