#183B58#183B58

#183B58 is a dark, moderate cyan. Relative luminance 0.040; OKLCH L 34.2% C 0.065 H 246.3°. Best body text is #FFFFFF at 11.63:1 contrast (WCAG AA passes).

Color values

HEX	#183B58
RGB	rgb(24, 59, 88)
HSL	hsl(207, 57%, 22%)
HSV	hsv(207, 73%, 35%)
CMYK	cmyk(72.7%, 33%, 0%, 65.5%)
CIE-LAB	lab(23.76, -1.89, -21.12)
CIE-LCH	lch(23.76, 21.20, 264.88°)
OKLab	oklab(34.15% -0.0262 -0.0597)
OKLCH	oklch(34.15% 0.065 246.3)
XYZ	xyz(3.7014, 4.0263, 9.8127)
Luminance	0.0403 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B58 #583518

analogous

#185855 #183B58 #181B58

triadic

#183B58 #58183B #3B5818

tetradic

#183B58 #551858 #583518 #1B5818

square

#183B58 #551858 #583518 #1B5818

split-complementary

#183B58 #58181B #585518

monochromatic

#071018 #0B1B28 #183B58 #255B88 #327BB8

Accessibility & contrast

On white

11.63

#183B58 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.81

#183B58 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B58

11.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B58	#FFFFFF	#000000	##FFFFFF
##183B58	1.00	11.63	1.81	11.63
#FFFFFF	11.63	1.00	21.00	1.00
#000000	1.81	21.00	1.00	21.00
##FFFFFF	11.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2E3C59

Deuteranopia (green-blind)

#253657

Tritanopia (blue-blind)

#004245

Achromatopsia (no color)

#393939

Design tokens & code

CSS

--color: #183b58;
/* rgb */ color: rgb(24, 59, 88);
/* oklch */ color: oklch(34.2% 0.065 246.3);

Tailwind

colors: {
  custom: {
    50: '#5d7087',
    500: '#183b58',
    950: '#000000',
  },
}

SCSS

$custom: #183b58;
$custom-light: #5d7087;
$custom-dark: #000000;

JSON

{
  "hex": "#183b58",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 88
  },
  "hsl": {
    "h": 207.188,
    "s": 57.143,
    "l": 21.961
  },
  "oklch": {
    "l": 0.34154,
    "c": 0.06518,
    "h": 246.3
  },
  "luminance": 0.04027
}

Semantic roles & 50–950 ramp

primary

#183B58

secondary

#8F623D

accent

#8D47E0

background

#F5F6F8

surface

#E9ECEF

border

#C5C7CA

text

#05070B

muted

#797A7C

Preview Lab

Preview with #183B58

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

Preview Lab → · Contrast checker → · Palette generator →