#042F3B#042F3B

#042F3B is a dark, muted cyan. Relative luminance 0.024; OKLCH L 28.4% C 0.049 H 221.6°. Best body text is #FFFFFF at 14.24:1 contrast (WCAG AA passes).

Color values

HEX	#042F3B
RGB	rgb(4, 47, 59)
HSL	hsl(193, 87%, 12%)
HSV	hsv(193, 93%, 23%)
CMYK	cmyk(93.2%, 20.3%, 0%, 76.9%)
CIE-LAB	lab(17.34, -9.07, -11.65)
CIE-LCH	lch(17.34, 14.77, 232.08°)
OKLab	oklab(28.37% -0.0368 -0.0327)
OKLCH	oklch(28.37% 0.049 221.6)
XYZ	xyz(1.8557, 2.3744, 4.4973)
Luminance	0.0238 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#042F3B #3B1004

analogous

#043B2C #042F3B #04133B

triadic

#042F3B #3B042F #2F3B04

tetradic

#042F3B #2C043B #3B1004 #133B04

square

#042F3B #2C043B #3B1004 #133B04

split-complementary

#042F3B #3B0413 #3B2C04

monochromatic

#02171D #02171D #042F3B #085D74 #0C8AAE

Accessibility & contrast

On white

14.24

#042F3B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.48

#042F3B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #042F3B

14.24:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##042F3B	#FFFFFF	#000000	##FFFFFF
##042F3B	1.00	14.24	1.48	14.24
#FFFFFF	14.24	1.00	21.00	1.00
#000000	1.48	21.00	1.00	21.00
##FFFFFF	14.24	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#282E3C

Deuteranopia (green-blind)

#21283B

Tritanopia (blue-blind)

#003333

Achromatopsia (no color)

#2B2B2B

Design tokens & code

CSS

--color: #042f3b;
/* rgb */ color: rgb(4, 47, 59);
/* oklch */ color: oklch(28.4% 0.049 221.6);

Tailwind

colors: {
  custom: {
    50: '#4f6771',
    500: '#042f3b',
    950: '#000000',
  },
}

SCSS

$custom: #042f3b;
$custom-light: #4f6771;
$custom-dark: #000000;

JSON

{
  "hex": "#042f3b",
  "rgb": {
    "r": 4,
    "g": 47,
    "b": 59
  },
  "hsl": {
    "h": 193.091,
    "s": 87.302,
    "l": 12.353
  },
  "oklch": {
    "l": 0.28369,
    "c": 0.04921,
    "h": 221.6
  },
  "luminance": 0.02375
}

Semantic roles & 50–950 ramp

primary

#042F3B

secondary

#7D331E

accent

#582AFD

background

#F4F6F6

surface

#E7EBEC

border

#C3C6C7

text

#020607

muted

#787A7A

Preview Lab

Preview with #042F3B

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

Preview Lab → · Contrast checker → · Palette generator →