The hex color #3d33d0 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C2CC2F. The grayscale version is
#6B6B6B. A 20% lighter version of the original color is
#7066FF, and Hex
#0A009D is the 20% darker color. If the color is saturated by 10%, you get
#382DDA. If the color is desaturated by 10%, the color
#4239C6 is obtained.