The hex color #687AEB is a light color. The web-safe version is Hex
#6666FF. A complementary color is
#978514. The grayscale version is
#9A9A9A. A 20% lighter version of the original color is
#9BADFF, and Hex
#3547B8 is the 20% darker color. If the color is saturated by 10%, you get
#6377F3. If the color is desaturated by 10%, the color
#6D7DE3 is obtained.