#183FA1#183FA1

#183FA1 is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.8% C 0.165 H 263.9°. Best body text is #FFFFFF at 9.27:1 contrast (WCAG AA passes).

Color values

HEX	#183FA1
RGB	rgb(24, 63, 161)
HSL	hsl(223, 74%, 36%)
HSV	hsv(223, 85%, 63%)
CMYK	cmyk(85.1%, 60.9%, 0%, 36.9%)
CIE-LAB	lab(30.21, 25.16, -56.65)
CIE-LCH	lch(30.21, 61.99, 293.95°)
OKLab	oklab(40.76% -0.0174 -0.1639)
OKLCH	oklch(40.76% 0.165 263.9)
XYZ	xyz(8.5849, 6.3214, 34.4790)
Luminance	0.0632 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#183FA1 #A17A18

analogous

#1884A1 #183FA1 #3618A1

triadic

#183FA1 #A1183F #3FA118

tetradic

#183FA1 #A11884 #A17A18 #18A136

square

#183FA1 #A11884 #A17A18 #18A136

split-complementary

#183FA1 #A13618 #84A118

monochromatic

#081536 #102A6C #183FA1 #2054D6 #4F79E5

Accessibility & contrast

On white

9.27

#183FA1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#183FA1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #183FA1

9.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##183FA1	#FFFFFF	#000000	##FFFFFF
##183FA1	1.00	9.27	2.26	9.27
#FFFFFF	9.27	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EA4

Deuteranopia (green-blind)

#00419F

Tritanopia (blue-blind)

#00586A

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #183fa1;
/* rgb */ color: rgb(24, 63, 161);
/* oklch */ color: oklch(40.8% 0.165 263.9);

Tailwind

colors: {
  custom: {
    50: '#6f73be',
    500: '#183fa1',
    950: '#000000',
  },
}

SCSS

$custom: #183fa1;
$custom-light: #6f73be;
$custom-dark: #000000;

JSON

{
  "hex": "#183fa1",
  "rgb": {
    "r": 24,
    "g": 63,
    "b": 161
  },
  "hsl": {
    "h": 222.92,
    "s": 74.054,
    "l": 36.275
  },
  "oklch": {
    "l": 0.40762,
    "c": 0.16484,
    "h": 263.9
  },
  "luminance": 0.06322
}

Semantic roles & 50–950 ramp

primary

#183FA1

secondary

#C7A44E

accent

#BC37F1

background

#F7F6FB

surface

#EDECF7

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #183FA1

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

Preview Lab → · Contrast checker → · Palette generator →