#283F66#283F66

#283F66 is a dark, moderate blue. Relative luminance 0.050; OKLCH L 36.9% C 0.074 H 260.4°. Best body text is #FFFFFF at 10.54:1 contrast (WCAG AA passes).

Color values

HEX	#283F66
RGB	rgb(40, 63, 102)
HSL	hsl(218, 44%, 28%)
HSV	hsv(218, 61%, 40%)
CMYK	cmyk(60.8%, 38.2%, 0%, 60%)
CIE-LAB	lab(26.63, 4.20, -25.63)
CIE-LCH	lch(26.63, 25.97, 279.31°)
OKLab	oklab(36.88% -0.0122 -0.0725)
OKLCH	oklch(36.88% 0.074 260.4)
XYZ	xyz(5.0500, 4.9650, 13.2600)
Luminance	0.0496 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F66 #664F28

analogous

#285E66 #283F66 #302866

triadic

#283F66 #66283F #3F6628

tetradic

#283F66 #66285E #664F28 #286630

square

#283F66 #66285E #664F28 #286630

split-complementary

#283F66 #663028 #5E6628

monochromatic

#090E16 #17243A #283F66 #395A92 #4F76BA

Accessibility & contrast

On white

10.54

#283F66 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.99

#283F66 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F66

10.54:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F66	#FFFFFF	#000000	##FFFFFF
##283F66	1.00	10.54	1.99	10.54
#FFFFFF	10.54	1.00	21.00	1.00
#000000	1.99	21.00	1.00	21.00
##FFFFFF	10.54	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2F4268

Deuteranopia (green-blind)

#273C65

Tritanopia (blue-blind)

#00484D

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #283f66;
/* rgb */ color: rgb(40, 63, 102);
/* oklch */ color: oklch(36.9% 0.074 260.4);

Tailwind

colors: {
  custom: {
    50: '#687392',
    500: '#283f66',
    950: '#000000',
  },
}

SCSS

$custom: #283f66;
$custom-light: #687392;
$custom-dark: #000000;

JSON

{
  "hex": "#283f66",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 102
  },
  "hsl": {
    "h": 217.742,
    "s": 43.662,
    "l": 27.843
  },
  "oklch": {
    "l": 0.36876,
    "c": 0.07354,
    "h": 260.4
  },
  "luminance": 0.04965
}

Semantic roles & 50–950 ramp

primary

#283F66

secondary

#997E51

accent

#A454D3

background

#F6F6F8

surface

#EBECF0

border

#C6C7CB

text

#06080D

muted

#7A7B7D

Preview Lab

Preview with #283F66

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

Preview Lab → · Contrast checker → · Palette generator →