#18537B#18537B

#18537B is a dark, moderate cyan. Relative luminance 0.078; OKLCH L 42.5% C 0.089 H 243.1°. Best body text is #FFFFFF at 8.20:1 contrast (WCAG AA passes).

Color values

HEX	#18537B
RGB	rgb(24, 83, 123)
HSL	hsl(204, 67%, 29%)
HSV	hsv(204, 80%, 48%)
CMYK	cmyk(80.5%, 32.5%, 0%, 51.8%)
CIE-LAB	lab(33.58, -3.70, -27.96)
CIE-LCH	lch(33.58, 28.20, 262.45°)
OKLab	oklab(42.53% -0.0402 -0.0793)
OKLCH	oklch(42.53% 0.089 243.1)
XYZ	xyz(7.0437, 7.8099, 19.8713)
Luminance	0.0781 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#18537B #7B4018

analogous

#187B72 #18537B #18227B

triadic

#18537B #7B1853 #537B18

tetradic

#18537B #72187B #7B4018 #227B18

square

#18537B #72187B #7B4018 #227B18

split-complementary

#18537B #7B1822 #7B7218

monochromatic

#05111A #0E3048 #18537B #2276AE #3696D8

Accessibility & contrast

On white

8.20

#18537B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.56

#18537B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #18537B

8.20:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##18537B	#FFFFFF	#000000	##FFFFFF
##18537B	1.00	8.20	2.56	8.20
#FFFFFF	8.20	1.00	21.00	1.00
#000000	2.56	21.00	1.00	21.00
##FFFFFF	8.20	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#40547D

Deuteranopia (green-blind)

#334B7A

Tritanopia (blue-blind)

#005D61

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #18537b;
/* rgb */ color: rgb(24, 83, 123);
/* oklch */ color: oklch(42.5% 0.089 243.1);

Tailwind

colors: {
  custom: {
    50: '#6583a1',
    500: '#18537b',
    950: '#000000',
  },
}

SCSS

$custom: #18537b;
$custom-light: #6583a1;
$custom-dark: #000000;

JSON

{
  "hex": "#18537b",
  "rgb": {
    "r": 24,
    "g": 83,
    "b": 123
  },
  "hsl": {
    "h": 204.242,
    "s": 67.347,
    "l": 28.824
  },
  "oklch": {
    "l": 0.4253,
    "c": 0.08889,
    "h": 243.1
  },
  "luminance": 0.07811
}

Semantic roles & 50–950 ramp

primary

#18537B

secondary

#B06D3F

accent

#833EEA

background

#F6F7F9

surface

#EBEEF2

border

#C6C9CC

text

#060A0F

muted

#7A7C7E

Preview Lab

Preview with #18537B

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

Preview Lab → · Contrast checker → · Palette generator →