#283B8A#283B8A

#283B8A is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.6% C 0.133 H 269.0°. Best body text is #FFFFFF at 10.08:1 contrast (WCAG AA passes).

Color values

HEX	#283B8A
RGB	rgb(40, 59, 138)
HSL	hsl(228, 55%, 35%)
HSV	hsv(228, 71%, 54%)
CMYK	cmyk(71%, 57.2%, 0%, 45.9%)
CIE-LAB	lab(27.88, 20.69, -46.34)
CIE-LCH	lch(27.88, 50.75, 294.06°)
OKLab	oklab(38.61% -0.0022 -0.1334)
OKLCH	oklch(38.61% 0.133 269)
XYZ	xyz(7.0249, 5.4133, 24.7145)
Luminance	0.0541 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B8A #8A7728

analogous

#286C8A #283B8A #46288A

triadic

#283B8A #8A283B #3B8A28

tetradic

#283B8A #8A286C #8A7728 #288A46

square

#283B8A #8A286C #8A7728 #288A46

split-complementary

#283B8A #8A4628 #6C8A28

monochromatic

#0C122B #1A275B #283B8A #364FB9 #5D73D0

Accessibility & contrast

On white

10.08

#283B8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#283B8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B8A

10.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B8A	#FFFFFF	#000000	##FFFFFF
##283B8A	1.00	10.08	2.08	10.08
#FFFFFF	10.08	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.08	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468D

Deuteranopia (green-blind)

#003D88

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #283b8a;
/* rgb */ color: rgb(40, 59, 138);
/* oklch */ color: oklch(38.6% 0.133 269.0);

Tailwind

colors: {
  custom: {
    50: '#6f70ad',
    500: '#283b8a',
    950: '#000000',
  },
}

SCSS

$custom: #283b8a;
$custom-light: #6f70ad;
$custom-dark: #000000;

JSON

{
  "hex": "#283b8a",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 138
  },
  "hsl": {
    "h": 228.367,
    "s": 55.056,
    "l": 34.902
  },
  "oklch": {
    "l": 0.3861,
    "c": 0.13343,
    "h": 269
  },
  "luminance": 0.05414
}

Semantic roles & 50–950 ramp

primary

#283B8A

secondary

#B5A359

accent

#C249DE

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283B8A

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

Preview Lab → · Contrast checker → · Palette generator →