#143F8B#143F8B

#143F8B is a dark, vivid blue. Relative luminance 0.056; OKLCH L 38.7% C 0.135 H 260.9°. Best body text is #FFFFFF at 9.94:1 contrast (WCAG AA passes).

Color values

HEX	#143F8B
RGB	rgb(20, 63, 139)
HSL	hsl(218, 75%, 31%)
HSV	hsv(218, 86%, 55%)
CMYK	cmyk(85.6%, 54.7%, 0%, 45.5%)
CIE-LAB	lab(28.29, 15.88, -46.33)
CIE-LCH	lch(28.29, 48.98, 288.92°)
OKLab	oklab(38.72% -0.0214 -0.1337)
OKLCH	oklch(38.72% 0.135 260.9)
XYZ	xyz(6.7245, 5.5670, 25.1412)
Luminance	0.0557 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#143F8B #8B6014

analogous

#147A8B #143F8B #24148B

triadic

#143F8B #8B143F #3F8B14

tetradic

#143F8B #8B147A #8B6014 #148B24

square

#143F8B #8B147A #8B6014 #148B24

split-complementary

#143F8B #8B2414 #7A8B14

monochromatic

#050F20 #0C2755 #143F8B #1C57C1 #3775E2

Accessibility & contrast

On white

9.94

#143F8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.11

#143F8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #143F8B

9.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##143F8B	#FFFFFF	#000000	##FFFFFF
##143F8B	1.00	9.94	2.11	9.94
#FFFFFF	9.94	1.00	21.00	1.00
#000000	2.11	21.00	1.00	21.00
##FFFFFF	9.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#02488E

Deuteranopia (green-blind)

#003E8A

Tritanopia (blue-blind)

#00525E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #143f8b;
/* rgb */ color: rgb(20, 63, 139);
/* oklch */ color: oklch(38.7% 0.135 260.9);

Tailwind

colors: {
  custom: {
    50: '#6873ad',
    500: '#143f8b',
    950: '#000000',
  },
}

SCSS

$custom: #143f8b;
$custom-light: #6873ad;
$custom-dark: #000000;

JSON

{
  "hex": "#143f8b",
  "rgb": {
    "r": 20,
    "g": 63,
    "b": 139
  },
  "hsl": {
    "h": 218.319,
    "s": 74.843,
    "l": 31.176
  },
  "oklch": {
    "l": 0.3872,
    "c": 0.13538,
    "h": 260.9
  },
  "luminance": 0.05568
}

Semantic roles & 50–950 ramp

primary

#143F8B

secondary

#BF903C

accent

#AE36F1

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070810

muted

#7A7B7F

Preview Lab

Preview with #143F8B

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

Preview Lab → · Contrast checker → · Palette generator →