Analyze Colors Used On Websites – Web Colour Data
Web Colour Data is a web service to easily find out “which colors are used on a web page”.
It works by simply submitting a URL and the service auto-extracts + analyzes the colors in it.
The color palette is presented with a breakdown in percentages and hue distribution.
Also, it is a good source of color inspiration as palettes used in many popular websites are displayed as well.