The hex color #ddf428 is a light color. The web-safe version is Hex
#CCFF33. A complementary color is
#220BD7. The grayscale version is
#A8A8A8. A 20% lighter version of the original color is
#FFFF5B, and Hex
#AAC100 is the 20% darker color. If the color is saturated by 10%, you get
#E2FC1B. If the color is desaturated by 10%, the color
#D8EC35 is obtained.