The hex color #00c4e3 is a light color. The web-safe version is Hex
#00CCCC. A complementary color is
#FF3B1C. The grayscale version is
#8D8D8D. A 20% lighter version of the original color is
#33F7FF, and Hex
#0091B0 is the 20% darker color. If the color is saturated by 10%, you get
#00CAEC. If the color is desaturated by 10%, the color
#0EBFDA is obtained.