#183F8F#183F8F

#183F8F is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.2% C 0.140 H 262.4°. Best body text is #FFFFFF at 9.78:1 contrast (WCAG AA passes).

Color values

HEX	#183F8F
RGB	rgb(24, 63, 143)
HSL	hsl(220, 71%, 33%)
HSV	hsv(220, 83%, 56%)
CMYK	cmyk(83.2%, 55.9%, 0%, 43.9%)
CIE-LAB	lab(28.72, 17.90, -48.09)
CIE-LCH	lch(28.72, 51.31, 290.41°)
OKLab	oklab(39.18% -0.0185 -0.1388)
OKLCH	oklch(39.18% 0.14 262.4)
XYZ	xyz(7.1103, 5.7315, 26.7128)
Luminance	0.0573 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F8F #8F6818

analogous

#187A8F #183F8F #2C188F

triadic

#183F8F #8F183F #3F8F18

tetradic

#183F8F #8F187A #8F6818 #188F2C

square

#183F8F #8F187A #8F6818 #188F2C

split-complementary

#183F8F #8F2C18 #7A8F18

monochromatic

#061126 #0F285B #183F8F #2156C3 #4276DF

Accessibility & contrast

On white

9.78

#183F8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.15

#183F8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F8F

9.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F8F	#FFFFFF	#000000	##FFFFFF
##183F8F	1.00	9.78	2.15	9.78
#FFFFFF	9.78	1.00	21.00	1.00
#000000	2.15	21.00	1.00	21.00
##FFFFFF	9.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004992

Deuteranopia (green-blind)

#003F8D

Tritanopia (blue-blind)

#005360

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #183f8f;
/* rgb */ color: rgb(24, 63, 143);
/* oklch */ color: oklch(39.2% 0.140 262.4);

Tailwind

colors: {
  custom: {
    50: '#6b73b0',
    500: '#183f8f',
    950: '#000000',
  },
}

SCSS

$custom: #183f8f;
$custom-light: #6b73b0;
$custom-dark: #000000;

JSON

{
  "hex": "#183f8f",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 143
  },
  "hsl": {
    "h": 220.336,
    "s": 71.257,
    "l": 32.745
  },
  "oklch": {
    "l": 0.39181,
    "c": 0.14002,
    "h": 262.4
  },
  "luminance": 0.05732
}

Semantic roles & 50–950 ramp

primary

#183F8F

secondary

#C09743

accent

#B33AEE

background

#F6F6FA

surface

#ECECF5

border

#C7C7CF

text

#080811

muted

#7A7B80

Preview Lab

Preview with #183F8F

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

Preview Lab → · Contrast checker → · Palette generator →