#183A5E#183A5E

#183A5E is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.3% C 0.075 H 252.0°. Best body text is #FFFFFF at 11.63:1 contrast (WCAG AA passes).

Color values

HEX	#183A5E
RGB	rgb(24, 58, 94)
HSL	hsl(211, 59%, 23%)
HSV	hsv(211, 74%, 37%)
CMYK	cmyk(74.5%, 38.3%, 0%, 63.1%)
CIE-LAB	lab(23.76, 1.20, -25.04)
CIE-LCH	lch(23.76, 25.07, 272.74°)
OKLab	oklab(34.27% -0.0231 -0.0711)
OKLCH	oklch(34.27% 0.075 252)
XYZ	xyz(3.9094, 4.0280, 11.1590)
Luminance	0.0403 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A5E #5E3C18

analogous

#185D5E #183A5E #19185E

triadic

#183A5E #5E183A #3A5E18

tetradic

#183A5E #5E185D #5E3C18 #185E19

square

#183A5E #5E185D #5E3C18 #185E19

split-complementary

#183A5E #5E1918 #5D5E18

monochromatic

#060F18 #0C1C2D #183A5E #24588F #3176C0

Accessibility & contrast

On white

11.63

#183A5E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#183A5E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A5E

11.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A5E	#FFFFFF	#000000	##FFFFFF
##183A5E	1.00	11.63	1.81	11.63
#FFFFFF	11.63	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2A3C5F

Deuteranopia (green-blind)

#20365D

Tritanopia (blue-blind)

#004247

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #183a5e;
/* rgb */ color: rgb(24, 58, 94);
/* oklch */ color: oklch(34.3% 0.075 252.0);

Tailwind

colors: {
  custom: {
    50: '#5f6f8c',
    500: '#183a5e',
    950: '#000000',
  },
}

SCSS

$custom: #183a5e;
$custom-light: #5f6f8c;
$custom-dark: #000000;

JSON

{
  "hex": "#183a5e",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 94
  },
  "hsl": {
    "h": 210.857,
    "s": 59.322,
    "l": 23.137
  },
  "oklch": {
    "l": 0.3427,
    "c": 0.07479,
    "h": 252
  },
  "luminance": 0.04028
}

Semantic roles & 50–950 ramp

primary

#183A5E

secondary

#946A3D

accent

#9645E3

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070C

muted

#797A7D

Preview Lab

Preview with #183A5E

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

Preview Lab → · Contrast checker → · Palette generator →