The hex color #6D71B0 is a dark color. The web-safe version is Hex
#666699. A complementary color is
#928E4F. The grayscale version is
#858585. A 20% lighter version of the original color is
#A0A4E3, and Hex
#3A3E7D is the 20% darker color. If the color is saturated by 10%, you get
#6B6FB4. If the color is desaturated by 10%, the color
#6F73AC is obtained.