#183F9B#183F9B

#183F9B is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.2% C 0.157 H 263.5°. Best body text is #FFFFFF at 9.45:1 contrast (WCAG AA passes).

Color values

HEX	#183F9B
RGB	rgb(24, 63, 155)
HSL	hsl(222, 73%, 35%)
HSV	hsv(222, 85%, 61%)
CMYK	cmyk(84.5%, 59.4%, 0%, 39.2%)
CIE-LAB	lab(29.70, 22.76, -53.84)
CIE-LCH	lch(29.70, 58.46, 292.92°)
OKLab	oklab(40.22% -0.0177 -0.1557)
OKLCH	oklch(40.22% 0.157 263.5)
XYZ	xyz(8.0685, 6.1148, 31.7590)
Luminance	0.0612 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183F9B #9B7418

analogous

#18819B #183F9B #32189B

triadic

#183F9B #9B183F #3F9B18

tetradic

#183F9B #9B1881 #9B7418 #189B32

square

#183F9B #9B1881 #9B7418 #189B32

split-complementary

#183F9B #9B3218 #819B18

monochromatic

#081431 #102966 #183F9B #2055D0 #4A78E3

Accessibility & contrast

On white

9.45

#183F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.22

#183F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183F9B

9.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183F9B	#FFFFFF	#000000	##FFFFFF
##183F9B	1.00	9.45	2.22	9.45
#FFFFFF	9.45	1.00	21.00	1.00
#000000	2.22	21.00	1.00	21.00
##FFFFFF	9.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004C9E

Deuteranopia (green-blind)

#004099

Tritanopia (blue-blind)

#005666

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #183f9b;
/* rgb */ color: rgb(24, 63, 155);
/* oklch */ color: oklch(40.2% 0.157 263.5);

Tailwind

colors: {
  custom: {
    50: '#6e73b9',
    500: '#183f9b',
    950: '#000000',
  },
}

SCSS

$custom: #183f9b;
$custom-light: #6e73b9;
$custom-dark: #000000;

JSON

{
  "hex": "#183f9b",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 155
  },
  "hsl": {
    "h": 222.137,
    "s": 73.184,
    "l": 35.098
  },
  "oklch": {
    "l": 0.40222,
    "c": 0.15669,
    "h": 263.5
  },
  "luminance": 0.06116
}

Semantic roles & 50–950 ramp

primary

#183F9B

secondary

#C5A04A

accent

#B938F0

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#080812

muted

#7B7B81

Preview Lab

Preview with #183F9B

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

Preview Lab → · Contrast checker → · Palette generator →