#183A8F#183A8F

#183A8F is a dark, vivid blue. Relative luminance 0.052; OKLCH L 38.1% C 0.146 H 264.1°. Best body text is #FFFFFF at 10.29:1 contrast (WCAG AA passes).

Color values

HEX	#183A8F
RGB	rgb(24, 58, 143)
HSL	hsl(223, 71%, 33%)
HSV	hsv(223, 83%, 56%)
CMYK	cmyk(83.2%, 59.4%, 0%, 43.9%)
CIE-LAB	lab(27.30, 21.38, -50.40)
CIE-LCH	lch(27.30, 54.75, 292.98°)
OKLab	oklab(38.11% -0.0151 -0.1457)
OKLCH	oklch(38.11% 0.146 264.1)
XYZ	xyz(6.8459, 5.2027, 26.6247)
Luminance	0.0520 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A8F #8F6D18

analogous

#18758F #183A8F #31188F

triadic

#183A8F #8F183A #3A8F18

tetradic

#183A8F #8F1875 #8F6D18 #188F31

square

#183A8F #8F1875 #8F6D18 #188F31

split-complementary

#183A8F #8F3118 #758F18

monochromatic

#060F26 #0F255B #183A8F #214FC3 #426FDF

Accessibility & contrast

On white

10.29

#183A8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.04

#183A8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A8F

10.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A8F	#FFFFFF	#000000	##FFFFFF
##183A8F	1.00	10.29	2.04	10.29
#FFFFFF	10.29	1.00	21.00	1.00
#000000	2.04	21.00	1.00	21.00
##FFFFFF	10.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004692

Deuteranopia (green-blind)

#003B8D

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #183a8f;
/* rgb */ color: rgb(24, 58, 143);
/* oklch */ color: oklch(38.1% 0.146 264.1);

Tailwind

colors: {
  custom: {
    50: '#6b6fb1',
    500: '#183a8f',
    950: '#000000',
  },
}

SCSS

$custom: #183a8f;
$custom-light: #6b6fb1;
$custom-dark: #000000;

JSON

{
  "hex": "#183a8f",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 143
  },
  "hsl": {
    "h": 222.857,
    "s": 71.257,
    "l": 32.745
  },
  "oklch": {
    "l": 0.3811,
    "c": 0.14645,
    "h": 264.1
  },
  "luminance": 0.05203
}

Semantic roles & 50–950 ramp

primary

#183A8F

secondary

#C09C43

accent

#BB3AEE

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#080711

muted

#7B7A80

Preview Lab

Preview with #183A8F

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

Preview Lab → · Contrast checker → · Palette generator →