The hex color #51a867 is a light color. The web-safe version is Hex
#669966. A complementary color is
#AE5798. The grayscale version is
#757575. A 20% lighter version of the original color is
#84DB9A, and Hex
#1E7534 is the 20% darker color. If the color is saturated by 10%, you get
#4DAD66. If the color is desaturated by 10%, the color
#55A368 is obtained.