The hex color #51aec6 is a light color. The web-safe version is Hex
#6699CC. A complementary color is
#AE5139. The grayscale version is
#979797. A 20% lighter version of the original color is
#84E1F9, and Hex
#1E7B93 is the 20% darker color. If the color is saturated by 10%, you get
#4AB0CB. If the color is desaturated by 10%, the color
#58ACC1 is obtained.