#183F6B#183F6B

#183F6B is a dark, moderate cyan. Relative luminance 0.048; OKLCH L 36.4% C 0.088 H 253.6°. Best body text is #FFFFFF at 10.70:1 contrast (WCAG AA passes).

Color values

HEX	#183F6B
RGB	rgb(24, 63, 107)
HSL	hsl(212, 63%, 26%)
HSV	hsv(212, 78%, 42%)
CMYK	cmyk(77.6%, 41.1%, 0%, 58%)
CIE-LAB	lab(26.19, 3.07, -29.59)
CIE-LCH	lch(26.19, 29.75, 275.92°)
OKLab	oklab(36.42% -0.0248 -0.0844)
OKLCH	oklch(36.42% 0.088 253.6)
XYZ	xyz(4.8071, 4.8102, 14.5822)
Luminance	0.0481 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F6B #6B4418

analogous

#18686B #183F6B #1A186B

triadic

#183F6B #6B183F #3F6B18

tetradic

#183F6B #6B1868 #6B4418 #186B1A

square

#183F6B #6B1868 #6B4418 #186B1A

split-complementary

#183F6B #6B1A18 #686B18

monochromatic

#060F19 #0D2239 #183F6B #235C9D #2E7ACF

Accessibility & contrast

On white

10.70

#183F6B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.96

#183F6B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F6B

10.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F6B	#FFFFFF	#000000	##FFFFFF
##183F6B	1.00	10.70	1.96	10.70
#FFFFFF	10.70	1.00	21.00	1.00
#000000	1.96	21.00	1.00	21.00
##FFFFFF	10.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2A426D

Deuteranopia (green-blind)

#1D3A6A

Tritanopia (blue-blind)

#00494F

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #183f6b;
/* rgb */ color: rgb(24, 63, 107);
/* oklch */ color: oklch(36.4% 0.088 253.6);

Tailwind

colors: {
  custom: {
    50: '#617395',
    500: '#183f6b',
    950: '#000000',
  },
}

SCSS

$custom: #183f6b;
$custom-light: #617395;
$custom-dark: #000000;

JSON

{
  "hex": "#183f6b",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 107
  },
  "hsl": {
    "h": 211.807,
    "s": 63.359,
    "l": 25.686
  },
  "oklch": {
    "l": 0.36419,
    "c": 0.08794,
    "h": 253.6
  },
  "luminance": 0.04811
}

Semantic roles & 50–950 ramp

primary

#183F6B

secondary

#A1723E

accent

#9941E6

background

#F6F6F9

surface

#EBECF2

border

#C6C7CC

text

#06080D

muted

#7A7B7E

Preview Lab

Preview with #183F6B

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

Preview Lab → · Contrast checker → · Palette generator →