#B63F37#B63F37

#B63F37 is a mid, vivid red. Relative luminance 0.138; OKLCH L 53.5% C 0.156 H 27.4°. Best body text is #FFFFFF at 5.59:1 contrast (WCAG AA passes).

Color values

HEX	#B63F37
RGB	rgb(182, 63, 55)
HSL	hsl(4, 54%, 46%)
HSV	hsv(4, 70%, 71%)
CMYK	cmyk(0%, 65.4%, 69.8%, 28.6%)
CIE-LAB	lab(43.91, 47.63, 31.08)
CIE-LCH	lch(43.91, 56.87, 33.13°)
OKLab	oklab(53.48% 0.1382 0.0717)
OKLCH	oklch(53.48% 0.156 27.4)
XYZ	xyz(21.7608, 13.7790, 5.1274)
Luminance	0.1378 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B63F37 #37AEB6

analogous

#B6376F #B63F37 #B67F37

triadic

#B63F37 #37B63F #3F37B6

tetradic

#B63F37 #6FB637 #37AEB6 #7F37B6

square

#B63F37 #6FB637 #37AEB6 #7F37B6

split-complementary

#B63F37 #37B67F #376FB6

monochromatic

#581E1B #872F29 #B63F37 #CE645C #DC908B

Accessibility & contrast

On white

5.59

#B63F37 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.76

#B63F37 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B63F37

5.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B63F37	#FFFFFF	#000000	##FFFFFF
##B63F37	1.00	5.59	3.76	5.59
#FFFFFF	5.59	1.00	21.00	1.00
#000000	3.76	21.00	1.00	21.00
##FFFFFF	5.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#605735

Deuteranopia (green-blind)

#7D7133

Tritanopia (blue-blind)

#C8213E

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #b63f37;
/* rgb */ color: rgb(182, 63, 55);
/* oklch */ color: oklch(53.5% 0.156 27.4);

Tailwind

colors: {
  custom: {
    50: '#d37a6e',
    500: '#b63f37',
    950: '#000000',
  },
}

SCSS

$custom: #b63f37;
$custom-light: #d37a6e;
$custom-dark: #000000;

JSON

{
  "hex": "#b63f37",
  "rgb": {
    "r": 182,
    "g": 63,
    "b": 55
  },
  "hsl": {
    "h": 3.78,
    "s": 53.586,
    "l": 46.471
  },
  "oklch": {
    "l": 0.53476,
    "c": 0.15569,
    "h": 27.4
  },
  "luminance": 0.13776
}

Semantic roles & 50–950 ramp

primary

#B63F37

secondary

#82C2C6

accent

#D4DD4B

background

#FEF7F6

surface

#FCEEEC

border

#D5C9C7

text

#160A07

muted

#847C7A

Preview Lab

Preview with #B63F37

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

Preview Lab → · Contrast checker → · Palette generator →