The hex color #3657cc is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C9A833. The grayscale version is
#737373. A 20% lighter version of the original color is
#698AFF, and Hex
#032499 is the 20% darker color. If the color is saturated by 10%, you get
#3054D5. If the color is desaturated by 10%, the color
#3C5AC3 is obtained.