The hex color #6ee9c5 is a light color. The web-safe version is Hex
#66FFCC. A complementary color is
#91163A. The grayscale version is
#B4B4B4. A 20% lighter version of the original color is
#A1FFF8, and Hex
#3BB692 is the 20% darker color. If the color is saturated by 10%, you get
#67EEC7. If the color is desaturated by 10%, the color
#75E4C3 is obtained.