My Favorite Color App has to be Color Expert made by Code Line.
Since 2008, Color Expert has been a direct source for organizing and determining my online and print palettes.
Making your life easier, you can start by using the Color wheel, image, swatch book or camera. Once you’ve selected your color – you can move forward and work off the schemes (mono, complementary,… etc) and email yourself the entire breakdown and results.
Couldn’t be easier.
Kuler is my top desktop choice.