The hex color #6543cf is a dark color. The web-safe version is Hex
#6633CC. A complementary color is
#9ABC30. The grayscale version is
#7D7D7D. A 20% lighter version of the original color is
#9876FF, and Hex
#32109C is the 20% darker color. If the color is saturated by 10%, you get
#633DD7. If the color is desaturated by 10%, the color
#6749C7 is obtained.