The hex color #30379c is a dark color. The web-safe version is Hex
#333399. A complementary color is
#CFC863. The grayscale version is
#565656. A 20% lighter version of the original color is
#636ACF, and Hex
#000469 is the 20% darker color. If the color is saturated by 10%, you get
#2C34A3. If the color is desaturated by 10%, the color
#343A95 is obtained.