How to determine complementary colors?

What are the different color models?

Determine Complementary Color

140 color names

216 web safe colors

2040 RAL colors

200 shades of gray

The complementary color of #404040 is the color #BFBFBF

The RGB model was used to determine the complementary color

Input Color

HEX #404040
RGB 64, 64, 64
CMYK 0%, 0%, 0%, 75%
HSL 0°, 0%, 25.1%

Complementary Color

HEX #BFBFBF
RGB 191, 191, 191
CMYK 0%, 0%, 0%, 25%
HSL 0°, 0%, 74.9%

Possible color scheme

#404040

#4040FF

#40FF40

#868686

#BFBFBF

#FF4040

#FFFF99