#183B8F#183B8F

#183B8F is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.3% C 0.145 H 263.8°. Best body text is #FFFFFF at 10.19:1 contrast (WCAG AA passes).

Color values

HEX	#183B8F
RGB	rgb(24, 59, 143)
HSL	hsl(222, 71%, 33%)
HSV	hsv(222, 83%, 56%)
CMYK	cmyk(83.2%, 58.7%, 0%, 43.9%)
CIE-LAB	lab(27.59, 20.68, -49.95)
CIE-LCH	lch(27.59, 54.06, 292.49°)
OKLab	oklab(38.32% -0.0158 -0.1443)
OKLCH	oklch(38.32% 0.145 263.8)
XYZ	xyz(6.8968, 5.3045, 26.6416)
Luminance	0.0530 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183B8F #8F6C18

analogous

#18768F #183B8F #31188F

triadic

#183B8F #8F183B #3B8F18

tetradic

#183B8F #8F1876 #8F6C18 #188F31

square

#183B8F #8F1876 #8F6C18 #188F31

split-complementary

#183B8F #8F3118 #768F18

monochromatic

#061026 #0F255B #183B8F #2151C3 #4270DF

Accessibility & contrast

On white

10.19

#183B8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#183B8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183B8F

10.19:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183B8F	#FFFFFF	#000000	##FFFFFF
##183B8F	1.00	10.19	2.06	10.19
#FFFFFF	10.19	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.19	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004792

Deuteranopia (green-blind)

#003C8D

Tritanopia (blue-blind)

#00505F

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #183b8f;
/* rgb */ color: rgb(24, 59, 143);
/* oklch */ color: oklch(38.3% 0.145 263.8);

Tailwind

colors: {
  custom: {
    50: '#6b70b1',
    500: '#183b8f',
    950: '#000000',
  },
}

SCSS

$custom: #183b8f;
$custom-light: #6b70b1;
$custom-dark: #000000;

JSON

{
  "hex": "#183b8f",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 143
  },
  "hsl": {
    "h": 222.353,
    "s": 71.257,
    "l": 32.745
  },
  "oklch": {
    "l": 0.38321,
    "c": 0.14517,
    "h": 263.8
  },
  "luminance": 0.05305
}

Semantic roles & 50–950 ramp

primary

#183B8F

secondary

#C09B43

accent

#B93AEE

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#080711

muted

#7B7A80

Preview Lab

Preview with #183B8F

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

Preview Lab → · Contrast checker → · Palette generator →