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 #121821 is the color #211B12

The HSL model was used to determine the complementary color

Input Color

HEX #121821
RGB 18, 24, 33
CMYK 45%, 27%, 0%, 87%
HSL 216°, 29.41%, 10%

Complementary Color

HEX #211B12
RGB 33, 27, 18
CMYK 0%, 18%, 45%, 87%
HSL 36°, 29.41%, 10%

Complementary color scheme

#211B12

#182112

#12211B

#121821

#1B1221