#183D5F#183D5F

#183D5F is a dark, moderate cyan. Relative luminance 0.044; OKLCH L 35.1% C 0.073 H 249.0°. Best body text is #FFFFFF at 11.22:1 contrast (WCAG AA passes).

Color values

HEX	#183D5F
RGB	rgb(24, 61, 95)
HSL	hsl(209, 60%, 23%)
HSV	hsv(209, 75%, 37%)
CMYK	cmyk(74.7%, 35.8%, 0%, 62.7%)
CIE-LAB	lab(24.82, -0.45, -24.02)
CIE-LCH	lch(24.82, 24.02, 268.93°)
OKLab	oklab(35.12% -0.0261 -0.0681)
OKLCH	oklch(35.12% 0.073 249)
XYZ	xyz(4.1102, 4.3575, 11.4487)
Luminance	0.0436 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183D5F #5F3A18

analogous

#185F5D #183D5F #181A5F

triadic

#183D5F #5F183D #3D5F18

tetradic

#183D5F #5D185F #5F3A18 #1A5F18

square

#183D5F #5D185F #5F3A18 #1A5F18

split-complementary

#183D5F #5F181A #5F5D18

monochromatic

#061018 #0C1E2E #183D5F #245C90 #317CC1

Accessibility & contrast

On white

11.22

#183D5F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.87

#183D5F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183D5F

11.22:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183D5F	#FFFFFF	#000000	##FFFFFF
##183D5F	1.00	11.22	1.87	11.22
#FFFFFF	11.22	1.00	21.00	1.00
#000000	1.87	21.00	1.00	21.00
##FFFFFF	11.22	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2E3F60

Deuteranopia (green-blind)

#24385E

Tritanopia (blue-blind)

#004549

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #183d5f;
/* rgb */ color: rgb(24, 61, 95);
/* oklch */ color: oklch(35.1% 0.073 249.0);

Tailwind

colors: {
  custom: {
    50: '#5f728c',
    500: '#183d5f',
    950: '#000000',
  },
}

SCSS

$custom: #183d5f;
$custom-light: #5f728c;
$custom-dark: #000000;

JSON

{
  "hex": "#183d5f",
  "rgb": {
    "r": 24,
    "g": 61,
    "b": 95
  },
  "hsl": {
    "h": 208.732,
    "s": 59.664,
    "l": 23.333
  },
  "oklch": {
    "l": 0.35117,
    "c": 0.07296,
    "h": 249
  },
  "luminance": 0.04358
}

Semantic roles & 50–950 ramp

primary

#183D5F

secondary

#95683D

accent

#9145E3

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070C

muted

#797A7D

Preview Lab

Preview with #183D5F

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

Preview Lab → · Contrast checker → · Palette generator →