The hex color #687c93 is a dark color. The web-safe version is Hex
#666699. A complementary color is
#97836C. The grayscale version is
#7D7D7D. A 20% lighter version of the original color is
#9BAFC6, and Hex
#354960 is the 20% darker color. If the color is saturated by 10%, you get
#667C95. If the color is desaturated by 10%, the color
#6A7C91 is obtained.