The hex color #3f099c is a dark color. The web-safe version is Hex
#330099. A complementary color is
#C0F663. The grayscale version is
#4C4C4C. A 20% lighter version of the original color is
#723CCF, and Hex
#0C0069 is the 20% darker color. If the color is saturated by 10%, you get
#3E02A4. If the color is desaturated by 10%, the color
#401094 is obtained.