#BB3737#BB3737

#BB3737 is a mid, vivid red. Relative luminance 0.136; OKLCH L 53.4% C 0.169 H 24.9°. Best body text is #FFFFFF at 5.65:1 contrast (WCAG AA passes).

Color values

HEX	#BB3737
RGB	rgb(187, 55, 55)
HSL	hsl(0, 55%, 47%)
HSV	hsv(0, 71%, 73%)
CMYK	cmyk(0%, 70.6%, 70.6%, 26.7%)
CIE-LAB	lab(43.62, 52.56, 30.95)
CIE-LCH	lch(43.62, 61.00, 30.49°)
OKLab	oklab(53.42% 0.1531 0.0712)
OKLCH	oklch(53.42% 0.169 24.9)
XYZ	xyz(22.5518, 13.5764, 5.0467)
Luminance	0.1357 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#BB3737 #37BBBB

analogous

#BB3779 #BB3737 #BB7937

triadic

#BB3737 #37BB37 #3737BB

tetradic

#BB3737 #79BB37 #37BBBB #7937BB

square

#BB3737 #79BB37 #37BBBB #7937BB

split-complementary

#BB3737 #37BB79 #3779BB

monochromatic

#5C1B1B #8C2929 #BB3737 #D05F5F #DE8E8E

Accessibility & contrast

On white

5.65

#BB3737 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.71

#BB3737 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #BB3737

5.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##BB3737	#FFFFFF	#000000	##FFFFFF
##BB3737	1.00	5.65	3.71	5.65
#FFFFFF	5.65	1.00	21.00	1.00
#000000	3.71	21.00	1.00	21.00
##FFFFFF	5.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5C5536

Deuteranopia (green-blind)

#7D7133

Tritanopia (blue-blind)

#CE0739

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #bb3737;
/* rgb */ color: rgb(187, 55, 55);
/* oklch */ color: oklch(53.4% 0.169 24.9);

Tailwind

colors: {
  custom: {
    50: '#d7776e',
    500: '#bb3737',
    950: '#000000',
  },
}

SCSS

$custom: #bb3737;
$custom-light: #d7776e;
$custom-dark: #000000;

JSON

{
  "hex": "#bb3737",
  "rgb": {
    "r": 187,
    "g": 55,
    "b": 55
  },
  "hsl": {
    "h": 0,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.53422,
    "c": 0.16889,
    "h": 24.9
  },
  "luminance": 0.13573
}

Semantic roles & 50–950 ramp

primary

#BB3737

secondary

#85C9C9

accent

#DEDE4A

background

#FEF7F6

surface

#FCEEEB

border

#D5C9C6

text

#160907

muted

#847B7A

Preview Lab

Preview with #BB3737

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

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