The hex color #a91ef4 is a dark color. The web-safe version is Hex
#9933FF. A complementary color is
#56E10B. The grayscale version is
#949494. A 20% lighter version of the original color is
#DC51FF, and Hex
#7600C1 is the 20% darker color. If the color is saturated by 10%, you get
#AB12FE. If the color is desaturated by 10%, the color
#A72AEA is obtained.