#283B81#283B81

#283B81 is a dark, vivid blue. Relative luminance 0.052; OKLCH L 37.9% C 0.120 H 268.6°. Best body text is #FFFFFF at 10.33:1 contrast (WCAG AA passes).

Color values

HEX	#283B81
RGB	rgb(40, 59, 129)
HSL	hsl(227, 53%, 33%)
HSV	hsv(227, 69%, 51%)
CMYK	cmyk(69%, 54.3%, 0%, 49.4%)
CIE-LAB	lab(27.20, 17.23, -41.85)
CIE-LCH	lch(27.20, 45.26, 292.38°)
OKLab	oklab(37.88% -0.0029 -0.1202)
OKLCH	oklch(37.88% 0.12 268.6)
XYZ	xyz(6.4001, 5.1634, 21.4240)
Luminance	0.0516 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B81 #816E28

analogous

#286781 #283B81 #412881

triadic

#283B81 #81283B #3B8128

tetradic

#283B81 #812867 #816E28 #288141

square

#283B81 #812867 #816E28 #288141

split-complementary

#283B81 #814128 #678128

monochromatic

#0B1024 #1A2652 #283B81 #3650B0 #5871CB

Accessibility & contrast

On white

10.33

#283B81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#283B81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B81

10.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B81	#FFFFFF	#000000	##FFFFFF
##283B81	1.00	10.33	2.03	10.33
#FFFFFF	10.33	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0E4483

Deuteranopia (green-blind)

#003C80

Tritanopia (blue-blind)

#004C58

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #283b81;
/* rgb */ color: rgb(40, 59, 129);
/* oklch */ color: oklch(37.9% 0.120 268.6);

Tailwind

colors: {
  custom: {
    50: '#6d70a6',
    500: '#283b81',
    950: '#000000',
  },
}

SCSS

$custom: #283b81;
$custom-light: #6d70a6;
$custom-dark: #000000;

JSON

{
  "hex": "#283b81",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 129
  },
  "hsl": {
    "h": 227.191,
    "s": 52.663,
    "l": 33.137
  },
  "oklch": {
    "l": 0.37876,
    "c": 0.12023,
    "h": 268.6
  },
  "luminance": 0.05164
}

Semantic roles & 50–950 ramp

primary

#283B81

secondary

#B09D54

accent

#BD4CDC

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#08070F

muted

#7A7A7F

Preview Lab

Preview with #283B81

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

Preview Lab → · Contrast checker → · Palette generator →