The hex color #3dd133 is a light color. The web-safe version is Hex
#33CC33. A complementary color is
#C22ECC. The grayscale version is
#6B6B6B. A 20% lighter version of the original color is
#70FF66, and Hex
#0A9E00 is the 20% darker color. If the color is saturated by 10%, you get
#38DB2D. If the color is desaturated by 10%, the color
#42C739 is obtained.