The hex color #515ae7 is a dark color. The web-safe version is Hex
#6666FF. A complementary color is
#AEA518. The grayscale version is
#868686. A 20% lighter version of the original color is
#848DFF, and Hex
#1E27B4 is the 20% darker color. If the color is saturated by 10%, you get
#4C56F1. If the color is desaturated by 10%, the color
#565EDD is obtained.