#283D78#283D78

#283D78 is a dark, moderate blue. Relative luminance 0.051; OKLCH L 37.6% C 0.104 H 266.7°. Best body text is #FFFFFF at 10.35:1 contrast (WCAG AA passes).

Color values

HEX	#283D78
RGB	rgb(40, 61, 120)
HSL	hsl(224, 50%, 31%)
HSV	hsv(224, 67%, 47%)
CMYK	cmyk(66.7%, 49.2%, 0%, 52.9%)
CIE-LAB	lab(27.14, 12.39, -36.28)
CIE-LCH	lch(27.14, 38.34, 288.85°)
OKLab	oklab(37.63% -0.006 -0.1038)
OKLCH	oklch(37.63% 0.104 266.7)
XYZ	xyz(5.9328, 5.1441, 18.4459)
Luminance	0.0515 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283D78 #786328

analogous

#286578 #283D78 #3B2878

triadic

#283D78 #78283D #3D7828

tetradic

#283D78 #782865 #786328 #28783B

square

#283D78 #782865 #786328 #28783B

split-complementary

#283D78 #783B28 #657828

monochromatic

#090E1C #19264A #283D78 #3754A6 #5472C6

Accessibility & contrast

On white

10.35

#283D78 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.03

#283D78 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283D78

10.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283D78	#FFFFFF	#000000	##FFFFFF
##283D78	1.00	10.35	2.03	10.35
#FFFFFF	10.35	1.00	21.00	1.00
#000000	2.03	21.00	1.00	21.00
##FFFFFF	10.35	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1F447A

Deuteranopia (green-blind)

#103D77

Tritanopia (blue-blind)

#004B54

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #283d78;
/* rgb */ color: rgb(40, 61, 120);
/* oklch */ color: oklch(37.6% 0.104 266.7);

Tailwind

colors: {
  custom: {
    50: '#6b729f',
    500: '#283d78',
    950: '#000000',
  },
}

SCSS

$custom: #283d78;
$custom-light: #6b729f;
$custom-dark: #000000;

JSON

{
  "hex": "#283d78",
  "rgb": {
    "r": 40,
    "g": 61,
    "b": 120
  },
  "hsl": {
    "h": 224.25,
    "s": 50,
    "l": 31.373
  },
  "oklch": {
    "l": 0.37631,
    "c": 0.10396,
    "h": 266.7
  },
  "luminance": 0.05145
}

Semantic roles & 50–950 ramp

primary

#283D78

secondary

#AA9352

accent

#B54EDA

background

#F6F6F9

surface

#ECECF2

border

#C7C7CC

text

#07070E

muted

#7A7A7E

Preview Lab

Preview with #283D78

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

Preview Lab → · Contrast checker → · Palette generator →