#37040B#37040B

#37040B is a very dark, moderate red. Relative luminance 0.009; OKLCH L 22.0% C 0.079 H 18.9°. Best body text is #FFFFFF at 17.73:1 contrast (WCAG AA passes).

Color values

HEX	#37040B
RGB	rgb(55, 4, 11)
HSL	hsl(352, 86%, 12%)
HSV	hsv(352, 93%, 22%)
CMYK	cmyk(0%, 92.7%, 80%, 78.4%)
CIE-LAB	lab(8.34, 25.33, 8.56)
CIE-LCH	lch(8.34, 26.74, 18.67°)
OKLab	oklab(21.97% 0.075 0.0256)
OKLCH	oklch(21.97% 0.079 18.9)
XYZ	xyz(1.6796, 0.9235, 0.4064)
Luminance	0.0092 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#37040B #043730

analogous

#370425 #37040B #371704

triadic

#37040B #0B3704 #040B37

tetradic

#37040B #253704 #043730 #170437

square

#37040B #253704 #043730 #170437

split-complementary

#37040B #043717 #042537

monochromatic

#1D0206 #1D0206 #37040B #700816 #A90C22

Accessibility & contrast

On white

17.73

#37040B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.18

#37040B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #37040B

17.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##37040B	#FFFFFF	#000000	##FFFFFF
##37040B	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)

#13110B

Deuteranopia (green-blind)

#201C09

Tritanopia (blue-blind)

#3D0007

Achromatopsia (no color)

#181818

Design tokens & code

CSS

--color: #37040b;
/* rgb */ color: rgb(55, 4, 11);
/* oklch */ color: oklch(22.0% 0.079 18.9);

Tailwind

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

SCSS

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

JSON

{
  "hex": "#37040b",
  "rgb": {
    "r": 55,
    "g": 4,
    "b": 11
  },
  "hsl": {
    "h": 351.765,
    "s": 86.441,
    "l": 11.569
  },
  "oklch": {
    "l": 0.21971,
    "c": 0.07923,
    "h": 18.9
  },
  "luminance": 0.00923
}

Semantic roles & 50–950 ramp

primary

#37040B

secondary

#1E796D

accent

#FDE02B

background

#F7F4F4

surface

#EDE7E7

border

#C8C3C3

text

#090101

muted

#7B7777

Preview Lab

Preview with #37040B

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

Preview Lab → · Contrast checker → · Palette generator →