#183A7B#183A7B

#183A7B is a dark, moderate blue. Relative luminance 0.046; OKLCH L 36.4% C 0.118 H 261.7°. Best body text is #FFFFFF at 10.88:1 contrast (WCAG AA passes).

Color values

HEX	#183A7B
RGB	rgb(24, 58, 123)
HSL	hsl(219, 67%, 29%)
HSV	hsv(219, 80%, 48%)
CMYK	cmyk(80.5%, 52.8%, 0%, 51.8%)
CIE-LAB	lab(25.71, 13.17, -40.52)
CIE-LCH	lch(25.71, 42.60, 288.01°)
OKLab	oklab(36.4% -0.0169 -0.1166)
OKLCH	oklch(36.4% 0.118 261.7)
XYZ	xyz(5.4636, 4.6497, 19.3446)
Luminance	0.0465 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A7B #7B5918

analogous

#186C7B #183A7B #28187B

triadic

#183A7B #7B183A #3A7B18

tetradic

#183A7B #7B186C #7B5918 #187B28

square

#183A7B #7B186C #7B5918 #187B28

split-complementary

#183A7B #7B2818 #6C7B18

monochromatic

#050C1A #0E2248 #183A7B #2252AE #366DD8

Accessibility & contrast

On white

10.88

#183A7B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#183A7B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A7B

10.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A7B	#FFFFFF	#000000	##FFFFFF
##183A7B	1.00	10.88	1.93	10.88
#FFFFFF	10.88	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#10427D

Deuteranopia (green-blind)

#00397A

Tritanopia (blue-blind)

#004A54

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #183a7b;
/* rgb */ color: rgb(24, 58, 123);
/* oklch */ color: oklch(36.4% 0.118 261.7);

Tailwind

colors: {
  custom: {
    50: '#666fa2',
    500: '#183a7b',
    950: '#000000',
  },
}

SCSS

$custom: #183a7b;
$custom-light: #666fa2;
$custom-dark: #000000;

JSON

{
  "hex": "#183a7b",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 123
  },
  "hsl": {
    "h": 219.394,
    "s": 67.347,
    "l": 28.824
  },
  "oklch": {
    "l": 0.36404,
    "c": 0.11782,
    "h": 261.7
  },
  "luminance": 0.0465
}

Semantic roles & 50–950 ramp

primary

#183A7B

secondary

#B0893F

accent

#AF3EEA

background

#F6F6FA

surface

#EBECF3

border

#C6C7CD

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #183A7B

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

Preview Lab → · Contrast checker → · Palette generator →