#B4183B#B4183B

#B4183B is a mid, vivid red. Relative luminance 0.107; OKLCH L 49.8% C 0.186 H 16.7°. Best body text is #FFFFFF at 6.70:1 contrast (WCAG AA passes).

Color values

HEX	#B4183B
RGB	rgb(180, 24, 59)
HSL	hsl(347, 76%, 40%)
HSV	hsv(347, 87%, 71%)
CMYK	cmyk(0%, 86.7%, 67.2%, 29.4%)
CIE-LAB	lab(39.03, 59.91, 22.56)
CIE-LCH	lch(39.03, 64.02, 20.63°)
OKLab	oklab(49.79% 0.1785 0.0534)
OKLCH	oklch(49.79% 0.186 16.7)
XYZ	xyz(19.9407, 10.6755, 5.1474)
Luminance	0.1067 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B4183B #18B491

analogous

#B41889 #B4183B #B44318

triadic

#B4183B #3BB418 #183BB4

tetradic

#B4183B #89B418 #18B491 #4318B4

square

#B4183B #89B418 #18B491 #4318B4

split-complementary

#B4183B #18B443 #1889B4

monochromatic

#480A18 #7E1129 #B4183B #E22751 #E95D7D

Accessibility & contrast

On white

6.70

#B4183B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.13

#B4183B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B4183B

6.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B4183B	#FFFFFF	#000000	##FFFFFF
##B4183B	1.00	6.70	3.13	6.70
#FFFFFF	6.70	1.00	21.00	1.00
#000000	3.13	21.00	1.00	21.00
##FFFFFF	6.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4B473B

Deuteranopia (green-blind)

#716736

Tritanopia (blue-blind)

#C60029

Achromatopsia (no color)

#5C5C5C

Design tokens & code

CSS

--color: #b4183b;
/* rgb */ color: rgb(180, 24, 59);
/* oklch */ color: oklch(49.8% 0.186 16.7);

Tailwind

colors: {
  custom: {
    50: '#d36a70',
    500: '#b4183b',
    950: '#000000',
  },
}

SCSS

$custom: #b4183b;
$custom-light: #d36a70;
$custom-dark: #000000;

JSON

{
  "hex": "#b4183b",
  "rgb": {
    "r": 180,
    "g": 24,
    "b": 59
  },
  "hsl": {
    "h": 346.538,
    "s": 76.471,
    "l": 40
  },
  "oklch": {
    "l": 0.49792,
    "c": 0.18627,
    "h": 16.7
  },
  "luminance": 0.10672
}

Semantic roles & 50–950 ramp

primary

#B4183B

secondary

#5BCDB4

accent

#F3C835

background

#FEF6F6

surface

#FCECEC

border

#D5C7C7

text

#160707

muted

#847A7A

Preview Lab

Preview with #B4183B

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

Preview Lab → · Contrast checker → · Palette generator →