The hex color #a151f0 is a dark color. The web-safe version is Hex
#9966FF. A complementary color is
#5EAE0F. The grayscale version is
#A1A1A1. A 20% lighter version of the original color is
#D484FF, and Hex
#6E1EBD is the 20% darker color. If the color is saturated by 10%, you get
#A149F8. If the color is desaturated by 10%, the color
#A159E8 is obtained.