#183A9F#183A9F

#183A9F is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.6% C 0.168 H 265.0°. Best body text is #FFFFFF at 9.79:1 contrast (WCAG AA passes).

Color values

HEX	#183A9F
RGB	rgb(24, 58, 159)
HSL	hsl(225, 74%, 36%)
HSV	hsv(225, 85%, 62%)
CMYK	cmyk(84.9%, 63.5%, 0%, 37.6%)
CIE-LAB	lab(28.70, 27.77, -57.91)
CIE-LCH	lch(28.70, 64.22, 295.62°)
OKLab	oklab(39.59% -0.0147 -0.1677)
OKLCH	oklch(39.59% 0.168 265)
XYZ	xyz(8.1455, 5.7225, 33.4694)
Luminance	0.0572 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A9F #9F7D18

analogous

#187D9F #183A9F #39189F

triadic

#183A9F #9F183A #3A9F18

tetradic

#183A9F #9F187D #9F7D18 #189F39

square

#183A9F #9F187D #9F7D18 #189F39

split-complementary

#183A9F #9F3918 #7D9F18

monochromatic

#081335 #10276A #183A9F #204DD4 #4D73E4

Accessibility & contrast

On white

9.79

#183A9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#183A9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A9F

9.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A9F	#FFFFFF	#000000	##FFFFFF
##183A9F	1.00	9.79	2.14	9.79
#FFFFFF	9.79	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004AA2

Deuteranopia (green-blind)

#003E9D

Tritanopia (blue-blind)

#005567

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #183a9f;
/* rgb */ color: rgb(24, 58, 159);
/* oklch */ color: oklch(39.6% 0.168 265.0);

Tailwind

colors: {
  custom: {
    50: '#6f6fbc',
    500: '#183a9f',
    950: '#000000',
  },
}

SCSS

$custom: #183a9f;
$custom-light: #6f6fbc;
$custom-dark: #000000;

JSON

{
  "hex": "#183a9f",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 159
  },
  "hsl": {
    "h": 224.889,
    "s": 73.77,
    "l": 35.882
  },
  "oklch": {
    "l": 0.39585,
    "c": 0.16832,
    "h": 265
  },
  "luminance": 0.05724
}

Semantic roles & 50–950 ramp

primary

#183A9F

secondary

#C6A84D

accent

#C237F0

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #183A9F

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

Preview Lab → · Contrast checker → · Palette generator →