The hex color #a151b2 is a dark color. The web-safe version is Hex
#996699. A complementary color is
#5EAE4D. The grayscale version is
#8C8C8C. A 20% lighter version of the original color is
#D484E5, and Hex
#6E1E7F is the 20% darker color. If the color is saturated by 10%, you get
#A34BB6. If the color is desaturated by 10%, the color
#9F57AE is obtained.