#042537#042537

#042537 is a dark, muted cyan. Relative luminance 0.016; OKLCH L 25.1% C 0.050 H 237.4°. Best body text is #FFFFFF at 15.85:1 contrast (WCAG AA passes).

Color values

HEX	#042537
RGB	rgb(4, 37, 55)
HSL	hsl(201, 86%, 12%)
HSV	hsv(201, 93%, 22%)
CMYK	cmyk(92.7%, 32.7%, 0%, 78.4%)
CIE-LAB	lab(13.38, -4.04, -15.01)
CIE-LCH	lch(13.38, 15.54, 254.93°)
OKLab	oklab(25.13% -0.0272 -0.0425)
OKLCH	oklch(25.13% 0.05 237.4)
XYZ	xyz(1.4010, 1.6246, 3.8534)
Luminance	0.0163 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#042537 #371604

analogous

#043730 #042537 #040C37

triadic

#042537 #370425 #253704

tetradic

#042537 #300437 #371604 #0C3704

square

#042537 #300437 #371604 #0C3704

split-complementary

#042537 #37040C #373004

monochromatic

#02131D #02131D #042537 #084B70 #0C72A9

Accessibility & contrast

On white

15.85

#042537 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.33

#042537 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #042537

15.85:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##042537	#FFFFFF	#000000	##FFFFFF
##042537	1.00	15.85	1.33	15.85
#FFFFFF	15.85	1.00	21.00	1.00
#000000	1.33	21.00	1.00	21.00
##FFFFFF	15.85	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1C2538

Deuteranopia (green-blind)

#152037

Tritanopia (blue-blind)

#002A2B

Achromatopsia (no color)

#222222

Design tokens & code

CSS

--color: #042537;
/* rgb */ color: rgb(4, 37, 55);
/* oklch */ color: oklch(25.1% 0.050 237.4);

Tailwind

colors: {
  custom: {
    50: '#4e5f6e',
    500: '#042537',
    950: '#000000',
  },
}

SCSS

$custom: #042537;
$custom-light: #4e5f6e;
$custom-dark: #000000;

JSON

{
  "hex": "#042537",
  "rgb": {
    "r": 4,
    "g": 37,
    "b": 55
  },
  "hsl": {
    "h": 201.176,
    "s": 86.441,
    "l": 11.569
  },
  "oklch": {
    "l": 0.25131,
    "c": 0.05041,
    "h": 237.4
  },
  "luminance": 0.01625
}

Semantic roles & 50–950 ramp

primary

#042537

secondary

#793E1E

accent

#752BFD

background

#F4F5F6

surface

#E7E9EB

border

#C3C5C6

text

#020407

muted

#78797A

Preview Lab

Preview with #042537

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

Preview Lab → · Contrast checker → · Palette generator →