#183FB4#183FB4

#183FB4 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.5% C 0.190 H 264.8°. Best body text is #FFFFFF at 8.72:1 contrast (WCAG AA passes).

Color values

HEX	#183FB4
RGB	rgb(24, 63, 180)
HSL	hsl(225, 76%, 40%)
HSV	hsv(225, 87%, 71%)
CMYK	cmyk(86.7%, 65%, 0%, 29.4%)
CIE-LAB	lab(31.91, 32.58, -65.25)
CIE-LCH	lch(31.91, 72.93, 296.53°)
OKLab	oklab(42.54% -0.0173 -0.1891)
OKLCH	oklch(42.54% 0.19 264.8)
XYZ	xyz(10.3895, 7.0432, 43.9830)
Luminance	0.0704 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183FB4 #B48D18

analogous

#188DB4 #183FB4 #3F18B4

triadic

#183FB4 #B4183F #3FB418

tetradic

#183FB4 #B4188D #B48D18 #18B43F

square

#183FB4 #B4188D #B48D18 #18B43F

split-complementary

#183FB4 #B43F18 #8DB418

monochromatic

#0A1948 #112C7E #183FB4 #2756E2 #5D80E9

Accessibility & contrast

On white

8.72

#183FB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.41

#183FB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183FB4

8.72:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183FB4	#FFFFFF	#000000	##FFFFFF
##183FB4	1.00	8.72	2.41	8.72
#FFFFFF	8.72	1.00	21.00	1.00
#000000	2.41	21.00	1.00	21.00
##FFFFFF	8.72	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052B8

Deuteranopia (green-blind)

#0044B2

Tritanopia (blue-blind)

#005E74

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #183fb4;
/* rgb */ color: rgb(24, 63, 180);
/* oklch */ color: oklch(42.5% 0.190 264.8);

Tailwind

colors: {
  custom: {
    50: '#7573cc',
    500: '#183fb4',
    950: '#000000',
  },
}

SCSS

$custom: #183fb4;
$custom-light: #7573cc;
$custom-dark: #000000;

JSON

{
  "hex": "#183fb4",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 180
  },
  "hsl": {
    "h": 225,
    "s": 76.471,
    "l": 40
  },
  "oklch": {
    "l": 0.42542,
    "c": 0.18988,
    "h": 264.8
  },
  "luminance": 0.07044
}

Semantic roles & 50–950 ramp

primary

#183FB4

secondary

#CDB15B

accent

#C335F3

background

#F7F7FC

surface

#EEEDF9

border

#C9C8D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #183FB4

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

Preview Lab → · Contrast checker → · Palette generator →