#183F5A#183F5A

#183F5A is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.3% C 0.064 H 242.0°. Best body text is #FFFFFF at 11.07:1 contrast (WCAG AA passes).

Color values

HEX	#183F5A
RGB	rgb(24, 63, 90)
HSL	hsl(205, 58%, 22%)
HSV	hsv(205, 73%, 35%)
CMYK	cmyk(73.3%, 30%, 0%, 64.7%)
CIE-LAB	lab(25.22, -3.77, -20.14)
CIE-LCH	lch(25.22, 20.49, 259.40°)
OKLab	oklab(35.34% -0.0302 -0.0568)
OKLCH	oklch(35.34% 0.064 242)
XYZ	xyz(3.9990, 4.4870, 10.3262)
Luminance	0.0449 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F5A #5A3318

analogous

#185A54 #183F5A #181E5A

triadic

#183F5A #5A183F #3F5A18

tetradic

#183F5A #54185A #5A3318 #1E5A18

square

#183F5A #54185A #5A3318 #1E5A18

split-complementary

#183F5A #5A181E #5A5418

monochromatic

#061118 #0B1D2A #183F5A #25618A #3283BB

Accessibility & contrast

On white

11.07

#183F5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.90

#183F5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F5A

11.07:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F5A	#FFFFFF	#000000	##FFFFFF
##183F5A	1.00	11.07	1.90	11.07
#FFFFFF	11.07	1.00	21.00	1.00
#000000	1.90	21.00	1.00	21.00
##FFFFFF	11.07	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#333F5B

Deuteranopia (green-blind)

#2A395A

Tritanopia (blue-blind)

#004648

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #183f5a;
/* rgb */ color: rgb(24, 63, 90);
/* oklch */ color: oklch(35.3% 0.064 242.0);

Tailwind

colors: {
  custom: {
    50: '#5e7388',
    500: '#183f5a',
    950: '#000000',
  },
}

SCSS

$custom: #183f5a;
$custom-light: #5e7388;
$custom-dark: #000000;

JSON

{
  "hex": "#183f5a",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 90
  },
  "hsl": {
    "h": 204.545,
    "s": 57.895,
    "l": 22.353
  },
  "oklch": {
    "l": 0.35343,
    "c": 0.0643,
    "h": 242
  },
  "luminance": 0.04487
}

Semantic roles & 50–950 ramp

primary

#183F5A

secondary

#915F3D

accent

#8647E1

background

#F5F7F8

surface

#E9EDF0

border

#C5C8CB

text

#05080B

muted

#797B7C

Preview Lab

Preview with #183F5A

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

Preview Lab → · Contrast checker → · Palette generator →