#283D8A#283D8A

#283D8A is a dark, vivid blue. Relative luminance 0.056; OKLCH L 39.0% C 0.131 H 268.2°. Best body text is #FFFFFF at 9.88:1 contrast (WCAG AA passes).

Color values

HEX	#283D8A
RGB	rgb(40, 61, 138)
HSL	hsl(227, 55%, 35%)
HSV	hsv(227, 71%, 54%)
CMYK	cmyk(71%, 55.8%, 0%, 45.9%)
CIE-LAB	lab(28.44, 19.32, -45.44)
CIE-LCH	lch(28.44, 49.37, 293.03°)
OKLab	oklab(39.03% -0.004 -0.1307)
OKLCH	oklch(39.03% 0.131 268.2)
XYZ	xyz(7.1297, 5.6229, 24.7494)
Luminance	0.0562 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283D8A #8A7528

analogous

#286E8A #283D8A #44288A

triadic

#283D8A #8A283D #3D8A28

tetradic

#283D8A #8A286E #8A7528 #288A44

square

#283D8A #8A286E #8A7528 #288A44

split-complementary

#283D8A #8A4428 #6E8A28

monochromatic

#0C132B #1A285B #283D8A #3652B9 #5D75D0

Accessibility & contrast

On white

9.88

#283D8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#283D8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283D8A

9.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283D8A	#FFFFFF	#000000	##FFFFFF
##283D8A	1.00	9.88	2.12	9.88
#FFFFFF	9.88	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#01488D

Deuteranopia (green-blind)

#003F88

Tritanopia (blue-blind)

#00505D

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #283d8a;
/* rgb */ color: rgb(40, 61, 138);
/* oklch */ color: oklch(39.0% 0.131 268.2);

Tailwind

colors: {
  custom: {
    50: '#6f72ad',
    500: '#283d8a',
    950: '#000000',
  },
}

SCSS

$custom: #283d8a;
$custom-light: #6f72ad;
$custom-dark: #000000;

JSON

{
  "hex": "#283d8a",
  "rgb": {
    "r": 40,
    "g": 61,
    "b": 138
  },
  "hsl": {
    "h": 227.143,
    "s": 55.056,
    "l": 34.902
  },
  "oklch": {
    "l": 0.3903,
    "c": 0.13078,
    "h": 268.2
  },
  "luminance": 0.05624
}

Semantic roles & 50–950 ramp

primary

#283D8A

secondary

#B5A159

accent

#BE49DE

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283D8A

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

Preview Lab → · Contrast checker → · Palette generator →