#283B8F#283B8F

#283B8F is a dark, vivid blue. Relative luminance 0.056; OKLCH L 39.0% C 0.141 H 269.2°. Best body text is #FFFFFF at 9.94:1 contrast (WCAG AA passes).

Color values

HEX	#283B8F
RGB	rgb(40, 59, 143)
HSL	hsl(229, 56%, 36%)
HSV	hsv(229, 72%, 56%)
CMYK	cmyk(72%, 58.7%, 0%, 43.9%)
CIE-LAB	lab(28.28, 22.60, -48.79)
CIE-LCH	lch(28.28, 53.77, 294.86°)
OKLab	oklab(39.03% -0.002 -0.1406)
OKLCH	oklch(39.03% 0.141 269.2)
XYZ	xyz(7.3953, 5.5615, 26.6650)
Luminance	0.0556 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B8F #8F7C28

analogous

#286E8F #283B8F #48288F

triadic

#283B8F #8F283B #3B8F28

tetradic

#283B8F #8F286E #8F7C28 #288F48

square

#283B8F #8F286E #8F7C28 #288F48

split-complementary

#283B8F #8F4828 #6E8F28

monochromatic

#0D142F #1B275F #283B8F #354FBF #5F74D2

Accessibility & contrast

On white

9.94

#283B8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.11

#283B8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B8F

9.94:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B8F	#FFFFFF	#000000	##FFFFFF
##283B8F	1.00	9.94	2.11	9.94
#FFFFFF	9.94	1.00	21.00	1.00
#000000	2.11	21.00	1.00	21.00
##FFFFFF	9.94	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004892

Deuteranopia (green-blind)

#003E8D

Tritanopia (blue-blind)

#00505F

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #283b8f;
/* rgb */ color: rgb(40, 59, 143);
/* oklch */ color: oklch(39.0% 0.141 269.2);

Tailwind

colors: {
  custom: {
    50: '#7070b0',
    500: '#283b8f',
    950: '#000000',
  },
}

SCSS

$custom: #283b8f;
$custom-light: #7070b0;
$custom-dark: #000000;

JSON

{
  "hex": "#283b8f",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 143
  },
  "hsl": {
    "h": 228.932,
    "s": 56.284,
    "l": 35.882
  },
  "oklch": {
    "l": 0.39032,
    "c": 0.14061,
    "h": 269.2
  },
  "luminance": 0.05562
}

Semantic roles & 50–950 ramp

primary

#283B8F

secondary

#B8A75B

accent

#C448E0

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080711

muted

#7B7A80

Preview Lab

Preview with #283B8F

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

Preview Lab → · Contrast checker → · Palette generator →