We recently updated the Vischeck website properly after 25 years. Everything is now client-side Javascript and the color vision simulations, Daltonize correction and infant vision simulations are all in the same place. Full GPL source code is available on

https://github.com/wadelab/VischeckTinyeyes

Enjoy!

This guy's entire output is incredible (from alien tellitubbies onwards). Go moose! https://mastodon.social/@ancientjames