#631B2B#631B2B

#631B2B is a dark, moderate red. Relative luminance 0.036; OKLCH L 34.4% C 0.103 H 11.3°. Best body text is #FFFFFF at 12.19:1 contrast (WCAG AA passes).

Color values

HEX	#631B2B
RGB	rgb(99, 27, 43)
HSL	hsl(347, 57%, 25%)
HSV	hsv(347, 73%, 39%)
CMYK	cmyk(0%, 72.7%, 56.6%, 61.2%)
CIE-LAB	lab(22.34, 33.52, 8.02)
CIE-LCH	lch(22.34, 34.47, 13.46°)
OKLab	oklab(34.37% 0.1015 0.0203)
OKLCH	oklch(34.37% 0.104 11.3)
XYZ	xyz(5.9741, 3.6117, 2.6676)
Luminance	0.0361 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#631B2B #1B6353

analogous

#631B4F #631B2B #632F1B

triadic

#631B2B #2B631B #1B2B63

tetradic

#631B2B #4F631B #1B6353 #2F1B63

square

#631B2B #4F631B #1B6353 #2F1B63

split-complementary

#631B2B #1B632F #1B4F63

monochromatic

#18070A #330E16 #631B2B #932840 #C33555

Accessibility & contrast

On white

12.19

#631B2B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.72

#631B2B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #631B2B

12.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##631B2B	#FFFFFF	#000000	##FFFFFF
##631B2B	1.00	12.19	1.72	12.19
#FFFFFF	12.19	1.00	21.00	1.00
#000000	1.72	21.00	1.00	21.00
##FFFFFF	12.19	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2C2C2B

Deuteranopia (green-blind)

#3F3B29

Tritanopia (blue-blind)

#6D0D21

Achromatopsia (no color)

#353535

Design tokens & code

CSS

--color: #631b2b;
/* rgb */ color: rgb(99, 27, 43);
/* oklch */ color: oklch(34.4% 0.103 11.3);

Tailwind

colors: {
  custom: {
    50: '#945d64',
    500: '#631b2b',
    950: '#000000',
  },
}

SCSS

$custom: #631b2b;
$custom-light: #945d64;
$custom-dark: #000000;

JSON

{
  "hex": "#631b2b",
  "rgb": {
    "r": 99,
    "g": 27,
    "b": 43
  },
  "hsl": {
    "h": 346.667,
    "s": 57.143,
    "l": 24.706
  },
  "oklch": {
    "l": 0.34371,
    "c": 0.1035,
    "h": 11.3
  },
  "luminance": 0.03611
}

Semantic roles & 50–950 ramp

primary

#631B2B

secondary

#419885

accent

#E0BE47

background

#F9F5F5

surface

#F2E9EA

border

#CCC5C6

text

#0E0405

muted

#7E7979

Preview Lab

Preview with #631B2B

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

Preview Lab → · Contrast checker → · Palette generator →