The hex color #423e9c is a dark color. The web-safe version is Hex
#333399. A complementary color is
#BDC163. The grayscale version is
#5F5F5F. A 20% lighter version of the original color is
#7571CF, and Hex
#0F0B69 is the 20% darker color. If the color is saturated by 10%, you get
#3F3BA2. If the color is desaturated by 10%, the color
#454196 is obtained.