The hex color #439dfc is a light color. The web-safe version is Hex
#3399FF. A complementary color is
#BC6203. The grayscale version is
#9F9F9F. A 20% lighter version of the original color is
#76D0FF, and Hex
#106AC9 is the 20% darker color. If the color is saturated by 10%, you get
#3A9DFF. If the color is desaturated by 10%, the color
#4C9DF3 is obtained.