#183E5B#183E5B

#183E5B is a dark, moderate cyan. Relative luminance 0.044; OKLCH L 35.1% C 0.066 H 244.5°. Best body text is #FFFFFF at 11.18:1 contrast (WCAG AA passes).

Color values

HEX	#183E5B
RGB	rgb(24, 62, 91)
HSL	hsl(206, 58%, 23%)
HSV	hsv(206, 74%, 36%)
CMYK	cmyk(73.6%, 31.9%, 0%, 64.3%)
CIE-LAB	lab(24.93, -2.71, -21.24)
CIE-LCH	lch(24.93, 21.41, 262.72°)
OKLab	oklab(35.14% -0.0286 -0.06)
OKLCH	oklch(35.14% 0.066 244.5)
XYZ	xyz(3.9869, 4.3943, 10.5336)
Luminance	0.0440 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183E5B #5B3518

analogous

#185B56 #183E5B #181D5B

triadic

#183E5B #5B183E #3E5B18

tetradic

#183E5B #56185B #5B3518 #1D5B18

square

#183E5B #56185B #5B3518 #1D5B18

split-complementary

#183E5B #5B181D #5B5618

monochromatic

#061018 #0B1D2B #183E5B #255F8B #3280BC

Accessibility & contrast

On white

11.18

#183E5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.88

#183E5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183E5B

11.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183E5B	#FFFFFF	#000000	##FFFFFF
##183E5B	1.00	11.18	1.88	11.18
#FFFFFF	11.18	1.00	21.00	1.00
#000000	1.88	21.00	1.00	21.00
##FFFFFF	11.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#313F5C

Deuteranopia (green-blind)

#28385A

Tritanopia (blue-blind)

#004548

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183e5b;
/* rgb */ color: rgb(24, 62, 91);
/* oklch */ color: oklch(35.1% 0.066 244.5);

Tailwind

colors: {
  custom: {
    50: '#5e7389',
    500: '#183e5b',
    950: '#000000',
  },
}

SCSS

$custom: #183e5b;
$custom-light: #5e7389;
$custom-dark: #000000;

JSON

{
  "hex": "#183e5b",
  "rgb": {
    "r": 24,
    "g": 62,
    "b": 91
  },
  "hsl": {
    "h": 205.97,
    "s": 58.261,
    "l": 22.549
  },
  "oklch": {
    "l": 0.35135,
    "c": 0.06648,
    "h": 244.5
  },
  "luminance": 0.04395
}

Semantic roles & 50–950 ramp

primary

#183E5B

secondary

#92623D

accent

#8946E1

background

#F5F6F8

surface

#E9ECF0

border

#C5C7CB

text

#05080B

muted

#797B7C

Preview Lab

Preview with #183E5B

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

Preview Lab → · Contrast checker → · Palette generator →