The hex color #0000f4 is a dark color. The web-safe version is Hex
#0000FF. A complementary color is
#FFFF0B. The grayscale version is
#515151. A 20% lighter version of the original color is
#3333FF, and Hex
#0000C1 is the 20% darker color. If the color is saturated by 10%, you get
#0000FF. If the color is desaturated by 10%, the color
#0808E4 is obtained.