The hex color #644a6c is a dark color. The web-safe version is Hex
#663366. A complementary color is
#9BB593. The grayscale version is
#5E5E5E. A 20% lighter version of the original color is
#977D9F, and Hex
#311739 is the 20% darker color. If the color is saturated by 10%, you get
#65486D. If the color is desaturated by 10%, the color
#634C6B is obtained.