#183D8B#183D8B

#183D8B is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.4% C 0.137 H 262.7°. Best body text is #FFFFFF at 10.10:1 contrast (WCAG AA passes).

Color values

HEX	#183D8B
RGB	rgb(24, 61, 139)
HSL	hsl(221, 71%, 32%)
HSV	hsv(221, 83%, 55%)
CMYK	cmyk(82.7%, 56.1%, 0%, 45.5%)
CIE-LAB	lab(27.83, 17.66, -47.07)
CIE-LCH	lch(27.83, 50.28, 290.56°)
OKLab	oklab(38.41% -0.0175 -0.1358)
OKLCH	oklch(38.41% 0.137 262.7)
XYZ	xyz(6.7040, 5.3950, 25.1091)
Luminance	0.0540 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D8B #8B6618

analogous

#18778B #183D8B #2D188B

triadic

#183D8B #8B183D #3D8B18

tetradic

#183D8B #8B1877 #8B6618 #188B2D

square

#183D8B #8B1877 #8B6618 #188B2D

split-complementary

#183D8B #8B2D18 #778B18

monochromatic

#060F23 #0F2657 #183D8B #2154BF #3F72DE

Accessibility & contrast

On white

10.10

#183D8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#183D8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D8B

10.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D8B	#FFFFFF	#000000	##FFFFFF
##183D8B	1.00	10.10	2.08	10.10
#FFFFFF	10.10	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478E

Deuteranopia (green-blind)

#003D89

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #183d8b;
/* rgb */ color: rgb(24, 61, 139);
/* oklch */ color: oklch(38.4% 0.137 262.7);

Tailwind

colors: {
  custom: {
    50: '#6a71ae',
    500: '#183d8b',
    950: '#000000',
  },
}

SCSS

$custom: #183d8b;
$custom-light: #6a71ae;
$custom-dark: #000000;

JSON

{
  "hex": "#183d8b",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 139
  },
  "hsl": {
    "h": 220.696,
    "s": 70.552,
    "l": 31.961
  },
  "oklch": {
    "l": 0.38405,
    "c": 0.13696,
    "h": 262.7
  },
  "luminance": 0.05396
}

Semantic roles & 50–950 ramp

primary

#183D8B

secondary

#BE9640

accent

#B43AED

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #183D8B

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

Preview Lab → · Contrast checker → · Palette generator →