#B63737#B63737

#B63737 is a mid, vivid red. Relative luminance 0.130; OKLCH L 52.6% C 0.164 H 24.8°. Best body text is #FFFFFF at 5.85:1 contrast (WCAG AA passes).

Color values

HEX#B63737
RGBrgb(182, 55, 55)
HSLhsl(0, 54%, 46%)
HSVhsv(0, 70%, 71%)
CMYKcmyk(0%, 69.8%, 69.8%, 28.6%)
CIE-LABlab(42.70, 50.93, 29.63)
CIE-LCHlch(42.70, 58.92, 30.19°)
OKLaboklab(52.57% 0.1486 0.0685)
OKLCHoklch(52.57% 0.164 24.8)
XYZxyz(21.3495, 12.9564, 4.9904)
Luminance0.1295 (WCAG relative)
Temperaturewarm
Familyred

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary
#B63737 #37B6B6
analogous
#B63777 #B63737 #B67737
triadic
#B63737 #37B637 #3737B6
tetradic
#B63737 #77B637 #37B6B6 #7737B6
square
#B63737 #77B637 #37B6B6 #7737B6
split-complementary
#B63737 #37B677 #3777B6
monochromatic
#581B1B #872929 #B63737 #CE5C5C #DC8B8B

Accessibility & contrast

On white

5.85
#B63737 on #FFFFFF
AA ✓AA large ✓AAA ✗

On black

3.59
#B63737 on #000000
AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B63737
5.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg##B63737#FFFFFF#000000##FFFFFF
##B637371.005.853.595.85
#FFFFFF5.851.0021.001.00
#0000003.5921.001.0021.00
##FFFFFF5.851.0021.001.00

Color blindness preview

Protanopia (red-blind)
#5B5336
Deuteranopia (green-blind)
#7A6F33
Tritanopia (blue-blind)
#C80E39
Achromatopsia (no color)
#656565

Design tokens & code

CSS
--color: #b63737;
/* rgb */ color: rgb(182, 55, 55);
/* oklch */ color: oklch(52.6% 0.164 24.8);
Tailwind
colors: {
  custom: {
    50: '#d4766e',
    500: '#b63737',
    950: '#000000',
  },
}
SCSS
$custom: #b63737;
$custom-light: #d4766e;
$custom-dark: #000000;
JSON
{
  "hex": "#b63737",
  "rgb": {
    "r": 182,
    "g": 55,
    "b": 55
  },
  "hsl": {
    "h": 0,
    "s": 53.586,
    "l": 46.471
  },
  "oklch": {
    "l": 0.52565,
    "c": 0.16366,
    "h": 24.8
  },
  "luminance": 0.12953
}

Semantic roles & 50–950 ramp

primary
#B63737
secondary
#82C6C6
accent
#DDDD4B
background
#FEF7F6
surface
#FCEDEB
border
#D5C8C6
text
#160907
muted
#847B7A

Preview Lab

Preview with #B63737

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

Preview Lab → · Contrast checker → · Palette generator →

#B63737 Color — HEX, RGB, HSL, OKLCH & Contrast — Tintiva