The hex color #4b9d91 is a light color. The web-safe version is Hex
#339999. A complementary color is
#B4626E. The grayscale version is
#7E7E7E. A 20% lighter version of the original color is
#7ED0C4, and Hex
#186A5E is the 20% darker color. If the color is saturated by 10%, you get
#46A093. If the color is desaturated by 10%, the color
#509A8F is obtained.