The hex color #6b64e8 is a dark color. The web-safe version is Hex
#6666FF. A complementary color is
#949B17. The grayscale version is
#929292. A 20% lighter version of the original color is
#9E97FF, and Hex
#3831B5 is the 20% darker color. If the color is saturated by 10%, you get
#675FF1. If the color is desaturated by 10%, the color
#6F69DF is obtained.