The hex color #3d28d3 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C2D72C. The grayscale version is
#686868. A 20% lighter version of the original color is
#705BFF, and Hex
#0A00A0 is the 20% darker color. If the color is saturated by 10%, you get
#3922DE. If the color is desaturated by 10%, the color
#412EC8 is obtained.