The hex color #51cd6d is a light color. The web-safe version is Hex
#66CC66. A complementary color is
#AE3292. The grayscale version is
#848484. A 20% lighter version of the original color is
#84FFA0, and Hex
#1E9A3A is the 20% darker color. If the color is saturated by 10%, you get
#4CD46B. If the color is desaturated by 10%, the color
#56C66F is obtained.