The hex color #28c99f is a light color. The web-safe version is Hex
#33CC99. A complementary color is
#D73660. The grayscale version is
#858585. A 20% lighter version of the original color is
#5BFCD2, and Hex
#00966C is the 20% darker color. If the color is saturated by 10%, you get
#1FD0A2. If the color is desaturated by 10%, the color
#31C29C is obtained.