The hex color #1d10c1 is a dark color. The web-safe version is Hex
#3300CC. A complementary color is
#E2EF3E. The grayscale version is
#4F4F4F. A 20% lighter version of the original color is
#5043F4, and Hex
#00008E is the 20% darker color. If the color is saturated by 10%, you get
#180ACC. If the color is desaturated by 10%, the color
#2216B6 is obtained.