The hex color #556adc is a dark color. The web-safe version is Hex
#6666CC. A complementary color is
#AA9523. The grayscale version is
#898989. A 20% lighter version of the original color is
#889DFF, and Hex
#2237A9 is the 20% darker color. If the color is saturated by 10%, you get
#5067E4. If the color is desaturated by 10%, the color
#5A6DD4 is obtained.