The hex color #a151f9 is a dark color. The web-safe version is Hex
#9966FF. A complementary color is
#5EAE06. The grayscale version is
#A4A4A4. A 20% lighter version of the original color is
#D484FF, and Hex
#6E1EC6 is the 20% darker color. If the color is saturated by 10%, you get
#A149FF. If the color is desaturated by 10%, the color
#A159F0 is obtained.