#283F5A#283F5A

#283F5A is a dark, muted cyan. Relative luminance 0.047; OKLCH L 36.2% C 0.055 H 253.2°. Best body text is #FFFFFF at 10.78:1 contrast (WCAG AA passes).

Color values

HEX	#283F5A
RGB	rgb(40, 63, 90)
HSL	hsl(212, 38%, 25%)
HSV	hsv(212, 56%, 35%)
CMYK	cmyk(55.6%, 30%, 0%, 64.7%)
CIE-LAB	lab(25.99, -0.16, -18.87)
CIE-LCH	lch(25.99, 18.87, 269.53°)
OKLab	oklab(36.16% -0.016 -0.0529)
OKLCH	oklch(36.16% 0.055 253.2)
XYZ	xyz(4.4974, 4.7440, 10.3496)
Luminance	0.0474 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F5A #5A4328

analogous

#28585A #283F5A #2A285A

triadic

#283F5A #5A283F #3F5A28

tetradic

#283F5A #5A2858 #5A4328 #285A2A

square

#283F5A #5A2858 #5A4328 #285A2A

split-complementary

#283F5A #5A2A28 #585A28

monochromatic

#090F15 #152130 #283F5A #3B5D84 #4E7AAF

Accessibility & contrast

On white

10.78

#283F5A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.95

#283F5A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F5A

10.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F5A	#FFFFFF	#000000	##FFFFFF
##283F5A	1.00	10.78	1.95	10.78
#FFFFFF	10.78	1.00	21.00	1.00
#000000	1.95	21.00	1.00	21.00
##FFFFFF	10.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#34405B

Deuteranopia (green-blind)

#2E3B59

Tritanopia (blue-blind)

#0E4548

Achromatopsia (no color)

#3E3E3E

Design tokens & code

CSS

--color: #283f5a;
/* rgb */ color: rgb(40, 63, 90);
/* oklch */ color: oklch(36.2% 0.055 253.2);

Tailwind

colors: {
  custom: {
    50: '#667388',
    500: '#283f5a',
    950: '#000000',
  },
}

SCSS

$custom: #283f5a;
$custom-light: #667388;
$custom-dark: #000000;

JSON

{
  "hex": "#283f5a",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 90
  },
  "hsl": {
    "h": 212.4,
    "s": 38.462,
    "l": 25.49
  },
  "oklch": {
    "l": 0.36164,
    "c": 0.05527,
    "h": 253.2
  },
  "luminance": 0.04744
}

Semantic roles & 50–950 ramp

primary

#283F5A

secondary

#8D7151

accent

#9959CE

background

#F6F7F8

surface

#EBEDF0

border

#C6C8CB

text

#06080B

muted

#7A7B7C

Preview Lab

Preview with #283F5A

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

Preview Lab → · Contrast checker → · Palette generator →