#283B8E#283B8E

#283B8E is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.9% C 0.139 H 269.1°. Best body text is #FFFFFF at 9.97:1 contrast (WCAG AA passes).

Color values

HEX	#283B8E
RGB	rgb(40, 59, 142)
HSL	hsl(229, 56%, 36%)
HSV	hsv(229, 72%, 56%)
CMYK	cmyk(71.8%, 58.5%, 0%, 44.3%)
CIE-LAB	lab(28.20, 22.22, -48.30)
CIE-LCH	lch(28.20, 53.17, 294.70°)
OKLab	oklab(38.95% -0.0021 -0.1392)
OKLCH	oklch(38.95% 0.139 269.1)
XYZ	xyz(7.3198, 5.5313, 26.2678)
Luminance	0.0553 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B8E #8E7B28

analogous

#286E8E #283B8E #48288E

triadic

#283B8E #8E283B #3B8E28

tetradic

#283B8E #8E286E #8E7B28 #288E48

square

#283B8E #8E286E #8E7B28 #288E48

split-complementary

#283B8E #8E4828 #6E8E28

monochromatic

#0D132F #1B275E #283B8E #354FBE #5F74D2

Accessibility & contrast

On white

9.97

#283B8E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.11

#283B8E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B8E

9.97:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B8E	#FFFFFF	#000000	##FFFFFF
##283B8E	1.00	9.97	2.11	9.97
#FFFFFF	9.97	1.00	21.00	1.00
#000000	2.11	21.00	1.00	21.00
##FFFFFF	9.97	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004791

Deuteranopia (green-blind)

#003E8C

Tritanopia (blue-blind)

#004F5E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #283b8e;
/* rgb */ color: rgb(40, 59, 142);
/* oklch */ color: oklch(38.9% 0.139 269.1);

Tailwind

colors: {
  custom: {
    50: '#7070b0',
    500: '#283b8e',
    950: '#000000',
  },
}

SCSS

$custom: #283b8e;
$custom-light: #7070b0;
$custom-dark: #000000;

JSON

{
  "hex": "#283b8e",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 142
  },
  "hsl": {
    "h": 228.824,
    "s": 56.044,
    "l": 35.686
  },
  "oklch": {
    "l": 0.38947,
    "c": 0.13919,
    "h": 269.1
  },
  "luminance": 0.05532
}

Semantic roles & 50–950 ramp

primary

#283B8E

secondary

#B7A65B

accent

#C348DF

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283B8E

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

Preview Lab → · Contrast checker → · Palette generator →