The hex color #57308c is a dark color. The web-safe version is Hex
#663399. A complementary color is
#A8CF73. The grayscale version is
#5C5C5C. A 20% lighter version of the original color is
#8A63BF, and Hex
#240059 is the 20% darker color. If the color is saturated by 10%, you get
#572C91. If the color is desaturated by 10%, the color
#573487 is obtained.