#37040A#37040A

#37040A is a very dark, moderate red. Relative luminance 0.009; OKLCH L 21.9% C 0.079 H 20.0°. Best body text is #FFFFFF at 17.73:1 contrast (WCAG AA passes).

Color values

HEX	#37040A
RGB	rgb(55, 4, 10)
HSL	hsl(353, 86%, 12%)
HSV	hsv(353, 93%, 22%)
CMYK	cmyk(0%, 92.7%, 81.8%, 78.4%)
CIE-LAB	lab(8.32, 25.27, 8.95)
CIE-LCH	lch(8.32, 26.81, 19.50°)
OKLab	oklab(21.95% 0.0745 0.0271)
OKLCH	oklch(21.95% 0.079 20)
XYZ	xyz(1.6739, 0.9212, 0.3768)
Luminance	0.0092 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#37040A #043731

analogous

#370424 #37040A #371804

triadic

#37040A #0A3704 #040A37

tetradic

#37040A #243704 #043731 #180437

square

#37040A #243704 #043731 #180437

split-complementary

#37040A #043718 #042437

monochromatic

#1D0205 #1D0205 #37040A #700814 #A90C1F

Accessibility & contrast

On white

17.73

#37040A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.18

#37040A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #37040A

17.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##37040A	#FFFFFF	#000000	##FFFFFF
##37040A	1.00	17.73	1.18	17.73
#FFFFFF	17.73	1.00	21.00	1.00
#000000	1.18	21.00	1.00	21.00
##FFFFFF	17.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#13110A

Deuteranopia (green-blind)

#201C08

Tritanopia (blue-blind)

#3D0006

Achromatopsia (no color)

#181818

Design tokens & code

CSS

--color: #37040a;
/* rgb */ color: rgb(55, 4, 10);
/* oklch */ color: oklch(21.9% 0.079 20.0);

Tailwind

colors: {
  custom: {
    50: '#72494b',
    500: '#37040a',
    950: '#000000',
  },
}

SCSS

$custom: #37040a;
$custom-light: #72494b;
$custom-dark: #000000;

JSON

{
  "hex": "#37040a",
  "rgb": {
    "r": 55,
    "g": 4,
    "b": 10
  },
  "hsl": {
    "h": 352.941,
    "s": 86.441,
    "l": 11.569
  },
  "oklch": {
    "l": 0.2195,
    "c": 0.07927,
    "h": 20
  },
  "luminance": 0.00921
}

Semantic roles & 50–950 ramp

primary

#37040A

secondary

#1E796E

accent

#FDE42B

background

#F7F4F4

surface

#EDE7E7

border

#C8C3C3

text

#090101

muted

#7B7777

Preview Lab

Preview with #37040A

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

Preview Lab → · Contrast checker → · Palette generator →