The hex color #687ba8 is a dark color. The web-safe version is Hex
#666699. A complementary color is
#978457. The grayscale version is
#848484. A 20% lighter version of the original color is
#9BAEDB, and Hex
#354875 is the 20% darker color. If the color is saturated by 10%, you get
#657AAC. If the color is desaturated by 10%, the color
#6B7CA4 is obtained.