#581B1B#581B1B

#581B1B is a dark, moderate red. Relative luminance 0.029; OKLCH L 31.9% C 0.090 H 23.7°. Best body text is #FFFFFF at 13.23:1 contrast (WCAG AA passes).

Color values

HEX	#581B1B
RGB	rgb(88, 27, 27)
HSL	hsl(0, 53%, 23%)
HSV	hsv(0, 69%, 35%)
CMYK	cmyk(0%, 69.3%, 69.3%, 65.5%)
CIE-LAB	lab(19.80, 28.12, 15.30)
CIE-LCH	lch(19.80, 32.01, 28.56°)
OKLab	oklab(31.94% 0.0827 0.0364)
OKLCH	oklch(31.94% 0.09 23.7)
XYZ	xyz(4.6147, 2.9383, 1.3609)
Luminance	0.0294 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#581B1B #1B5858

analogous

#581B39 #581B1B #58391B

triadic

#581B1B #1B581B #1B1B58

tetradic

#581B1B #39581B #1B5858 #391B58

square

#581B1B #39581B #1B5858 #391B58

split-complementary

#581B1B #1B5839 #1B3958

monochromatic

#170707 #290D0D #581B1B #872929 #B63838

Accessibility & contrast

On white

13.23

#581B1B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.59

#581B1B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #581B1B

13.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##581B1B	#FFFFFF	#000000	##FFFFFF
##581B1B	1.00	13.23	1.59	13.23
#FFFFFF	13.23	1.00	21.00	1.00
#000000	1.59	21.00	1.00	21.00
##FFFFFF	13.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2B281A

Deuteranopia (green-blind)

#3A3519

Tritanopia (blue-blind)

#610D1C

Achromatopsia (no color)

#303030

Design tokens & code

CSS

--color: #581b1b;
/* rgb */ color: rgb(88, 27, 27);
/* oklch */ color: oklch(31.9% 0.090 23.7);

Tailwind

colors: {
  custom: {
    50: '#8c5b57',
    500: '#581b1b',
    950: '#000000',
  },
}

SCSS

$custom: #581b1b;
$custom-light: #8c5b57;
$custom-dark: #000000;

JSON

{
  "hex": "#581b1b",
  "rgb": {
    "r": 88,
    "g": 27,
    "b": 27
  },
  "hsl": {
    "h": 0,
    "s": 53.043,
    "l": 22.549
  },
  "oklch": {
    "l": 0.3194,
    "c": 0.09036,
    "h": 23.7
  },
  "luminance": 0.02938
}

Semantic roles & 50–950 ramp

primary

#581B1B

secondary

#418E8E

accent

#DCDC4B

background

#F9F5F5

surface

#F1E9E9

border

#CBC5C5

text

#0D0403

muted

#7E7978

Preview Lab

Preview with #581B1B

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

Preview Lab → · Contrast checker → · Palette generator →