The hex color #81bde0 is a light color. The web-safe version is Hex
#99CCCC. A complementary color is
#7E421F. The grayscale version is
#B5B5B5. A 20% lighter version of the original color is
#B4F0FF, and Hex
#4E8AAD is the 20% darker color. If the color is saturated by 10%, you get
#7CBEE4. If the color is desaturated by 10%, the color
#86BCDC is obtained.