#283A8A#283A8A

#283A8A is a dark, vivid blue. Relative luminance 0.053; OKLCH L 38.4% C 0.135 H 269.4°. Best body text is #FFFFFF at 10.18:1 contrast (WCAG AA passes).

Color values

HEX	#283A8A
RGB	rgb(40, 58, 138)
HSL	hsl(229, 55%, 35%)
HSV	hsv(229, 71%, 54%)
CMYK	cmyk(71%, 58%, 0%, 45.9%)
CIE-LAB	lab(27.60, 21.37, -46.79)
CIE-LCH	lch(27.60, 51.44, 294.55°)
OKLab	oklab(38.4% -0.0014 -0.1347)
OKLCH	oklch(38.4% 0.135 269.4)
XYZ	xyz(6.9740, 5.3115, 24.6975)
Luminance	0.0531 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283A8A #8A7828

analogous

#286B8A #283A8A #47288A

triadic

#283A8A #8A283A #3A8A28

tetradic

#283A8A #8A286B #8A7828 #288A47

square

#283A8A #8A286B #8A7828 #288A47

split-complementary

#283A8A #8A4728 #6B8A28

monochromatic

#0C122B #1A265B #283A8A #364EB9 #5D72D0

Accessibility & contrast

On white

10.18

#283A8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.06

#283A8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283A8A

10.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283A8A	#FFFFFF	#000000	##FFFFFF
##283A8A	1.00	10.18	2.06	10.18
#FFFFFF	10.18	1.00	21.00	1.00
#000000	2.06	21.00	1.00	21.00
##FFFFFF	10.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468D

Deuteranopia (green-blind)

#003D88

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #283a8a;
/* rgb */ color: rgb(40, 58, 138);
/* oklch */ color: oklch(38.4% 0.135 269.4);

Tailwind

colors: {
  custom: {
    50: '#6f6fad',
    500: '#283a8a',
    950: '#000000',
  },
}

SCSS

$custom: #283a8a;
$custom-light: #6f6fad;
$custom-dark: #000000;

JSON

{
  "hex": "#283a8a",
  "rgb": {
    "r": 40,
    "g": 58,
    "b": 138
  },
  "hsl": {
    "h": 228.98,
    "s": 55.056,
    "l": 34.902
  },
  "oklch": {
    "l": 0.38402,
    "c": 0.13476,
    "h": 269.4
  },
  "luminance": 0.05312
}

Semantic roles & 50–950 ramp

primary

#283A8A

secondary

#B5A459

accent

#C349DE

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283A8A

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

Preview Lab → · Contrast checker → · Palette generator →