The hex color #3f34b4 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C0CB4B. The grayscale version is
#626262. A 20% lighter version of the original color is
#7267E7, and Hex
#0C0181 is the 20% darker color. If the color is saturated by 10%, you get
#3B2FBC. If the color is desaturated by 10%, the color
#4339AC is obtained.