The hex color #3f29df is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C0D620. The grayscale version is
#6D6D6D. A 20% lighter version of the original color is
#725CFF, and Hex
#0C00AC is the 20% darker color. If the color is saturated by 10%, you get
#3A22EA. If the color is desaturated by 10%, the color
#4430D4 is obtained.