The hex color #2d37f3 is a dark color. The web-safe version is Hex
#3333FF. A complementary color is
#D2C80C. The grayscale version is
#727272. A 20% lighter version of the original color is
#606AFF, and Hex
#0004C0 is the 20% darker color. If the color is saturated by 10%, you get
#2631FF. If the color is desaturated by 10%, the color
#343DE6 is obtained.