#B3581B#B3581B

#B3581B is a mid, vivid orange. Relative luminance 0.166; OKLCH L 56.2% C 0.137 H 49.3°. Best body text is #FFFFFF at 4.85:1 contrast (WCAG AA passes).

Color values

HEX	#B3581B
RGB	rgb(179, 88, 27)
HSL	hsl(24, 74%, 40%)
HSV	hsv(24, 85%, 70%)
CMYK	cmyk(0%, 50.8%, 84.9%, 29.8%)
CIE-LAB	lab(47.81, 33.25, 49.10)
CIE-LCH	lch(47.81, 59.30, 55.90°)
OKLab	oklab(56.25% 0.0894 0.104)
OKLCH	oklch(56.25% 0.137 49.3)
XYZ	xyz(22.2802, 16.6451, 3.0763)
Luminance	0.1664 (WCAG relative)
Temperature	warm
Family	orange

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#B3581B #1B76B3

analogous

#B31B2A #B3581B #B3A41B

triadic

#B3581B #1BB358 #581BB3

tetradic

#B3581B #2AB31B #1B76B3 #A41BB3

square

#B3581B #2AB31B #1B76B3 #A41BB3

split-complementary

#B3581B #1BB3A4 #1B2AB3

monochromatic

#49240B #7E3E13 #B3581B #DF742C #E79761

Accessibility & contrast

On white

4.85

#B3581B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.33

#B3581B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #B3581B

4.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##B3581B	#FFFFFF	#000000	##FFFFFF
##B3581B	1.00	4.85	4.33	4.85
#FFFFFF	4.85	1.00	21.00	1.00
#000000	4.33	21.00	1.00	21.00
##FFFFFF	4.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#726510

Deuteranopia (green-blind)

#887919

Tritanopia (blue-blind)

#C5444C

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #b3581b;
/* rgb */ color: rgb(179, 88, 27);
/* oklch */ color: oklch(56.2% 0.137 49.3);

Tailwind

colors: {
  custom: {
    50: '#d1895e',
    500: '#b3581b',
    950: '#000000',
  },
}

SCSS

$custom: #b3581b;
$custom-light: #d1895e;
$custom-dark: #000000;

JSON

{
  "hex": "#b3581b",
  "rgb": {
    "r": 179,
    "g": 88,
    "b": 27
  },
  "hsl": {
    "h": 24.079,
    "s": 73.786,
    "l": 40.392
  },
  "oklch": {
    "l": 0.56247,
    "c": 0.13712,
    "h": 49.3
  },
  "luminance": 0.16642
}

Semantic roles & 50–950 ramp

primary

#B3581B

secondary

#5EA0CC

accent

#A6F037

background

#FDF8F5

surface

#FBF0E9

border

#D4CBC5

text

#150B05

muted

#837C79

Preview Lab

Preview with #B3581B

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

Preview Lab → · Contrast checker → · Palette generator →