#03183B#03183B

#03183B is a very dark, moderate blue. Relative luminance 0.010; OKLCH L 21.7% C 0.073 H 259.1°. Best body text is #FFFFFF at 17.54:1 contrast (WCAG AA passes).

Color values

HEX	#03183B
RGB	rgb(3, 24, 59)
HSL	hsl(218, 90%, 12%)
HSV	hsv(218, 95%, 23%)
CMYK	cmyk(94.9%, 59.3%, 0%, 76.9%)
CIE-LAB	lab(8.89, 7.60, -25.01)
CIE-LCH	lch(8.89, 26.14, 286.90°)
OKLab	oklab(21.7% -0.0139 -0.0721)
OKLCH	oklch(21.7% 0.073 259.1)
XYZ	xyz(1.1533, 0.9882, 4.2668)
Luminance	0.0099 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#03183B #3B2603

analogous

#03343B #03183B #0A033B

triadic

#03183B #3B0318 #183B03

tetradic

#03183B #3B0334 #3B2603 #033B0A

square

#03183B #3B0334 #3B2603 #033B0A

split-complementary

#03183B #3B0A03 #343B03

monochromatic

#010C1D #010C1D #03183B #063075 #0947AF

Accessibility & contrast

On white

17.54

#03183B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.20

#03183B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #03183B

17.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##03183B	#FFFFFF	#000000	##FFFFFF
##03183B	1.00	17.54	1.20	17.54
#FFFFFF	17.54	1.00	21.00	1.00
#000000	1.20	21.00	1.00	21.00
##FFFFFF	17.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#031C3C

Deuteranopia (green-blind)

#00173A

Tritanopia (blue-blind)

#002126

Achromatopsia (no color)

#191919

Design tokens & code

CSS

--color: #03183b;
/* rgb */ color: rgb(3, 24, 59);
/* oklch */ color: oklch(21.7% 0.073 259.1);

Tailwind

colors: {
  custom: {
    50: '#4e5471',
    500: '#03183b',
    950: '#000000',
  },
}

SCSS

$custom: #03183b;
$custom-light: #4e5471;
$custom-dark: #000000;

JSON

{
  "hex": "#03183b",
  "rgb": {
    "r": 3,
    "g": 24,
    "b": 59
  },
  "hsl": {
    "h": 217.5,
    "s": 90.323,
    "l": 12.157
  },
  "oklch": {
    "l": 0.21704,
    "c": 0.07345,
    "h": 259.1
  },
  "luminance": 0.00988
}

Semantic roles & 50–950 ramp

primary

#03183B

secondary

#7E591C

accent

#AF29FF

background

#F4F4F6

surface

#E7E7EC

border

#C3C3C7

text

#020207

muted

#78787A

Preview Lab

Preview with #03183B

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

Preview Lab → · Contrast checker → · Palette generator →