#18404B#18404B

#18404B is a dark, muted cyan. Relative luminance 0.044; OKLCH L 34.8% C 0.048 H 218.8°. Best body text is #FFFFFF at 11.21:1 contrast (WCAG AA passes).

Color values

HEX	#18404B
RGB	rgb(24, 64, 75)
HSL	hsl(193, 52%, 19%)
HSV	hsv(193, 68%, 29%)
CMYK	cmyk(68%, 14.7%, 0%, 70.6%)
CIE-LAB	lab(24.85, -10.07, -10.87)
CIE-LCH	lch(24.85, 14.82, 227.17°)
OKLab	oklab(34.82% -0.0376 -0.0302)
OKLCH	oklch(34.82% 0.048 218.8)
XYZ	xyz(3.4796, 4.3686, 7.3151)
Luminance	0.0437 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#18404B #4B2318

analogous

#184B3D #18404B #18274B

triadic

#18404B #4B1840 #404B18

tetradic

#18404B #3D184B #4B2318 #274B18

square

#18404B #3D184B #4B2318 #274B18

split-complementary

#18404B #4B1827 #4B3D18

monochromatic

#071417 #09181D #18404B #276879 #368FA8

Accessibility & contrast

On white

11.21

#18404B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#18404B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #18404B

11.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##18404B	#FFFFFF	#000000	##FFFFFF
##18404B	1.00	11.21	1.87	11.21
#FFFFFF	11.21	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.21	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#393E4C

Deuteranopia (green-blind)

#32394B

Tritanopia (blue-blind)

#004443

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #18404b;
/* rgb */ color: rgb(24, 64, 75);
/* oklch */ color: oklch(34.8% 0.048 218.8);

Tailwind

colors: {
  custom: {
    50: '#5b747d',
    500: '#18404b',
    950: '#000000',
  },
}

SCSS

$custom: #18404b;
$custom-light: #5b747d;
$custom-dark: #000000;

JSON

{
  "hex": "#18404b",
  "rgb": {
    "r": 24,
    "g": 64,
    "b": 75
  },
  "hsl": {
    "h": 192.941,
    "s": 51.515,
    "l": 19.412
  },
  "oklch": {
    "l": 0.34818,
    "c": 0.04826,
    "h": 218.8
  },
  "luminance": 0.04369
}

Semantic roles & 50–950 ramp

primary

#18404B

secondary

#824C3D

accent

#6B4DDB

background

#F5F7F7

surface

#E9EDEE

border

#C5C8C9

text

#040809

muted

#797B7B

Preview Lab

Preview with #18404B

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

Preview Lab → · Contrast checker → · Palette generator →