The hex color #51aeb9 is a light color. The web-safe version is Hex
#6699CC. A complementary color is
#AE5146. The grayscale version is
#939393. A 20% lighter version of the original color is
#84E1EC, and Hex
#1E7B86 is the 20% darker color. If the color is saturated by 10%, you get
#4AB1BD. If the color is desaturated by 10%, the color
#58ABB5 is obtained.