#3F040B#3F040B

#3F040B is a very dark, moderate red. Relative luminance 0.012; OKLCH L 23.8% C 0.088 H 20.9°. Best body text is #FFFFFF at 17.02:1 contrast (WCAG AA passes).

Color values

HEX	#3F040B
RGB	rgb(63, 4, 11)
HSL	hsl(353, 88%, 13%)
HSV	hsv(353, 94%, 25%)
CMYK	cmyk(0%, 93.7%, 82.5%, 75.3%)
CIE-LAB	lab(10.32, 28.05, 11.66)
CIE-LCH	lch(10.32, 30.37, 22.58°)
OKLab	oklab(23.78% 0.0823 0.0315)
OKLCH	oklch(23.78% 0.088 20.9)
XYZ	xyz(2.1540, 1.1681, 0.4286)
Luminance	0.0117 (WCAG relative)
Temperature	warm
Family	red

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3F040B #043F38

analogous

#3F0428 #3F040B #3F1A04

triadic

#3F040B #0B3F04 #040B3F

tetradic

#3F040B #283F04 #043F38 #1A043F

square

#3F040B #283F04 #043F38 #1A043F

split-complementary

#3F040B #043F1A #04283F

monochromatic

#1D0205 #1D0205 #3F040B #790815 #B20B1F

Accessibility & contrast

On white

17.02

#3F040B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.23

#3F040B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #3F040B

17.02:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3F040B	#FFFFFF	#000000	##FFFFFF
##3F040B	1.00	17.02	1.23	17.02
#FFFFFF	17.02	1.00	21.00	1.00
#000000	1.23	21.00	1.00	21.00
##FFFFFF	17.02	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#16140B

Deuteranopia (green-blind)

#252109

Tritanopia (blue-blind)

#460007

Achromatopsia (no color)

#1C1C1C

Design tokens & code

CSS

--color: #3f040b;
/* rgb */ color: rgb(63, 4, 11);
/* oklch */ color: oklch(23.8% 0.088 20.9);

Tailwind

colors: {
  custom: {
    50: '#794b4b',
    500: '#3f040b',
    950: '#000000',
  },
}

SCSS

$custom: #3f040b;
$custom-light: #794b4b;
$custom-dark: #000000;

JSON

{
  "hex": "#3f040b",
  "rgb": {
    "r": 63,
    "g": 4,
    "b": 11
  },
  "hsl": {
    "h": 352.881,
    "s": 88.06,
    "l": 13.137
  },
  "oklch": {
    "l": 0.23784,
    "c": 0.08813,
    "h": 20.9
  },
  "luminance": 0.01168
}

Semantic roles & 50–950 ramp

primary

#3F040B

secondary

#1E8075

accent

#FEE52A

background

#F7F4F4

surface

#EEE7E7

border

#C9C3C3

text

#0A0101

muted

#7C7777

Preview Lab

Preview with #3F040B

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

Preview Lab → · Contrast checker → · Palette generator →