#283A8D#283A8D

#283A8D is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.7% C 0.139 H 269.5°. Best body text is #FFFFFF at 10.10:1 contrast (WCAG AA passes).

Color values

HEX	#283A8D
RGB	rgb(40, 58, 141)
HSL	hsl(229, 56%, 35%)
HSV	hsv(229, 72%, 55%)
CMYK	cmyk(71.6%, 58.9%, 0%, 44.7%)
CIE-LAB	lab(27.84, 22.52, -48.26)
CIE-LCH	lch(27.84, 53.25, 295.02°)
OKLab	oklab(38.66% -0.0012 -0.1391)
OKLCH	oklch(38.66% 0.139 269.5)
XYZ	xyz(7.1942, 5.3996, 25.8572)
Luminance	0.0540 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283A8D #8D7B28

analogous

#286C8D #283A8D #48288D

triadic

#283A8D #8D283A #3A8D28

tetradic

#283A8D #8D286C #8D7B28 #288D48

square

#283A8D #8D286C #8D7B28 #288D48

split-complementary

#283A8D #8D4828 #6C8D28

monochromatic

#0D132E #1A265D #283A8D #364EBD #5E73D1

Accessibility & contrast

On white

10.10

#283A8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#283A8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283A8D

10.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283A8D	#FFFFFF	#000000	##FFFFFF
##283A8D	1.00	10.10	2.08	10.10
#FFFFFF	10.10	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.10	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004790

Deuteranopia (green-blind)

#003D8B

Tritanopia (blue-blind)

#004E5D

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #283a8d;
/* rgb */ color: rgb(40, 58, 141);
/* oklch */ color: oklch(38.7% 0.139 269.5);

Tailwind

colors: {
  custom: {
    50: '#706faf',
    500: '#283a8d',
    950: '#000000',
  },
}

SCSS

$custom: #283a8d;
$custom-light: #706faf;
$custom-dark: #000000;

JSON

{
  "hex": "#283a8d",
  "rgb": {
    "r": 40,
    "g": 58,
    "b": 141
  },
  "hsl": {
    "h": 229.307,
    "s": 55.801,
    "l": 35.49
  },
  "oklch": {
    "l": 0.38657,
    "c": 0.13907,
    "h": 269.5
  },
  "luminance": 0.054
}

Semantic roles & 50–950 ramp

primary

#283A8D

secondary

#B7A65A

accent

#C449DF

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283A8D

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

Preview Lab → · Contrast checker → · Palette generator →