#B3311D#B3311D

#B3311D is a mid, vivid red. Relative luminance 0.119; OKLCH L 51.1% C 0.170 H 31.7°. Best body text is #FFFFFF at 6.22:1 contrast (WCAG AA passes).

Color values

HEX	#B3311D
RGB	rgb(179, 49, 29)
HSL	hsl(8, 72%, 41%)
HSV	hsv(8, 84%, 70%)
CMYK	cmyk(0%, 72.6%, 83.8%, 29.8%)
CIE-LAB	lab(41.01, 51.22, 42.18)
CIE-LCH	lch(41.01, 66.35, 39.47°)
OKLab	oklab(51.11% 0.1446 0.0891)
OKLCH	oklch(51.11% 0.17 31.7)
XYZ	xyz(19.9129, 11.8721, 2.4052)
Luminance	0.1187 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B3311D #1D9FB3

analogous

#B31D54 #B3311D #B37C1D

triadic

#B3311D #1DB331 #311DB3

tetradic

#B3311D #54B31D #1D9FB3 #7C1DB3

square

#B3311D #54B31D #1D9FB3 #7C1DB3

split-complementary

#B3311D #1DB37C #1D54B3

monochromatic

#4A140C #7E2314 #B3311D #DD4730 #E67664

Accessibility & contrast

On white

6.22

#B3311D on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.37

#B3311D on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B3311D

6.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B3311D	#FFFFFF	#000000	##FFFFFF
##B3311D	1.00	6.22	3.37	6.22
#FFFFFF	6.22	1.00	21.00	1.00
#000000	3.37	21.00	1.00	21.00
##FFFFFF	6.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#584E19

Deuteranopia (green-blind)

#786B16

Tritanopia (blue-blind)

#C5002E

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #b3311d;
/* rgb */ color: rgb(179, 49, 29);
/* oklch */ color: oklch(51.1% 0.170 31.7);

Tailwind

colors: {
  custom: {
    50: '#d3725b',
    500: '#b3311d',
    950: '#000000',
  },
}

SCSS

$custom: #b3311d;
$custom-light: #d3725b;
$custom-dark: #000000;

JSON

{
  "hex": "#b3311d",
  "rgb": {
    "r": 179,
    "g": 49,
    "b": 29
  },
  "hsl": {
    "h": 8,
    "s": 72.115,
    "l": 40.784
  },
  "oklch": {
    "l": 0.5111,
    "c": 0.16987,
    "h": 31.7
  },
  "luminance": 0.11869
}

Semantic roles & 50–950 ramp

primary

#B3311D

secondary

#61BDCB

accent

#D7EF39

background

#FEF7F5

surface

#FCEDE9

border

#D5C8C5

text

#160804

muted

#847B79

Preview Lab

Preview with #B3311D

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

Preview Lab → · Contrast checker → · Palette generator →