The hex color #511bdc is a dark color. The web-safe version is Hex
#6633CC. A complementary color is
#AEE423. The grayscale version is
#6D6D6D. A 20% lighter version of the original color is
#844EFF, and Hex
#1E00A9 is the 20% darker color. If the color is saturated by 10%, you get
#4E13E7. If the color is desaturated by 10%, the color
#5423D1 is obtained.