#283D8B#283D8B

#283D8B is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.1% C 0.132 H 268.3°. Best body text is #FFFFFF at 9.86:1 contrast (WCAG AA passes).

Color values

HEX	#283D8B
RGB	rgb(40, 61, 139)
HSL	hsl(227, 55%, 35%)
HSV	hsv(227, 71%, 55%)
CMYK	cmyk(71.2%, 56.1%, 0%, 45.5%)
CIE-LAB	lab(28.52, 19.70, -45.93)
CIE-LCH	lch(28.52, 49.98, 293.22°)
OKLab	oklab(39.11% -0.004 -0.1322)
OKLCH	oklch(39.11% 0.132 268.3)
XYZ	xyz(7.2024, 5.6520, 25.1325)
Luminance	0.0565 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283D8B #8B7628

analogous

#286E8B #283D8B #45288B

triadic

#283D8B #8B283D #3D8B28

tetradic

#283D8B #8B286E #8B7628 #288B45

square

#283D8B #8B286E #8B7628 #288B45

split-complementary

#283D8B #8B4528 #6E8B28

monochromatic

#0D132C #1A285B #283D8B #3652BB #5D75D0

Accessibility & contrast

On white

9.86

#283D8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.13

#283D8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283D8B

9.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283D8B	#FFFFFF	#000000	##FFFFFF
##283D8B	1.00	9.86	2.13	9.86
#FFFFFF	9.86	1.00	21.00	1.00
#000000	2.13	21.00	1.00	21.00
##FFFFFF	9.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00488E

Deuteranopia (green-blind)

#003F89

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #283d8b;
/* rgb */ color: rgb(40, 61, 139);
/* oklch */ color: oklch(39.1% 0.132 268.3);

Tailwind

colors: {
  custom: {
    50: '#6f72ad',
    500: '#283d8b',
    950: '#000000',
  },
}

SCSS

$custom: #283d8b;
$custom-light: #6f72ad;
$custom-dark: #000000;

JSON

{
  "hex": "#283d8b",
  "rgb": {
    "r": 40,
    "g": 61,
    "b": 139
  },
  "hsl": {
    "h": 227.273,
    "s": 55.307,
    "l": 35.098
  },
  "oklch": {
    "l": 0.39112,
    "c": 0.13223,
    "h": 268.3
  },
  "luminance": 0.05653
}

Semantic roles & 50–950 ramp

primary

#283D8B

secondary

#B6A259

accent

#BF49DF

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283D8B

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

Preview Lab → · Contrast checker → · Palette generator →