The hex color #781ddc is a dark color. The web-safe version is Hex
#6633CC. A complementary color is
#87E223. The grayscale version is
#7B7B7B. A 20% lighter version of the original color is
#AB50FF, and Hex
#4500A9 is the 20% darker color. If the color is saturated by 10%, you get
#7814E6. If the color is desaturated by 10%, the color
#7826D2 is obtained.