#183A75#183A75

#183A75 is a dark, moderate blue. Relative luminance 0.045; OKLCH L 35.9% C 0.109 H 260.6°. Best body text is #FFFFFF at 11.05:1 contrast (WCAG AA passes).

Color values

HEX	#183A75
RGB	rgb(24, 58, 117)
HSL	hsl(218, 66%, 28%)
HSV	hsv(218, 79%, 46%)
CMYK	cmyk(79.5%, 50.4%, 0%, 54.1%)
CIE-LAB	lab(25.27, 10.68, -37.43)
CIE-LCH	lch(25.27, 38.92, 285.93°)
OKLab	oklab(35.93% -0.0178 -0.1075)
OKLCH	oklch(35.93% 0.109 260.6)
XYZ	xyz(5.0995, 4.5041, 17.4268)
Luminance	0.0450 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A75 #755318

analogous

#186875 #183A75 #251875

triadic

#183A75 #75183A #3A7518

tetradic

#183A75 #751868 #755318 #187525

square

#183A75 #751868 #755318 #187525

split-complementary

#183A75 #752518 #687518

monochromatic

#050D19 #0E2142 #183A75 #2253A8 #326ED5

Accessibility & contrast

On white

11.05

#183A75 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#183A75 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A75

11.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A75	#FFFFFF	#000000	##FFFFFF
##183A75	1.00	11.05	1.90	11.05
#FFFFFF	11.05	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#194077

Deuteranopia (green-blind)

#003874

Tritanopia (blue-blind)

#004852

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #183a75;
/* rgb */ color: rgb(24, 58, 117);
/* oklch */ color: oklch(35.9% 0.109 260.6);

Tailwind

colors: {
  custom: {
    50: '#646f9d',
    500: '#183a75',
    950: '#000000',
  },
}

SCSS

$custom: #183a75;
$custom-light: #646f9d;
$custom-dark: #000000;

JSON

{
  "hex": "#183a75",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 117
  },
  "hsl": {
    "h": 218.065,
    "s": 65.957,
    "l": 27.647
  },
  "oklch": {
    "l": 0.35927,
    "c": 0.10899,
    "h": 260.6
  },
  "luminance": 0.04505
}

Semantic roles & 50–950 ramp

primary

#183A75

secondary

#AA833F

accent

#AB3FE9

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183A75

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

Preview Lab → · Contrast checker → · Palette generator →