The hex color #5128d9 is a dark color. The web-safe version is Hex
#6633CC. A complementary color is
#AED726. The grayscale version is
#717171. A 20% lighter version of the original color is
#845BFF, and Hex
#1E00A6 is the 20% darker color. If the color is saturated by 10%, you get
#4E21E3. If the color is desaturated by 10%, the color
#542FCF is obtained.