#183A71#183A71

#183A71 is a dark, moderate blue. Relative luminance 0.044; OKLCH L 35.6% C 0.103 H 259.6°. Best body text is #FFFFFF at 11.15:1 contrast (WCAG AA passes).

Color values

HEX	#183A71
RGB	rgb(24, 58, 113)
HSL	hsl(217, 65%, 27%)
HSV	hsv(217, 79%, 44%)
CMYK	cmyk(78.8%, 48.7%, 0%, 55.7%)
CIE-LAB	lab(24.99, 9.02, -35.34)
CIE-LCH	lch(24.99, 36.47, 284.32°)
OKLab	oklab(35.62% -0.0185 -0.1014)
OKLCH	oklch(35.62% 0.103 259.6)
XYZ	xyz(4.8693, 4.4120, 16.2146)
Luminance	0.0441 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A71 #714F18

analogous

#186771 #183A71 #231871

triadic

#183A71 #71183A #3A7118

tetradic

#183A71 #711867 #714F18 #187123

square

#183A71 #711867 #714F18 #187123

split-complementary

#183A71 #712318 #677118

monochromatic

#050D19 #0D203F #183A71 #2354A3 #306ED3

Accessibility & contrast

On white

11.15

#183A71 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#183A71 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A71

11.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A71	#FFFFFF	#000000	##FFFFFF
##183A71	1.00	11.15	1.88	11.15
#FFFFFF	11.15	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1D4073

Deuteranopia (green-blind)

#073770

Tritanopia (blue-blind)

#004750

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183a71;
/* rgb */ color: rgb(24, 58, 113);
/* oklch */ color: oklch(35.6% 0.103 259.6);

Tailwind

colors: {
  custom: {
    50: '#636f9a',
    500: '#183a71',
    950: '#000000',
  },
}

SCSS

$custom: #183a71;
$custom-light: #636f9a;
$custom-dark: #000000;

JSON

{
  "hex": "#183a71",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 113
  },
  "hsl": {
    "h": 217.079,
    "s": 64.964,
    "l": 26.863
  },
  "oklch": {
    "l": 0.35618,
    "c": 0.10305,
    "h": 259.6
  },
  "luminance": 0.04413
}

Semantic roles & 50–950 ramp

primary

#183A71

secondary

#A67F3E

accent

#A840E8

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183A71

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

Preview Lab → · Contrast checker → · Palette generator →