#370B0B#370B0B

#370B0B is a very dark, moderate red. Relative luminance 0.011; OKLCH L 22.9% C 0.070 H 24.5°. Best body text is #FFFFFF at 17.28:1 contrast (WCAG AA passes).

Color values

HEX	#370B0B
RGB	rgb(55, 11, 11)
HSL	hsl(0, 67%, 13%)
HSV	hsv(0, 80%, 22%)
CMYK	cmyk(0%, 80%, 80%, 78.4%)
CIE-LAB	lab(9.61, 21.79, 10.39)
CIE-LCH	lch(9.61, 24.14, 25.50°)
OKLab	oklab(22.92% 0.0637 0.0291)
OKLCH	oklch(22.92% 0.07 24.5)
XYZ	xyz(1.7558, 1.0760, 0.4318)
Luminance	0.0108 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#370B0B #0B3737

analogous

#370B21 #370B0B #37210B

triadic

#370B0B #0B370B #0B0B37

tetradic

#370B0B #21370B #0B3737 #210B37

square

#370B0B #21370B #0B3737 #210B37

split-complementary

#370B0B #0B3721 #0B2137

monochromatic

#1A0505 #1A0505 #370B0B #6A1515 #9D1F1F

Accessibility & contrast

On white

17.28

#370B0B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.22

#370B0B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #370B0B

17.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##370B0B	#FFFFFF	#000000	##FFFFFF
##370B0B	1.00	17.28	1.22	17.28
#FFFFFF	17.28	1.00	21.00	1.00
#000000	1.22	21.00	1.00	21.00
##FFFFFF	17.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#17150B

Deuteranopia (green-blind)

#221E0A

Tritanopia (blue-blind)

#3D020C

Achromatopsia (no color)

#1B1B1B

Design tokens & code

CSS

--color: #370b0b;
/* rgb */ color: rgb(55, 11, 11);
/* oklch */ color: oklch(22.9% 0.070 24.5);

Tailwind

colors: {
  custom: {
    50: '#724d4b',
    500: '#370b0b',
    950: '#000000',
  },
}

SCSS

$custom: #370b0b;
$custom-light: #724d4b;
$custom-dark: #000000;

JSON

{
  "hex": "#370b0b",
  "rgb": {
    "r": 55,
    "g": 11,
    "b": 11
  },
  "hsl": {
    "h": 0,
    "s": 66.667,
    "l": 12.941
  },
  "oklch": {
    "l": 0.22917,
    "c": 0.07003,
    "h": 24.5
  },
  "luminance": 0.01076
}

Semantic roles & 50–950 ramp

primary

#370B0B

secondary

#2A7474

accent

#EAEA3E

background

#F7F4F4

surface

#EDE7E7

border

#C8C3C3

text

#080101

muted

#7B7777

Preview Lab

Preview with #370B0B

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

Preview Lab → · Contrast checker → · Palette generator →