#283B89#283B89

#283B89 is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.5% C 0.132 H 269.0°. Best body text is #FFFFFF at 10.11:1 contrast (WCAG AA passes).

Color values

HEX	#283B89
RGB	rgb(40, 59, 137)
HSL	hsl(228, 55%, 35%)
HSV	hsv(228, 71%, 54%)
CMYK	cmyk(70.8%, 56.9%, 0%, 46.3%)
CIE-LAB	lab(27.80, 20.30, -45.85)
CIE-LCH	lch(27.80, 50.14, 293.89°)
OKLab	oklab(38.53% -0.0023 -0.132)
OKLCH	oklch(38.53% 0.132 269)
XYZ	xyz(6.9528, 5.3845, 24.3350)
Luminance	0.0539 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B89 #897628

analogous

#286C89 #283B89 #452889

triadic

#283B89 #89283B #3B8928

tetradic

#283B89 #89286C #897628 #288945

square

#283B89 #89286C #897628 #288945

split-complementary

#283B89 #894528 #6C8928

monochromatic

#0C122A #1A275A #283B89 #364FB8 #5C73CF

Accessibility & contrast

On white

10.11

#283B89 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#283B89 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B89

10.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B89	#FFFFFF	#000000	##FFFFFF
##283B89	1.00	10.11	2.08	10.11
#FFFFFF	10.11	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00468C

Deuteranopia (green-blind)

#003D87

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #283b89;
/* rgb */ color: rgb(40, 59, 137);
/* oklch */ color: oklch(38.5% 0.132 269.0);

Tailwind

colors: {
  custom: {
    50: '#6f70ac',
    500: '#283b89',
    950: '#000000',
  },
}

SCSS

$custom: #283b89;
$custom-light: #6f70ac;
$custom-dark: #000000;

JSON

{
  "hex": "#283b89",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 137
  },
  "hsl": {
    "h": 228.247,
    "s": 54.802,
    "l": 34.706
  },
  "oklch": {
    "l": 0.38527,
    "c": 0.13198,
    "h": 269
  },
  "luminance": 0.05385
}

Semantic roles & 50–950 ramp

primary

#283B89

secondary

#B5A358

accent

#C14ADE

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283B89

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

Preview Lab → · Contrast checker → · Palette generator →