The hex color #687fa0 is a dark color. The web-safe version is Hex
#666699. A complementary color is
#97805F. The grayscale version is
#828282. A 20% lighter version of the original color is
#9BB2D3, and Hex
#354C6D is the 20% darker color. If the color is saturated by 10%, you get
#657FA3. If the color is desaturated by 10%, the color
#6B7F9D is obtained.