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 #210404 is the color #042121

The HSL model was used to determine the complementary color

Input Color

HEX #210404
RGB 33, 4, 4
CMYK 0%, 88%, 88%, 87%
HSL 0°, 78.38%, 7.25%

Complementary Color

HEX #042121
RGB 4, 33, 33
CMYK 88%, 0%, 0%, 87%
HSL 180°, 78.38%, 7.25%

Complementary color scheme

#042121

#040421

#210421

#210404

#212104