#BB3739#BB3739

#BB3739 is a mid, vivid red. Relative luminance 0.136; OKLCH L 53.5% C 0.169 H 24.2°. Best body text is #FFFFFF at 5.65:1 contrast (WCAG AA passes).

Color values

HEX	#BB3739
RGB	rgb(187, 55, 57)
HSL	hsl(359, 55%, 47%)
HSV	hsv(359, 71%, 73%)
CMYK	cmyk(0%, 70.6%, 69.5%, 26.7%)
CIE-LAB	lab(43.65, 52.66, 29.80)
CIE-LCH	lch(43.65, 60.51, 29.50°)
OKLab	oklab(53.45% 0.1539 0.069)
OKLCH	oklch(53.45% 0.169 24.2)
XYZ	xyz(22.6007, 13.5959, 5.3043)
Luminance	0.1359 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#BB3739 #37BBB9

analogous

#BB377B #BB3739 #BB7737

triadic

#BB3739 #39BB37 #3739BB

tetradic

#BB3739 #7BBB37 #37BBB9 #7737BB

square

#BB3739 #7BBB37 #37BBB9 #7737BB

split-complementary

#BB3739 #37BB77 #377BBB

monochromatic

#5C1B1C #8C292B #BB3739 #D05F61 #DE8E90

Accessibility & contrast

On white

5.65

#BB3739 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.72

#BB3739 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #BB3739

5.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##BB3739	#FFFFFF	#000000	##FFFFFF
##BB3739	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)

#5C5538

Deuteranopia (green-blind)

#7D7235

Tritanopia (blue-blind)

#CD0939

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #bb3739;
/* rgb */ color: rgb(187, 55, 57);
/* oklch */ color: oklch(53.5% 0.169 24.2);

Tailwind

colors: {
  custom: {
    50: '#d7776f',
    500: '#bb3739',
    950: '#000000',
  },
}

SCSS

$custom: #bb3739;
$custom-light: #d7776f;
$custom-dark: #000000;

JSON

{
  "hex": "#bb3739",
  "rgb": {
    "r": 187,
    "g": 55,
    "b": 57
  },
  "hsl": {
    "h": 359.091,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.53453,
    "c": 0.16865,
    "h": 24.2
  },
  "luminance": 0.13593
}

Semantic roles & 50–950 ramp

primary

#BB3739

secondary

#85C9C8

accent

#DEDC4A

background

#FEF7F6

surface

#FCEEEC

border

#D5C9C7

text

#160907

muted

#847B7A

Preview Lab

Preview with #BB3739

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

Preview Lab → · Contrast checker → · Palette generator →