#643F37#643F37

#643F37 is a dark, muted red. Relative luminance 0.065; OKLCH L 40.9% C 0.054 H 32.8°. Best body text is #FFFFFF at 9.10:1 contrast (WCAG AA passes).

Color values

HEX	#643F37
RGB	rgb(100, 63, 55)
HSL	hsl(11, 29%, 30%)
HSV	hsv(11, 45%, 39%)
CMYK	cmyk(0%, 37%, 45%, 60.8%)
CIE-LAB	lab(30.74, 15.11, 11.59)
CIE-LCH	lch(30.74, 19.04, 37.50°)
OKLab	oklab(40.86% 0.0455 0.0293)
OKLCH	oklch(40.86% 0.054 32.8)
XYZ	xyz(7.7230, 6.5408, 4.4694)
Luminance	0.0654 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643F37 #375C64

analogous

#643745 #643F37 #645537

triadic

#643F37 #37643F #3F3764

tetradic

#643F37 #456437 #375C64 #553764

square

#643F37 #456437 #375C64 #553764

split-complementary

#643F37 #376455 #374564

monochromatic

#150D0C #3D2621 #643F37 #8B584D #AC7569

Accessibility & contrast

On white

9.10

#643F37 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.31

#643F37 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643F37

9.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643F37	#FFFFFF	#000000	##FFFFFF
##643F37	1.00	9.10	2.31	9.10
#FFFFFF	9.10	1.00	21.00	1.00
#000000	2.31	21.00	1.00	21.00
##FFFFFF	9.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#474436

Deuteranopia (green-blind)

#504B37

Tritanopia (blue-blind)

#6C3A3D

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #643f37;
/* rgb */ color: rgb(100, 63, 55);
/* oklch */ color: oklch(40.9% 0.054 32.8);

Tailwind

colors: {
  custom: {
    50: '#92746d',
    500: '#643f37',
    950: '#000000',
  },
}

SCSS

$custom: #643f37;
$custom-light: #92746d;
$custom-dark: #000000;

JSON

{
  "hex": "#643f37",
  "rgb": {
    "r": 100,
    "g": 63,
    "b": 55
  },
  "hsl": {
    "h": 10.667,
    "s": 29.032,
    "l": 30.392
  },
  "oklch": {
    "l": 0.40862,
    "c": 0.05406,
    "h": 32.8
  },
  "luminance": 0.0654
}

Semantic roles & 50–950 ramp

primary

#643F37

secondary

#628C94

accent

#B4C562

background

#F9F7F6

surface

#F1EDEB

border

#CBC8C6

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643F37

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

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