#183F88#183F88

#183F88 is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.6% C 0.130 H 261.5°. Best body text is #FFFFFF at 9.97:1 contrast (WCAG AA passes).

Color values

HEX	#183F88
RGB	rgb(24, 63, 136)
HSL	hsl(219, 70%, 31%)
HSV	hsv(219, 82%, 53%)
CMYK	cmyk(82.4%, 53.7%, 0%, 46.7%)
CIE-LAB	lab(28.18, 15.03, -44.65)
CIE-LCH	lch(28.18, 47.11, 288.61°)
OKLab	oklab(38.6% -0.0193 -0.1286)
OKLCH	oklch(38.6% 0.13 261.5)
XYZ	xyz(6.5965, 5.5260, 24.0067)
Luminance	0.0553 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F88 #886118

analogous

#187788 #183F88 #291888

triadic

#183F88 #88183F #3F8818

tetradic

#183F88 #881877 #886118 #188829

square

#183F88 #881877 #886118 #188829

split-complementary

#183F88 #882918 #778818

monochromatic

#060F20 #0F2754 #183F88 #2157BC #3E75DD

Accessibility & contrast

On white

9.97

#183F88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.11

#183F88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F88

9.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F88	#FFFFFF	#000000	##FFFFFF
##183F88	1.00	9.97	2.11	9.97
#FFFFFF	9.97	1.00	21.00	1.00
#000000	2.11	21.00	1.00	21.00
##FFFFFF	9.97	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0B488B

Deuteranopia (green-blind)

#003E87

Tritanopia (blue-blind)

#00515D

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #183f88;
/* rgb */ color: rgb(24, 63, 136);
/* oklch */ color: oklch(38.6% 0.130 261.5);

Tailwind

colors: {
  custom: {
    50: '#6973ab',
    500: '#183f88',
    950: '#000000',
  },
}

SCSS

$custom: #183f88;
$custom-light: #6973ab;
$custom-dark: #000000;

JSON

{
  "hex": "#183f88",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 136
  },
  "hsl": {
    "h": 219.107,
    "s": 70,
    "l": 31.373
  },
  "oklch": {
    "l": 0.38599,
    "c": 0.13009,
    "h": 261.5
  },
  "luminance": 0.05527
}

Semantic roles & 50–950 ramp

primary

#183F88

secondary

#BC9140

accent

#AF3BED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #183F88

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

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