#183BB4#183BB4

#183BB4 is a dark, vivid blue. Relative luminance 0.066; OKLCH L 41.8% C 0.194 H 265.4°. Best body text is #FFFFFF at 9.04:1 contrast (WCAG AA passes).

Color values

HEX	#183BB4
RGB	rgb(24, 59, 180)
HSL	hsl(227, 76%, 40%)
HSV	hsv(227, 87%, 71%)
CMYK	cmyk(86.7%, 67.2%, 0%, 29.4%)
CIE-LAB	lab(30.92, 35.19, -66.87)
CIE-LCH	lch(30.92, 75.57, 297.76°)
OKLab	oklab(41.82% -0.0156 -0.1939)
OKLCH	oklch(41.82% 0.194 265.4)
XYZ	xyz(10.1760, 6.6161, 43.9119)
Luminance	0.0662 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183BB4 #B49118

analogous

#1889B4 #183BB4 #4318B4

triadic

#183BB4 #B4183B #3BB418

tetradic

#183BB4 #B41889 #B49118 #18B443

square

#183BB4 #B41889 #B49118 #18B443

split-complementary

#183BB4 #B44318 #89B418

monochromatic

#0A1848 #11297E #183BB4 #2751E2 #5D7DE9

Accessibility & contrast

On white

9.04

#183BB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.32

#183BB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183BB4

9.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183BB4	#FFFFFF	#000000	##FFFFFF
##183BB4	1.00	9.04	2.32	9.04
#FFFFFF	9.04	1.00	21.00	1.00
#000000	2.32	21.00	1.00	21.00
##FFFFFF	9.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050B8

Deuteranopia (green-blind)

#0041B2

Tritanopia (blue-blind)

#005C72

Achromatopsia (no color)

#494949

Design tokens & code

CSS

--color: #183bb4;
/* rgb */ color: rgb(24, 59, 180);
/* oklch */ color: oklch(41.8% 0.194 265.4);

Tailwind

colors: {
  custom: {
    50: '#7571cc',
    500: '#183bb4',
    950: '#000000',
  },
}

SCSS

$custom: #183bb4;
$custom-light: #7571cc;
$custom-dark: #000000;

JSON

{
  "hex": "#183bb4",
  "rgb": {
    "r": 24,
    "g": 59,
    "b": 180
  },
  "hsl": {
    "h": 226.538,
    "s": 76.471,
    "l": 40
  },
  "oklch": {
    "l": 0.41815,
    "c": 0.19449,
    "h": 265.4
  },
  "luminance": 0.06617
}

Semantic roles & 50–950 ramp

primary

#183BB4

secondary

#CDB45B

accent

#C835F3

background

#F7F6FC

surface

#EEECF9

border

#C9C7D2

text

#0A0713

muted

#7C7A82

Preview Lab

Preview with #183BB4

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

Preview Lab → · Contrast checker → · Palette generator →