The hex color #437dfa is a dark color. The web-safe version is Hex
#3366FF. A complementary color is
#BC8205. The grayscale version is
#939393. A 20% lighter version of the original color is
#76B0FF, and Hex
#104AC7 is the 20% darker color. If the color is saturated by 10%, you get
#3B7BFF. If the color is desaturated by 10%, the color
#4B7FF0 is obtained.