#143D8B#143D8B

#143D8B is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.3% C 0.138 H 261.6°. Best body text is #FFFFFF at 10.14:1 contrast (WCAG AA passes).

Color values

HEX	#143D8B
RGB	rgb(20, 61, 139)
HSL	hsl(219, 75%, 31%)
HSV	hsv(219, 86%, 55%)
CMYK	cmyk(85.6%, 56.1%, 0%, 45.5%)
CIE-LAB	lab(27.71, 17.28, -47.28)
CIE-LCH	lch(27.71, 50.34, 290.07°)
OKLab	oklab(38.28% -0.02 -0.1365)
OKLCH	oklch(38.28% 0.138 261.6)
XYZ	xyz(6.6157, 5.3495, 25.1050)
Luminance	0.0535 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#143D8B #8B6214

analogous

#14788B #143D8B #26148B

triadic

#143D8B #8B143D #3D8B14

tetradic

#143D8B #8B1478 #8B6214 #148B26

square

#143D8B #8B1478 #8B6214 #148B26

split-complementary

#143D8B #8B2614 #788B14

monochromatic

#050E20 #0C2655 #143D8B #1C54C1 #3772E2

Accessibility & contrast

On white

10.14

#143D8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.07

#143D8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #143D8B

10.14:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##143D8B	#FFFFFF	#000000	##FFFFFF
##143D8B	1.00	10.14	2.07	10.14
#FFFFFF	10.14	1.00	21.00	1.00
#000000	2.07	21.00	1.00	21.00
##FFFFFF	10.14	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478E

Deuteranopia (green-blind)

#003C89

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #143d8b;
/* rgb */ color: rgb(20, 61, 139);
/* oklch */ color: oklch(38.3% 0.138 261.6);

Tailwind

colors: {
  custom: {
    50: '#6971ae',
    500: '#143d8b',
    950: '#000000',
  },
}

SCSS

$custom: #143d8b;
$custom-light: #6971ae;
$custom-dark: #000000;

JSON

{
  "hex": "#143d8b",
  "rgb": {
    "r": 20,
    "g": 61,
    "b": 139
  },
  "hsl": {
    "h": 219.328,
    "s": 74.843,
    "l": 31.176
  },
  "oklch": {
    "l": 0.38277,
    "c": 0.13796,
    "h": 261.6
  },
  "luminance": 0.0535
}

Semantic roles & 50–950 ramp

primary

#143D8B

secondary

#BF923C

accent

#B136F1

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#070710

muted

#7A7A7F

Preview Lab

Preview with #143D8B

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

Preview Lab → · Contrast checker → · Palette generator →