The hex color #3d29e6 is a dark color. The web-safe version is Hex
#3333FF. A complementary color is
#C2D619. The grayscale version is
#6F6F6F. A 20% lighter version of the original color is
#705CFF, and Hex
#0A00B3 is the 20% darker color. If the color is saturated by 10%, you get
#3822F2. If the color is desaturated by 10%, the color
#4230DA is obtained.