The hex color #f5501b is a dark color. The web-safe version is Hex
#FF6633. A complementary color is
#0AAFE4. The grayscale version is
#757575. A 20% lighter version of the original color is
#FF834E, and Hex
#C21D00 is the 20% darker color. If the color is saturated by 10%, you get
#FF4C12. If the color is desaturated by 10%, the color
#E85424 is obtained.