#B5303B#B5303B

#B5303B is a mid, vivid red. Relative luminance 0.123; OKLCH L 51.7% C 0.169 H 21.1°. Best body text is #FFFFFF at 6.09:1 contrast (WCAG AA passes).

Color values

HEX	#B5303B
RGB	rgb(181, 48, 59)
HSL	hsl(355, 58%, 45%)
HSV	hsv(355, 73%, 71%)
CMYK	cmyk(0%, 73.5%, 67.4%, 29%)
CIE-LAB	lab(41.62, 53.45, 25.86)
CIE-LCH	lch(41.62, 59.37, 25.82°)
OKLab	oklab(51.75% 0.1576 0.0608)
OKLCH	oklch(51.75% 0.169 21.1)
XYZ	xyz(20.9047, 12.2565, 5.4018)
Luminance	0.1225 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B5303B #30B5AA

analogous

#B5307D #B5303B #B56830

triadic

#B5303B #3BB530 #303BB5

tetradic

#B5303B #7DB530 #30B5AA #6830B5

square

#B5303B #7DB530 #30B5AA #6830B5

split-complementary

#B5303B #30B568 #307DB5

monochromatic

#54161B #85232B #B5303B #D1515C #DE8289

Accessibility & contrast

On white

6.09

#B5303B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.45

#B5303B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B5303B

6.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B5303B	#FFFFFF	#000000	##FFFFFF
##B5303B	1.00	6.09	3.45	6.09
#FFFFFF	6.09	1.00	21.00	1.00
#000000	3.45	21.00	1.00	21.00
##FFFFFF	6.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#56503A

Deuteranopia (green-blind)

#776C37

Tritanopia (blue-blind)

#C70035

Achromatopsia (no color)

#626262

Design tokens & code

CSS

--color: #b5303b;
/* rgb */ color: rgb(181, 48, 59);
/* oklch */ color: oklch(51.7% 0.169 21.1);

Tailwind

colors: {
  custom: {
    50: '#d37371',
    500: '#b5303b',
    950: '#000000',
  },
}

SCSS

$custom: #b5303b;
$custom-light: #d37371;
$custom-dark: #000000;

JSON

{
  "hex": "#b5303b",
  "rgb": {
    "r": 181,
    "g": 48,
    "b": 59
  },
  "hsl": {
    "h": 355.038,
    "s": 58.079,
    "l": 44.902
  },
  "oklch": {
    "l": 0.51747,
    "c": 0.16891,
    "h": 21.1
  },
  "luminance": 0.12253
}

Semantic roles & 50–950 ramp

primary

#B5303B

secondary

#7AC7C0

accent

#E1D446

background

#FEF7F6

surface

#FCEDEC

border

#D5C8C7

text

#160907

muted

#847B7A

Preview Lab

Preview with #B5303B

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

Preview Lab → · Contrast checker → · Palette generator →