#283C8A#283C8A

#283C8A is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.8% C 0.132 H 268.6°. Best body text is #FFFFFF at 9.98:1 contrast (WCAG AA passes).

Color values

HEX	#283C8A
RGB	rgb(40, 60, 138)
HSL	hsl(228, 55%, 35%)
HSV	hsv(228, 71%, 54%)
CMYK	cmyk(71%, 56.5%, 0%, 45.9%)
CIE-LAB	lab(28.16, 20.00, -45.89)
CIE-LCH	lch(28.16, 50.06, 293.55°)
OKLab	oklab(38.82% -0.0031 -0.1321)
OKLCH	oklch(38.82% 0.132 268.6)
XYZ	xyz(7.0768, 5.5171, 24.7318)
Luminance	0.0552 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283C8A #8A7628

analogous

#286D8A #283C8A #45288A

triadic

#283C8A #8A283C #3C8A28

tetradic

#283C8A #8A286D #8A7628 #288A45

square

#283C8A #8A286D #8A7628 #288A45

split-complementary

#283C8A #8A4528 #6D8A28

monochromatic

#0C132B #1A275B #283C8A #3651B9 #5D74D0

Accessibility & contrast

On white

9.98

#283C8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#283C8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283C8A

9.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283C8A	#FFFFFF	#000000	##FFFFFF
##283C8A	1.00	9.98	2.10	9.98
#FFFFFF	9.98	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	9.98	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478D

Deuteranopia (green-blind)

#003E88

Tritanopia (blue-blind)

#004F5D

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #283c8a;
/* rgb */ color: rgb(40, 60, 138);
/* oklch */ color: oklch(38.8% 0.132 268.6);

Tailwind

colors: {
  custom: {
    50: '#6f71ad',
    500: '#283c8a',
    950: '#000000',
  },
}

SCSS

$custom: #283c8a;
$custom-light: #6f71ad;
$custom-dark: #000000;

JSON

{
  "hex": "#283c8a",
  "rgb": {
    "r": 40,
    "g": 60,
    "b": 138
  },
  "hsl": {
    "h": 227.755,
    "s": 55.056,
    "l": 34.902
  },
  "oklch": {
    "l": 0.38819,
    "c": 0.13211,
    "h": 268.6
  },
  "luminance": 0.05518
}

Semantic roles & 50–950 ramp

primary

#283C8A

secondary

#B5A259

accent

#C049DE

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283C8A

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

Preview Lab → · Contrast checker → · Palette generator →