#643B37#643B37

#643B37 is a dark, muted red. Relative luminance 0.061; OKLCH L 40.1% C 0.059 H 26.0°. Best body text is #FFFFFF at 9.45:1 contrast (WCAG AA passes).

Color values

HEX	#643B37
RGB	rgb(100, 59, 55)
HSL	hsl(5, 29%, 30%)
HSV	hsv(5, 45%, 39%)
CMYK	cmyk(0%, 41%, 45%, 60.8%)
CIE-LAB	lab(29.70, 17.58, 10.17)
CIE-LCH	lch(29.70, 20.31, 30.04°)
OKLab	oklab(40.06% 0.0529 0.0258)
OKLCH	oklch(40.06% 0.059 26)
XYZ	xyz(7.5095, 6.1137, 4.3983)
Luminance	0.0611 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#643B37 #376064

analogous

#643749 #643B37 #645137

triadic

#643B37 #37643B #3B3764

tetradic

#643B37 #496437 #376064 #513764

square

#643B37 #496437 #376064 #513764

split-complementary

#643B37 #376451 #374964

monochromatic

#150C0C #3D2421 #643B37 #8B524D #AC6F69

Accessibility & contrast

On white

9.45

#643B37 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#643B37 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #643B37

9.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##643B37	#FFFFFF	#000000	##FFFFFF
##643B37	1.00	9.45	2.22	9.45
#FFFFFF	9.45	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#444137

Deuteranopia (green-blind)

#4E4936

Tritanopia (blue-blind)

#6C363A

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #643b37;
/* rgb */ color: rgb(100, 59, 55);
/* oklch */ color: oklch(40.1% 0.059 26.0);

Tailwind

colors: {
  custom: {
    50: '#92716d',
    500: '#643b37',
    950: '#000000',
  },
}

SCSS

$custom: #643b37;
$custom-light: #92716d;
$custom-dark: #000000;

JSON

{
  "hex": "#643b37",
  "rgb": {
    "r": 100,
    "g": 59,
    "b": 55
  },
  "hsl": {
    "h": 5.333,
    "s": 29.032,
    "l": 30.392
  },
  "oklch": {
    "l": 0.40063,
    "c": 0.05891,
    "h": 26
  },
  "luminance": 0.06113
}

Semantic roles & 50–950 ramp

primary

#643B37

secondary

#629094

accent

#BDC562

background

#F9F6F6

surface

#F1ECEB

border

#CBC7C6

text

#0D0707

muted

#7E7A7A

Preview Lab

Preview with #643B37

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

Preview Lab → · Contrast checker → · Palette generator →