#183F90#183F90

#183F90 is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.3% C 0.141 H 262.5°. Best body text is #FFFFFF at 9.76:1 contrast (WCAG AA passes).

Color values

HEX	#183F90
RGB	rgb(24, 63, 144)
HSL	hsl(221, 71%, 33%)
HSV	hsv(221, 83%, 56%)
CMYK	cmyk(83.3%, 56.3%, 0%, 43.5%)
CIE-LAB	lab(28.80, 18.31, -48.58)
CIE-LCH	lch(28.80, 51.91, 290.65°)
OKLab	oklab(39.27% -0.0184 -0.1402)
OKLCH	oklch(39.27% 0.141 262.5)
XYZ	xyz(7.1864, 5.7620, 27.1136)
Luminance	0.0576 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F90 #906918

analogous

#187B90 #183F90 #2D1890

triadic

#183F90 #90183F #3F9018

tetradic

#183F90 #90187B #906918 #18902D

square

#183F90 #90187B #906918 #18902D

split-complementary

#183F90 #902D18 #7B9018

monochromatic

#071127 #0F285C #183F90 #2156C4 #4376E0

Accessibility & contrast

On white

9.76

#183F90 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.15

#183F90 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F90

9.76:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F90	#FFFFFF	#000000	##FFFFFF
##183F90	1.00	9.76	2.15	9.76
#FFFFFF	9.76	1.00	21.00	1.00
#000000	2.15	21.00	1.00	21.00
##FFFFFF	9.76	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004A93

Deuteranopia (green-blind)

#003F8E

Tritanopia (blue-blind)

#005361

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #183f90;
/* rgb */ color: rgb(24, 63, 144);
/* oklch */ color: oklch(39.3% 0.141 262.5);

Tailwind

colors: {
  custom: {
    50: '#6b73b1',
    500: '#183f90',
    950: '#000000',
  },
}

SCSS

$custom: #183f90;
$custom-light: #6b73b1;
$custom-dark: #000000;

JSON

{
  "hex": "#183f90",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 144
  },
  "hsl": {
    "h": 220.5,
    "s": 71.429,
    "l": 32.941
  },
  "oklch": {
    "l": 0.39266,
    "c": 0.14143,
    "h": 262.5
  },
  "luminance": 0.05763
}

Semantic roles & 50–950 ramp

primary

#183F90

secondary

#C09843

accent

#B33AEE

background

#F6F6FB

surface

#ECECF6

border

#C7C7D0

text

#080811

muted

#7A7B80

Preview Lab

Preview with #183F90

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

Preview Lab → · Contrast checker → · Palette generator →