The hex color #428be4 is a dark color. The web-safe version is Hex
#3399CC. A complementary color is
#BD741B. The grayscale version is
#909090. A 20% lighter version of the original color is
#75BEFF, and Hex
#0F58B1 is the 20% darker color. If the color is saturated by 10%, you get
#3A8AEC. If the color is desaturated by 10%, the color
#4A8CDC is obtained.