The hex color #3ee9f4 is a light color. The web-safe version is Hex
#33FFFF. A complementary color is
#C1160B. The grayscale version is
#B4B4B4. A 20% lighter version of the original color is
#71FFFF, and Hex
#0BB6C1 is the 20% darker color. If the color is saturated by 10%, you get
#32EEFA. If the color is desaturated by 10%, the color
#4AE4EE is obtained.