#183A5B#183A5B

#183A5B is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.1% C 0.070 H 250.1°. Best body text is #FFFFFF at 11.70:1 contrast (WCAG AA passes).

Color values

HEX	#183A5B
RGB	rgb(24, 58, 91)
HSL	hsl(210, 58%, 23%)
HSV	hsv(210, 74%, 36%)
CMYK	cmyk(73.6%, 36.3%, 0%, 64.3%)
CIE-LAB	lab(23.59, -0.01, -23.35)
CIE-LCH	lch(23.59, 23.35, 269.97°)
OKLab	oklab(34.08% -0.024 -0.0662)
OKLCH	oklch(34.08% 0.07 250.1)
XYZ	xyz(3.7774, 3.9752, 10.4637)
Luminance	0.0398 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183A5B #5B3918

analogous

#185B5A #183A5B #18195B

triadic

#183A5B #5B183A #3A5B18

tetradic

#183A5B #5A185B #5B3918 #195B18

square

#183A5B #5A185B #5B3918 #195B18

split-complementary

#183A5B #5B1819 #5B5A18

monochromatic

#060F18 #0B1B2B #183A5B #25598B #3278BC

Accessibility & contrast

On white

11.70

#183A5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.80

#183A5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183A5B

11.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183A5B	#FFFFFF	#000000	##FFFFFF
##183A5B	1.00	11.70	1.80	11.70
#FFFFFF	11.70	1.00	21.00	1.00
#000000	1.80	21.00	1.00	21.00
##FFFFFF	11.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2B3C5C

Deuteranopia (green-blind)

#22355A

Tritanopia (blue-blind)

#004246

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #183a5b;
/* rgb */ color: rgb(24, 58, 91);
/* oklch */ color: oklch(34.1% 0.070 250.1);

Tailwind

colors: {
  custom: {
    50: '#5e6f89',
    500: '#183a5b',
    950: '#000000',
  },
}

SCSS

$custom: #183a5b;
$custom-light: #5e6f89;
$custom-dark: #000000;

JSON

{
  "hex": "#183a5b",
  "rgb": {
    "r": 24,
    "g": 58,
    "b": 91
  },
  "hsl": {
    "h": 209.552,
    "s": 58.261,
    "l": 22.549
  },
  "oklch": {
    "l": 0.34076,
    "c": 0.07044,
    "h": 250.1
  },
  "luminance": 0.03976
}

Semantic roles & 50–950 ramp

primary

#183A5B

secondary

#92673D

accent

#9346E1

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183A5B

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

Preview Lab → · Contrast checker → · Palette generator →