#283B88#283B88

#283B88 is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.4% C 0.131 H 269.0°. Best body text is #FFFFFF at 10.14:1 contrast (WCAG AA passes).

Color values

HEX	#283B88
RGB	rgb(40, 59, 136)
HSL	hsl(228, 55%, 35%)
HSV	hsv(228, 71%, 53%)
CMYK	cmyk(70.6%, 56.6%, 0%, 46.7%)
CIE-LAB	lab(27.73, 19.92, -45.36)
CIE-LCH	lch(27.73, 49.54, 293.71°)
OKLab	oklab(38.44% -0.0023 -0.1305)
OKLCH	oklch(38.44% 0.131 269)
XYZ	xyz(6.8814, 5.3559, 23.9589)
Luminance	0.0536 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B88 #887528

analogous

#286B88 #283B88 #452888

triadic

#283B88 #88283B #3B8828

tetradic

#283B88 #88286B #887528 #288845

square

#283B88 #88286B #887528 #288845

split-complementary

#283B88 #884528 #6B8828

monochromatic

#0C1229 #1A2659 #283B88 #3650B7 #5B72CF

Accessibility & contrast

On white

10.14

#283B88 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.07

#283B88 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B88

10.14:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B88	#FFFFFF	#000000	##FFFFFF
##283B88	1.00	10.14	2.07	10.14
#FFFFFF	10.14	1.00	21.00	1.00
#000000	2.07	21.00	1.00	21.00
##FFFFFF	10.14	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468B

Deuteranopia (green-blind)

#003D86

Tritanopia (blue-blind)

#004E5B

Achromatopsia (no color)

#414141

Design tokens & code

CSS

--color: #283b88;
/* rgb */ color: rgb(40, 59, 136);
/* oklch */ color: oklch(38.4% 0.131 269.0);

Tailwind

colors: {
  custom: {
    50: '#6f70ab',
    500: '#283b88',
    950: '#000000',
  },
}

SCSS

$custom: #283b88;
$custom-light: #6f70ab;
$custom-dark: #000000;

JSON

{
  "hex": "#283b88",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 136
  },
  "hsl": {
    "h": 228.125,
    "s": 54.545,
    "l": 34.51
  },
  "oklch": {
    "l": 0.38444,
    "c": 0.13053,
    "h": 269
  },
  "luminance": 0.05357
}

Semantic roles & 50–950 ramp

primary

#283B88

secondary

#B4A258

accent

#C14ADE

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283B88

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

Preview Lab → · Contrast checker → · Palette generator →