#183B5E#183B5E

#183B5E is a dark, moderate cyan. Relative luminance 0.041; OKLCH L 34.5% C 0.074 H 250.8°. Best body text is #FFFFFF at 11.50:1 contrast (WCAG AA passes).

Color values

HEX	#183B5E
RGB	rgb(24, 59, 94)
HSL	hsl(210, 59%, 23%)
HSV	hsv(210, 74%, 37%)
CMYK	cmyk(74.5%, 37.2%, 0%, 63.1%)
CIE-LAB	lab(24.10, 0.51, -24.51)
CIE-LCH	lch(24.10, 24.52, 271.20°)
OKLab	oklab(34.53% -0.0242 -0.0696)
OKLCH	oklch(34.53% 0.074 250.8)
XYZ	xyz(3.9603, 4.1298, 11.1759)
Luminance	0.0413 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B5E #5E3B18

analogous

#185E5E #183B5E #18185E

triadic

#183B5E #5E183B #3B5E18

tetradic

#183B5E #5E185E #5E3B18 #185E18

square

#183B5E #5E185E #5E3B18 #185E18

split-complementary

#183B5E #5E1818 #5E5E18

monochromatic

#060F18 #0C1C2D #183B5E #245A8F #3178C0

Accessibility & contrast

On white

11.50

#183B5E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.83

#183B5E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B5E

11.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B5E	#FFFFFF	#000000	##FFFFFF
##183B5E	1.00	11.50	1.83	11.50
#FFFFFF	11.50	1.00	21.00	1.00
#000000	1.83	21.00	1.00	21.00
##FFFFFF	11.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2B3D5F

Deuteranopia (green-blind)

#21365D

Tritanopia (blue-blind)

#004348

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #183b5e;
/* rgb */ color: rgb(24, 59, 94);
/* oklch */ color: oklch(34.5% 0.074 250.8);

Tailwind

colors: {
  custom: {
    50: '#5f708c',
    500: '#183b5e',
    950: '#000000',
  },
}

SCSS

$custom: #183b5e;
$custom-light: #5f708c;
$custom-dark: #000000;

JSON

{
  "hex": "#183b5e",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 94
  },
  "hsl": {
    "h": 210,
    "s": 59.322,
    "l": 23.137
  },
  "oklch": {
    "l": 0.3453,
    "c": 0.07367,
    "h": 250.8
  },
  "luminance": 0.0413
}

Semantic roles & 50–950 ramp

primary

#183B5E

secondary

#94693D

accent

#9445E3

background

#F5F6F8

surface

#EAECF0

border

#C6C7CB

text

#05070C

muted

#797A7D

Preview Lab

Preview with #183B5E

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

Preview Lab → · Contrast checker → · Palette generator →