#283B66#283B66

#283B66 is a dark, moderate blue. Relative luminance 0.045; OKLCH L 35.9% C 0.079 H 264.7°. Best body text is #FFFFFF at 11.01:1 contrast (WCAG AA passes).

Color values

HEX	#283B66
RGB	rgb(40, 59, 102)
HSL	hsl(222, 44%, 28%)
HSV	hsv(222, 61%, 40%)
CMYK	cmyk(60.8%, 42.2%, 0%, 60%)
CIE-LAB	lab(25.38, 6.94, -27.62)
CIE-LCH	lch(25.38, 28.48, 284.10°)
OKLab	oklab(35.9% -0.0072 -0.0784)
OKLCH	oklch(35.9% 0.079 264.7)
XYZ	xyz(4.8365, 4.5380, 13.1888)
Luminance	0.0454 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B66 #665328

analogous

#285A66 #283B66 #342866

triadic

#283B66 #66283B #3B6628

tetradic

#283B66 #66285A #665328 #286634

square

#283B66 #66285A #665328 #286634

split-complementary

#283B66 #663428 #5A6628

monochromatic

#090D16 #17223A #283B66 #395492 #4F6FBA

Accessibility & contrast

On white

11.01

#283B66 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.91

#283B66 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B66

11.01:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B66	#FFFFFF	#000000	##FFFFFF
##283B66	1.00	11.01	1.91	11.01
#FFFFFF	11.01	1.00	21.00	1.00
#000000	1.91	21.00	1.00	21.00
##FFFFFF	11.01	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#293F68

Deuteranopia (green-blind)

#213A65

Tritanopia (blue-blind)

#00454B

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #283b66;
/* rgb */ color: rgb(40, 59, 102);
/* oklch */ color: oklch(35.9% 0.079 264.7);

Tailwind

colors: {
  custom: {
    50: '#687092',
    500: '#283b66',
    950: '#000000',
  },
}

SCSS

$custom: #283b66;
$custom-light: #687092;
$custom-dark: #000000;

JSON

{
  "hex": "#283b66",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 102
  },
  "hsl": {
    "h": 221.613,
    "s": 43.662,
    "l": 27.843
  },
  "oklch": {
    "l": 0.35901,
    "c": 0.07872,
    "h": 264.7
  },
  "luminance": 0.04538
}

Semantic roles & 50–950 ramp

primary

#283B66

secondary

#998351

accent

#AC54D3

background

#F6F6F9

surface

#EBECF1

border

#C6C7CB

text

#06070D

muted

#7A7A7E

Preview Lab

Preview with #283B66

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

Preview Lab → · Contrast checker → · Palette generator →