#3F181B#3F181B

#3F181B is a dark, moderate red. Relative luminance 0.018; OKLCH L 26.9% C 0.061 H 17.4°. Best body text is #FFFFFF at 15.47:1 contrast (WCAG AA passes).

Color values

HEX	#3F181B
RGB	rgb(63, 24, 27)
HSL	hsl(355, 45%, 17%)
HSV	hsv(355, 62%, 25%)
CMYK	cmyk(0%, 61.9%, 57.1%, 75.3%)
CIE-LAB	lab(14.34, 19.38, 7.24)
CIE-LCH	lch(14.34, 20.69, 20.48°)
OKLab	oklab(26.9% 0.0583 0.0183)
OKLCH	oklch(26.9% 0.061 17.4)
XYZ	xyz(2.5746, 1.7895, 1.2465)
Luminance	0.0179 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F181B #183F3C

analogous

#3F182F #3F181B #3F2918

triadic

#3F181B #1B3F18 #181B3F

tetradic

#3F181B #2F3F18 #183F3C #29183F

square

#3F181B #2F3F18 #183F3C #29183F

split-complementary

#3F181B #183F29 #182F3F

monochromatic

#160809 #160809 #3F181B #6B292E #983A41

Accessibility & contrast

On white

15.47

#3F181B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.36

#3F181B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F181B

15.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F181B	#FFFFFF	#000000	##FFFFFF
##3F181B	1.00	15.47	1.36	15.47
#FFFFFF	15.47	1.00	21.00	1.00
#000000	1.36	21.00	1.00	21.00
##FFFFFF	15.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#211F1B

Deuteranopia (green-blind)

#2A271A

Tritanopia (blue-blind)

#451219

Achromatopsia (no color)

#242424

Design tokens & code

CSS

--color: #3f181b;
/* rgb */ color: rgb(63, 24, 27);
/* oklch */ color: oklch(26.9% 0.061 17.4);

Tailwind

colors: {
  custom: {
    50: '#775657',
    500: '#3f181b',
    950: '#000000',
  },
}

SCSS

$custom: #3f181b;
$custom-light: #775657;
$custom-dark: #000000;

JSON

{
  "hex": "#3f181b",
  "rgb": {
    "r": 63,
    "g": 24,
    "b": 27
  },
  "hsl": {
    "h": 355.385,
    "s": 44.828,
    "l": 17.059
  },
  "oklch": {
    "l": 0.26904,
    "c": 0.06105,
    "h": 17.4
  },
  "luminance": 0.01789
}

Semantic roles & 50–950 ramp

primary

#3F181B

secondary

#3D7571

accent

#D5CB53

background

#F7F5F5

surface

#EDE9E9

border

#C8C5C5

text

#090303

muted

#7B7878

Preview Lab

Preview with #3F181B

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

Preview Lab → · Contrast checker → · Palette generator →