#BB3738#BB3738

#BB3738 is a mid, vivid red. Relative luminance 0.136; OKLCH L 53.4% C 0.169 H 24.5°. Best body text is #FFFFFF at 5.65:1 contrast (WCAG AA passes).

Color values

HEX	#BB3738
RGB	rgb(187, 55, 56)
HSL	hsl(360, 55%, 47%)
HSV	hsv(360, 71%, 73%)
CMYK	cmyk(0%, 70.6%, 70.1%, 26.7%)
CIE-LAB	lab(43.63, 52.61, 30.37)
CIE-LCH	lch(43.63, 60.75, 30.00°)
OKLab	oklab(53.44% 0.1535 0.0701)
OKLCH	oklch(53.44% 0.169 24.5)
XYZ	xyz(22.5760, 13.5860, 5.1742)
Luminance	0.1358 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#BB3738 #37BBBA

analogous

#BB377A #BB3738 #BB7837

triadic

#BB3738 #38BB37 #3738BB

tetradic

#BB3738 #7ABB37 #37BBBA #7837BB

square

#BB3738 #7ABB37 #37BBBA #7837BB

split-complementary

#BB3738 #37BB78 #377ABB

monochromatic

#5C1B1C #8C292A #BB3738 #D05F60 #DE8E8F

Accessibility & contrast

On white

5.65

#BB3738 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.72

#BB3738 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #BB3738

5.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##BB3738	#FFFFFF	#000000	##FFFFFF
##BB3738	1.00	5.65	3.72	5.65
#FFFFFF	5.65	1.00	21.00	1.00
#000000	3.72	21.00	1.00	21.00
##FFFFFF	5.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5C5537

Deuteranopia (green-blind)

#7D7234

Tritanopia (blue-blind)

#CE0839

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #bb3738;
/* rgb */ color: rgb(187, 55, 56);
/* oklch */ color: oklch(53.4% 0.169 24.5);

Tailwind

colors: {
  custom: {
    50: '#d7776f',
    500: '#bb3738',
    950: '#000000',
  },
}

SCSS

$custom: #bb3738;
$custom-light: #d7776f;
$custom-dark: #000000;

JSON

{
  "hex": "#bb3738",
  "rgb": {
    "r": 187,
    "g": 55,
    "b": 56
  },
  "hsl": {
    "h": 359.545,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.53438,
    "c": 0.16876,
    "h": 24.5
  },
  "luminance": 0.13583
}

Semantic roles & 50–950 ramp

primary

#BB3738

secondary

#85C9C8

accent

#DEDD4A

background

#FEF7F6

surface

#FCEEEC

border

#D5C9C7

text

#160907

muted

#847B7A

Preview Lab

Preview with #BB3738

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

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