#183D71#183D71

#183D71 is a dark, moderate blue. Relative luminance 0.047; OKLCH L 36.3% C 0.099 H 257.6°. Best body text is #FFFFFF at 10.80:1 contrast (WCAG AA passes).

Color values

HEX	#183D71
RGB	rgb(24, 61, 113)
HSL	hsl(215, 65%, 27%)
HSV	hsv(215, 79%, 44%)
CMYK	cmyk(78.8%, 46%, 0%, 55.7%)
CIE-LAB	lab(25.93, 6.92, -33.83)
CIE-LCH	lch(25.93, 34.53, 281.56°)
OKLab	oklab(36.35% -0.0214 -0.0969)
OKLCH	oklch(36.35% 0.099 257.6)
XYZ	xyz(5.0250, 4.7234, 16.2665)
Luminance	0.0472 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D71 #714C18

analogous

#186A71 #183D71 #1F1871

triadic

#183D71 #71183D #3D7118

tetradic

#183D71 #71186A #714C18 #18711F

square

#183D71 #71186A #714C18 #18711F

split-complementary

#183D71 #711F18 #6A7118

monochromatic

#050E19 #0D223F #183D71 #2358A3 #3074D3

Accessibility & contrast

On white

10.80

#183D71 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.94

#183D71 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D71

10.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D71	#FFFFFF	#000000	##FFFFFF
##183D71	1.00	10.80	1.94	10.80
#FFFFFF	10.80	1.00	21.00	1.00
#000000	1.94	21.00	1.00	21.00
##FFFFFF	10.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#234273

Deuteranopia (green-blind)

#123A70

Tritanopia (blue-blind)

#004951

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #183d71;
/* rgb */ color: rgb(24, 61, 113);
/* oklch */ color: oklch(36.3% 0.099 257.6);

Tailwind

colors: {
  custom: {
    50: '#63729a',
    500: '#183d71',
    950: '#000000',
  },
}

SCSS

$custom: #183d71;
$custom-light: #63729a;
$custom-dark: #000000;

JSON

{
  "hex": "#183d71",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 113
  },
  "hsl": {
    "h": 215.056,
    "s": 64.964,
    "l": 26.863
  },
  "oklch": {
    "l": 0.36345,
    "c": 0.09919,
    "h": 257.6
  },
  "luminance": 0.04724
}

Semantic roles & 50–950 ramp

primary

#183D71

secondary

#A67B3E

accent

#A240E8

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06070E

muted

#7A7A7E

Preview Lab

Preview with #183D71

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

Preview Lab → · Contrast checker → · Palette generator →