The hex color #81f73f is a light color. The web-safe version is Hex
#99FF33. A complementary color is
#7E08C0. The grayscale version is
#929292. A 20% lighter version of the original color is
#B4FF72, and Hex
#4EC40C is the 20% darker color. If the color is saturated by 10%, you get
#7FFF37. If the color is desaturated by 10%, the color
#83ED47 is obtained.