#283C66#283C66

#283C66 is a dark, moderate blue. Relative luminance 0.046; OKLCH L 36.1% C 0.077 H 263.7°. Best body text is #FFFFFF at 10.89:1 contrast (WCAG AA passes).

Color values

HEX	#283C66
RGB	rgb(40, 60, 102)
HSL	hsl(221, 44%, 28%)
HSV	hsv(221, 61%, 40%)
CMYK	cmyk(60.8%, 41.2%, 0%, 60%)
CIE-LAB	lab(25.69, 6.25, -27.12)
CIE-LCH	lch(25.69, 27.83, 282.98°)
OKLab	oklab(36.14% -0.0085 -0.0769)
OKLCH	oklch(36.14% 0.077 263.7)
XYZ	xyz(4.8884, 4.6417, 13.2061)
Luminance	0.0464 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283C66 #665228

analogous

#285B66 #283C66 #332866

triadic

#283C66 #66283C #3C6628

tetradic

#283C66 #66285B #665228 #286633

square

#283C66 #66285B #665228 #286633

split-complementary

#283C66 #663328 #5B6628

monochromatic

#090D16 #17223A #283C66 #395692 #4F71BA

Accessibility & contrast

On white

10.89

#283C66 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.93

#283C66 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283C66

10.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283C66	#FFFFFF	#000000	##FFFFFF
##283C66	1.00	10.89	1.93	10.89
#FFFFFF	10.89	1.00	21.00	1.00
#000000	1.93	21.00	1.00	21.00
##FFFFFF	10.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2A4068

Deuteranopia (green-blind)

#223A65

Tritanopia (blue-blind)

#00454C

Achromatopsia (no color)

#3D3D3D

Design tokens & code

CSS

--color: #283c66;
/* rgb */ color: rgb(40, 60, 102);
/* oklch */ color: oklch(36.1% 0.077 263.7);

Tailwind

colors: {
  custom: {
    50: '#687192',
    500: '#283c66',
    950: '#000000',
  },
}

SCSS

$custom: #283c66;
$custom-light: #687192;
$custom-dark: #000000;

JSON

{
  "hex": "#283c66",
  "rgb": {
    "r": 40,
    "g": 60,
    "b": 102
  },
  "hsl": {
    "h": 220.645,
    "s": 43.662,
    "l": 27.843
  },
  "oklch": {
    "l": 0.36143,
    "c": 0.07738,
    "h": 263.7
  },
  "luminance": 0.04642
}

Semantic roles & 50–950 ramp

primary

#283C66

secondary

#998251

accent

#AA54D3

background

#F6F6F9

surface

#EBECF1

border

#C6C7CB

text

#06070D

muted

#7A7A7E

Preview Lab

Preview with #283C66

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

Preview Lab → · Contrast checker → · Palette generator →