The hex color #437AF3 is a dark color. The web-safe version is Hex
#3366FF. A complementary color is
#BC850C. The grayscale version is
#909090. A 20% lighter version of the original color is
#76ADFF, and Hex
#1047C0 is the 20% darker color. If the color is saturated by 10%, you get
#3B78FD. If the color is desaturated by 10%, the color
#4B7CE9 is obtained.