#183D8A#183D8A

#183D8A is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.3% C 0.136 H 262.6°. Best body text is #FFFFFF at 10.13:1 contrast (WCAG AA passes).

Color values

HEX	#183D8A
RGB	rgb(24, 61, 138)
HSL	hsl(221, 70%, 32%)
HSV	hsv(221, 83%, 54%)
CMYK	cmyk(82.6%, 55.8%, 0%, 45.9%)
CIE-LAB	lab(27.75, 17.25, -46.58)
CIE-LCH	lch(27.75, 49.67, 290.32°)
OKLab	oklab(38.32% -0.0176 -0.1344)
OKLCH	oklch(38.32% 0.136 262.6)
XYZ	xyz(6.6312, 5.3659, 24.7260)
Luminance	0.0537 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D8A #8A6518

analogous

#18768A #183D8A #2C188A

triadic

#183D8A #8A183D #3D8A18

tetradic

#183D8A #8A1876 #8A6518 #188A2C

square

#183D8A #8A1876 #8A6518 #188A2C

split-complementary

#183D8A #8A2C18 #768A18

monochromatic

#060F22 #0F2656 #183D8A #2154BE #3F72DE

Accessibility & contrast

On white

10.13

#183D8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.07

#183D8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D8A

10.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D8A	#FFFFFF	#000000	##FFFFFF
##183D8A	1.00	10.13	2.07	10.13
#FFFFFF	10.13	1.00	21.00	1.00
#000000	2.07	21.00	1.00	21.00
##FFFFFF	10.13	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478D

Deuteranopia (green-blind)

#003D88

Tritanopia (blue-blind)

#00505D

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #183d8a;
/* rgb */ color: rgb(24, 61, 138);
/* oklch */ color: oklch(38.3% 0.136 262.6);

Tailwind

colors: {
  custom: {
    50: '#6971ad',
    500: '#183d8a',
    950: '#000000',
  },
}

SCSS

$custom: #183d8a;
$custom-light: #6971ad;
$custom-dark: #000000;

JSON

{
  "hex": "#183d8a",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 138
  },
  "hsl": {
    "h": 220.526,
    "s": 70.37,
    "l": 31.765
  },
  "oklch": {
    "l": 0.3832,
    "c": 0.13553,
    "h": 262.6
  },
  "luminance": 0.05367
}

Semantic roles & 50–950 ramp

primary

#183D8A

secondary

#BD9540

accent

#B33BED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #183D8A

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

Preview Lab → · Contrast checker → · Palette generator →