#21040B#21040B

#21040B is a very dark, muted red. Relative luminance 0.004; OKLCH L 17.0% C 0.053 H 7.9°. Best body text is #FFFFFF at 19.32:1 contrast (WCAG AA passes).

Color values

HEX	#21040B
RGB	rgb(33, 4, 11)
HSL	hsl(346, 78%, 7%)
HSV	hsv(346, 88%, 13%)
CMYK	cmyk(0%, 87.9%, 66.7%, 87.1%)
CIE-LAB	lab(3.92, 13.04, 1.59)
CIE-LCH	lch(3.92, 13.13, 6.95°)
OKLab	oklab(16.99% 0.0521 0.0072)
OKLCH	oklch(16.99% 0.053 7.9)
XYZ	xyz(0.7311, 0.4344, 0.3619)
Luminance	0.0043 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#21040B #04211A

analogous

#21041A #21040B #210C04

triadic

#21040B #0B2104 #040B21

tetradic

#21040B #1A2104 #04211A #0C0421

square

#21040B #1A2104 #04211A #0C0421

split-complementary

#21040B #04210C #041A21

monochromatic

#1B0309 #1B0309 #21040B #580B1D #8E112F

Accessibility & contrast

On white

19.32

#21040B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.09

#21040B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #21040B

19.32:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##21040B	#FFFFFF	#000000	##FFFFFF
##21040B	1.00	19.32	1.09	19.32
#FFFFFF	19.32	1.00	21.00	1.00
#000000	1.09	21.00	1.00	21.00
##FFFFFF	19.32	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0A0A0B

Deuteranopia (green-blind)

#12100A

Tritanopia (blue-blind)

#250106

Achromatopsia (no color)

#0E0E0E

Design tokens & code

CSS

--color: #21040b;
/* rgb */ color: rgb(33, 4, 11);
/* oklch */ color: oklch(17.0% 0.053 7.9);

Tailwind

colors: {
  custom: {
    50: '#5c484c',
    500: '#21040b',
    950: '#000000',
  },
}

SCSS

$custom: #21040b;
$custom-light: #5c484c;
$custom-dark: #000000;

JSON

{
  "hex": "#21040b",
  "rgb": {
    "r": 33,
    "g": 4,
    "b": 11
  },
  "hsl": {
    "h": 345.517,
    "s": 78.378,
    "l": 7.255
  },
  "oklch": {
    "l": 0.16993,
    "c": 0.05259,
    "h": 7.9
  },
  "luminance": 0.00434
}

Semantic roles & 50–950 ramp

primary

#21040B

secondary

#1D6453

accent

#F5C633

background

#F5F4F4

surface

#E9E6E7

border

#C5C2C3

text

#040001

muted

#797777

Preview Lab

Preview with #21040B

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →