The hex color #81d77a is a light color. The web-safe version is Hex
#99CC66. A complementary color is
#7E2885. The grayscale version is
#9B9B9B. A 20% lighter version of the original color is
#B4FFAD, and Hex
#4EA447 is the 20% darker color. If the color is saturated by 10%, you get
#7EDD77. If the color is desaturated by 10%, the color
#84D17D is obtained.