The hex color #521ec2 is a dark color. The web-safe version is Hex
#6633CC. A complementary color is
#ADE13D. The grayscale version is
#666666. A 20% lighter version of the original color is
#8551F5, and Hex
#1F008F is the 20% darker color. If the color is saturated by 10%, you get
#5017CB. If the color is desaturated by 10%, the color
#5425B9 is obtained.