The hex color #81b00d is a light color. The web-safe version is Hex
#999900. A complementary color is
#7E4FF2. The grayscale version is
#6A6A6A. A 20% lighter version of the original color is
#B4E340, and Hex
#4E7D00 is the 20% darker color. If the color is saturated by 10%, you get
#83B704. If the color is desaturated by 10%, the color
#7FA916 is obtained.