#183F5F#183F5F

#183F5F is a dark, moderate cyan. Relative luminance 0.046; OKLCH L 35.6% C 0.071 H 246.4°. Best body text is #FFFFFF at 10.97:1 contrast (WCAG AA passes).

Color values

HEX	#183F5F
RGB	rgb(24, 63, 95)
HSL	hsl(207, 60%, 23%)
HSV	hsv(207, 75%, 37%)
CMYK	cmyk(74.7%, 33.7%, 0%, 62.7%)
CIE-LAB	lab(25.49, -1.79, -22.97)
CIE-LCH	lch(25.49, 23.04, 265.54°)
OKLab	oklab(35.64% -0.0284 -0.065)
OKLCH	oklch(35.64% 0.071 246.4)
XYZ	xyz(4.2190, 4.5750, 11.4850)
Luminance	0.0457 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F5F #5F3818

analogous

#185F5B #183F5F #181B5F

triadic

#183F5F #5F183F #3F5F18

tetradic

#183F5F #5B185F #5F3818 #1B5F18

square

#183F5F #5B185F #5F3818 #1B5F18

split-complementary

#183F5F #5F181B #5F5B18

monochromatic

#061018 #0C1F2E #183F5F #245F90 #3180C1

Accessibility & contrast

On white

10.97

#183F5F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.92

#183F5F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F5F

10.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F5F	#FFFFFF	#000000	##FFFFFF
##183F5F	1.00	10.97	1.92	10.97
#FFFFFF	10.97	1.00	21.00	1.00
#000000	1.92	21.00	1.00	21.00
##FFFFFF	10.97	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#314060

Deuteranopia (green-blind)

#27395E

Tritanopia (blue-blind)

#00474A

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #183f5f;
/* rgb */ color: rgb(24, 63, 95);
/* oklch */ color: oklch(35.6% 0.071 246.4);

Tailwind

colors: {
  custom: {
    50: '#5f738c',
    500: '#183f5f',
    950: '#000000',
  },
}

SCSS

$custom: #183f5f;
$custom-light: #5f738c;
$custom-dark: #000000;

JSON

{
  "hex": "#183f5f",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 95
  },
  "hsl": {
    "h": 207.042,
    "s": 59.664,
    "l": 23.333
  },
  "oklch": {
    "l": 0.35643,
    "c": 0.07095,
    "h": 246.4
  },
  "luminance": 0.04575
}

Semantic roles & 50–950 ramp

primary

#183F5F

secondary

#95653D

accent

#8C45E3

background

#F5F7F8

surface

#EAEDF0

border

#C6C8CB

text

#05080C

muted

#797B7D

Preview Lab

Preview with #183F5F

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

Preview Lab → · Contrast checker → · Palette generator →