The hex color #660b9c is a dark color. The web-safe version is Hex
#660099. A complementary color is
#99F463. The grayscale version is
#5A5A5A. A 20% lighter version of the original color is
#993ECF, and Hex
#330069 is the 20% darker color. If the color is saturated by 10%, you get
#6703A3. If the color is desaturated by 10%, the color
#651395 is obtained.