The hex color #34b9d0 is a light color. The web-safe version is Hex
#33CCCC. A complementary color is
#CB462F. The grayscale version is
#949494. A 20% lighter version of the original color is
#67ECFF, and Hex
#01869D is the 20% darker color. If the color is saturated by 10%, you get
#2ABDD6. If the color is desaturated by 10%, the color
#3EB5CA is obtained.