#283F81#283F81

#283F81 is a dark, moderate blue. Relative luminance 0.056; OKLCH L 38.8% C 0.115 H 266.6°. Best body text is #FFFFFF at 9.91:1 contrast (WCAG AA passes).

Color values

HEX	#283F81
RGB	rgb(40, 63, 129)
HSL	hsl(224, 53%, 33%)
HSV	hsv(224, 69%, 51%)
CMYK	cmyk(69%, 51.2%, 0%, 49.4%)
CIE-LAB	lab(28.35, 14.47, -39.98)
CIE-LCH	lch(28.35, 42.52, 289.90°)
OKLab	oklab(38.76% -0.0068 -0.1146)
OKLCH	oklch(38.76% 0.115 266.6)
XYZ	xyz(6.6137, 5.5905, 21.4952)
Luminance	0.0559 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F81 #816A28

analogous

#286B81 #283F81 #3D2881

triadic

#283F81 #81283F #3F8128

tetradic

#283F81 #81286B #816A28 #28813D

square

#283F81 #81286B #816A28 #28813D

split-complementary

#283F81 #813D28 #6B8128

monochromatic

#0B1124 #1A2852 #283F81 #3656B0 #5876CB

Accessibility & contrast

On white

9.91

#283F81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#283F81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F81

9.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F81	#FFFFFF	#000000	##FFFFFF
##283F81	1.00	9.91	2.12	9.91
#FFFFFF	9.91	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.91	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1A4783

Deuteranopia (green-blind)

#023F80

Tritanopia (blue-blind)

#004E5A

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #283f81;
/* rgb */ color: rgb(40, 63, 129);
/* oklch */ color: oklch(38.8% 0.115 266.6);

Tailwind

colors: {
  custom: {
    50: '#6d73a6',
    500: '#283f81',
    950: '#000000',
  },
}

SCSS

$custom: #283f81;
$custom-light: #6d73a6;
$custom-dark: #000000;

JSON

{
  "hex": "#283f81",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 129
  },
  "hsl": {
    "h": 224.494,
    "s": 52.663,
    "l": 33.137
  },
  "oklch": {
    "l": 0.38755,
    "c": 0.11483,
    "h": 266.6
  },
  "luminance": 0.05591
}

Semantic roles & 50–950 ramp

primary

#283F81

secondary

#B09954

accent

#B74CDC

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#08080F

muted

#7B7B7F

Preview Lab

Preview with #283F81

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

Preview Lab → · Contrast checker → · Palette generator →