The hex color #3fcea0 is a light color. The web-safe version is Hex
#33CC99. A complementary color is
#C0315F. The grayscale version is
#8F8F8F. A 20% lighter version of the original color is
#72FFD3, and Hex
#0C9B6D is the 20% darker color. If the color is saturated by 10%, you get
#37D4A2. If the color is desaturated by 10%, the color
#47C89E is obtained.