The hex color #3f23df is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C0DC20. The grayscale version is
#6B6B6B. A 20% lighter version of the original color is
#7256FF, and Hex
#0C00AC is the 20% darker color. If the color is saturated by 10%, you get
#3B1CEB. If the color is desaturated by 10%, the color
#432AD3 is obtained.