Windows Blue — Windows Blue recalls the bright blue long associated with a well-known operating system logo, giving it its name. It belongs to the Blue family: a medium-toned, moderately saturated tone with hex code #3778BF and RGB values of 55, 120, 191. Its dominant channel values give it a cool undertone that reads as moderately saturated rather than flat. Windows Blue pairs well with complementary tones from the opposite side of the color wheel and works nicely in web and app interfaces. Nearest neighbors: cobalt.