Steel — Steel has the cool, industrial tone of polished steel, giving it its name. It belongs to the Blue and Gray family: a medium-toned, nearly neutral tone with hex code #738595 and RGB values of 115, 133, 149. Its dominant channel values give it a cool undertone that reads as nearly neutral rather than flat. Steel pairs well with cool grays for a modern, balanced look and works nicely in web and app interfaces. Nearest neighbors: cobalt.