Calculate color value relationship [closed]

Question

Is there a web app that could compute the relationship between two colors?

I have an existing style guide with established hex values. I would like to add these colors as hsla values in sass variables. I can add each one as an independent variable but I would rather base all the colors on one base color. Then use percentages of change to establish the other colors. In doing this I could color shift the theme and maintain the "correct" values in the relationships.

Answer 1

Maybe a bit late, but I found this while searching for the exact same functionality:

http://ethanmuller.github.io/sass-color-function-generator-thing/

For example: The input colors #ff0000 and #552222 result in the SASS function darken( desaturate( #ff0000, 57 ), 27 )