#63181B#63181B

#63181B is a dark, moderate red. Relative luminance 0.034; OKLCH L 33.7% C 0.107 H 23.0°. Best body text is #FFFFFF at 12.52:1 contrast (WCAG AA passes).

Color values

HEX	#63181B
RGB	rgb(99, 24, 27)
HSL	hsl(358, 61%, 24%)
HSV	hsv(358, 76%, 39%)
CMYK	cmyk(0%, 75.8%, 72.7%, 61.2%)
CIE-LAB	lab(21.53, 33.62, 17.94)
CIE-LCH	lch(21.53, 38.11, 28.09°)
OKLab	oklab(33.65% 0.0986 0.0418)
OKLCH	oklch(33.65% 0.107 23)
XYZ	xyz(5.6707, 3.3859, 1.3916)
Luminance	0.0338 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#63181B #186360

analogous

#631841 #63181B #633B18

triadic

#63181B #1B6318 #181B63

tetradic

#63181B #416318 #186360 #3B1863

square

#63181B #416318 #186360 #3B1863

split-complementary

#63181B #18633B #184163

monochromatic

#190607 #320C0E #63181B #942428 #C63036

Accessibility & contrast

On white

12.52

#63181B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.68

#63181B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #63181B

12.52:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##63181B	#FFFFFF	#000000	##FFFFFF
##63181B	1.00	12.52	1.68	12.52
#FFFFFF	12.52	1.00	21.00	1.00
#000000	1.68	21.00	1.00	21.00
##FFFFFF	12.52	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2D291A

Deuteranopia (green-blind)

#403919

Tritanopia (blue-blind)

#6D011A

Achromatopsia (no color)

#343434

Design tokens & code

CSS

--color: #63181b;
/* rgb */ color: rgb(99, 24, 27);
/* oklch */ color: oklch(33.7% 0.107 23.0);

Tailwind

colors: {
  custom: {
    50: '#955b57',
    500: '#63181b',
    950: '#000000',
  },
}

SCSS

$custom: #63181b;
$custom-light: #955b57;
$custom-dark: #000000;

JSON

{
  "hex": "#63181b",
  "rgb": {
    "r": 99,
    "g": 24,
    "b": 27
  },
  "hsl": {
    "h": 357.6,
    "s": 60.976,
    "l": 24.118
  },
  "oklch": {
    "l": 0.33651,
    "c": 0.1071,
    "h": 23
  },
  "luminance": 0.03385
}

Semantic roles & 50–950 ramp

primary

#63181B

secondary

#3E9996

accent

#E4DE44

background

#F9F5F5

surface

#F2E9E9

border

#CCC5C5

text

#0E0403

muted

#7E7978

Preview Lab

Preview with #63181B

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

Preview Lab → · Contrast checker → · Palette generator →