The Wayback Machine - https://web.archive.org/web/20150905155802/http://www.morecrayons.com/

What is moreCrayons?

Most internet users have monitors that can display more colors than the 216 that are used in the traditional “browser-safe” palette. moreCrayons is a bigger box of crayons; 4,096 colors for the web.
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Welcome to moreCrayons

Cube of 4,096 colors  

Color cube

Get the big picture by viewing all 4,096 web-smart colors in a 16x16x16 cube.
 
 

Slider

Explore the web-smart palette with a color picker similar to the ones in graphics programs.