#643E37#643E37

#643E37 is a dark, muted red. Relative luminance 0.064; OKLCH L 40.7% C 0.055 H 31.0°. Best body text is #FFFFFF at 9.19:1 contrast (WCAG AA passes).

Color values

HEX	#643E37
RGB	rgb(100, 62, 55)
HSL	hsl(9, 29%, 30%)
HSV	hsv(9, 45%, 39%)
CMYK	cmyk(0%, 38%, 45%, 60.8%)
CIE-LAB	lab(30.47, 15.73, 11.23)
CIE-LCH	lch(30.47, 19.33, 35.53°)
OKLab	oklab(40.66% 0.0473 0.0284)
OKLCH	oklch(40.66% 0.055 31)
XYZ	xyz(7.6681, 6.4310, 4.4511)
Luminance	0.0643 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643E37 #375D64

analogous

#643746 #643E37 #645437

triadic

#643E37 #37643E #3E3764

tetradic

#643E37 #466437 #375D64 #543764

square

#643E37 #466437 #375D64 #543764

split-complementary

#643E37 #376454 #374664

monochromatic

#150D0C #3D2621 #643E37 #8B564D #AC7369

Accessibility & contrast

On white

9.19

#643E37 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.29

#643E37 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643E37

9.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643E37	#FFFFFF	#000000	##FFFFFF
##643E37	1.00	9.19	2.29	9.19
#FFFFFF	9.19	1.00	21.00	1.00
#000000	2.29	21.00	1.00	21.00
##FFFFFF	9.19	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#474336

Deuteranopia (green-blind)

#504B37

Tritanopia (blue-blind)

#6C393C

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #643e37;
/* rgb */ color: rgb(100, 62, 55);
/* oklch */ color: oklch(40.7% 0.055 31.0);

Tailwind

colors: {
  custom: {
    50: '#92736d',
    500: '#643e37',
    950: '#000000',
  },
}

SCSS

$custom: #643e37;
$custom-light: #92736d;
$custom-dark: #000000;

JSON

{
  "hex": "#643e37",
  "rgb": {
    "r": 100,
    "g": 62,
    "b": 55
  },
  "hsl": {
    "h": 9.333,
    "s": 29.032,
    "l": 30.392
  },
  "oklch": {
    "l": 0.4066,
    "c": 0.0552,
    "h": 31
  },
  "luminance": 0.0643
}

Semantic roles & 50–950 ramp

primary

#643E37

secondary

#628D94

accent

#B6C562

background

#F9F7F6

surface

#F1EDEB

border

#CBC8C6

text

#0D0807

muted

#7E7B7A

Preview Lab

Preview with #643E37

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

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