#283D8D#283D8D

#283D8D is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.3% C 0.135 H 268.4°. Best body text is #FFFFFF at 9.80:1 contrast (WCAG AA passes).

Color values

HEX	#283D8D
RGB	rgb(40, 61, 141)
HSL	hsl(228, 56%, 35%)
HSV	hsv(228, 72%, 55%)
CMYK	cmyk(71.6%, 56.7%, 0%, 44.7%)
CIE-LAB	lab(28.67, 20.47, -46.92)
CIE-LCH	lch(28.67, 51.19, 293.57°)
OKLab	oklab(39.28% -0.0038 -0.1351)
OKLCH	oklch(39.28% 0.135 268.4)
XYZ	xyz(7.3499, 5.7110, 25.9091)
Luminance	0.0571 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283D8D #8D7828

analogous

#286F8D #283D8D #46288D

triadic

#283D8D #8D283D #3D8D28

tetradic

#283D8D #8D286F #8D7828 #288D46

square

#283D8D #8D286F #8D7828 #288D46

split-complementary

#283D8D #8D4628 #6F8D28

monochromatic

#0D142E #1A285D #283D8D #3652BD #5E76D1

Accessibility & contrast

On white

9.80

#283D8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#283D8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283D8D

9.80:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283D8D	#FFFFFF	#000000	##FFFFFF
##283D8D	1.00	9.80	2.14	9.80
#FFFFFF	9.80	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.80	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004890

Deuteranopia (green-blind)

#003F8B

Tritanopia (blue-blind)

#00505F

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #283d8d;
/* rgb */ color: rgb(40, 61, 141);
/* oklch */ color: oklch(39.3% 0.135 268.4);

Tailwind

colors: {
  custom: {
    50: '#7072af',
    500: '#283d8d',
    950: '#000000',
  },
}

SCSS

$custom: #283d8d;
$custom-light: #7072af;
$custom-dark: #000000;

JSON

{
  "hex": "#283d8d",
  "rgb": {
    "r": 40,
    "g": 61,
    "b": 141
  },
  "hsl": {
    "h": 227.525,
    "s": 55.801,
    "l": 35.49
  },
  "oklch": {
    "l": 0.39277,
    "c": 0.13512,
    "h": 268.4
  },
  "luminance": 0.05712
}

Semantic roles & 50–950 ramp

primary

#283D8D

secondary

#B7A35A

accent

#C049DF

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283D8D

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

Preview Lab → · Contrast checker → · Palette generator →