#B33131#B33131

#B33131 is a mid, vivid red. Relative luminance 0.120; OKLCH L 51.3% C 0.167 H 25.3°. Best body text is #FFFFFF at 6.18:1 contrast (WCAG AA passes).

Color values

HEX	#B33131
RGB	rgb(179, 49, 49)
HSL	hsl(0, 57%, 45%)
HSV	hsv(0, 73%, 70%)
CMYK	cmyk(0%, 72.6%, 72.6%, 29.8%)
CIE-LAB	lab(41.22, 51.95, 31.32)
CIE-LCH	lch(41.22, 60.66, 31.09°)
OKLab	oklab(51.33% 0.1509 0.0713)
OKLCH	oklch(51.33% 0.167 25.3)
XYZ	xyz(20.2454, 12.0051, 4.1563)
Luminance	0.1200 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B33131 #31B3B3

analogous

#B33172 #B33131 #B37231

triadic

#B33131 #31B331 #3131B3

tetradic

#B33131 #72B331 #31B3B3 #7231B3

square

#B33131 #72B331 #31B3B3 #7231B3

split-complementary

#B33131 #31B372 #3172B3

monochromatic

#531717 #832424 #B33131 #D05252 #DD8282

Accessibility & contrast

On white

6.18

#B33131 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.40

#B33131 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B33131

6.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B33131	#FFFFFF	#000000	##FFFFFF
##B33131	1.00	6.18	3.40	6.18
#FFFFFF	6.18	1.00	21.00	1.00
#000000	3.40	21.00	1.00	21.00
##FFFFFF	6.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#574F30

Deuteranopia (green-blind)

#776B2D

Tritanopia (blue-blind)

#C50033

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #b33131;
/* rgb */ color: rgb(179, 49, 49);
/* oklch */ color: oklch(51.3% 0.167 25.3);

Tailwind

colors: {
  custom: {
    50: '#d27369',
    500: '#b33131',
    950: '#000000',
  },
}

SCSS

$custom: #b33131;
$custom-light: #d27369;
$custom-dark: #000000;

JSON

{
  "hex": "#b33131",
  "rgb": {
    "r": 179,
    "g": 49,
    "b": 49
  },
  "hsl": {
    "h": 0,
    "s": 57.018,
    "l": 44.706
  },
  "oklch": {
    "l": 0.51335,
    "c": 0.16692,
    "h": 25.3
  },
  "luminance": 0.12002
}

Semantic roles & 50–950 ramp

primary

#B33131

secondary

#7AC6C6

accent

#E0E048

background

#FEF7F6

surface

#FCEDEB

border

#D5C8C6

text

#160906

muted

#847B7A

Preview Lab

Preview with #B33131

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

Preview Lab → · Contrast checker → · Palette generator →