#283C8F#283C8F

#283C8F is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.2% C 0.139 H 268.8°. Best body text is #FFFFFF at 9.84:1 contrast (WCAG AA passes).

Color values

HEX	#283C8F
RGB	rgb(40, 60, 143)
HSL	hsl(228, 56%, 36%)
HSV	hsv(228, 72%, 56%)
CMYK	cmyk(72%, 58%, 0%, 43.9%)
CIE-LAB	lab(28.55, 21.92, -48.34)
CIE-LCH	lch(28.55, 53.08, 294.39°)
OKLab	oklab(39.24% -0.0029 -0.1393)
OKLCH	oklch(39.24% 0.139 268.8)
XYZ	xyz(7.4472, 5.6653, 26.6823)
Luminance	0.0567 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283C8F #8F7B28

analogous

#286F8F #283C8F #48288F

triadic

#283C8F #8F283C #3C8F28

tetradic

#283C8F #8F286F #8F7B28 #288F48

square

#283C8F #8F286F #8F7B28 #288F48

split-complementary

#283C8F #8F4828 #6F8F28

monochromatic

#0D142F #1B285F #283C8F #3550BF #5F75D2

Accessibility & contrast

On white

9.84

#283C8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.13

#283C8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283C8F

9.84:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283C8F	#FFFFFF	#000000	##FFFFFF
##283C8F	1.00	9.84	2.13	9.84
#FFFFFF	9.84	1.00	21.00	1.00
#000000	2.13	21.00	1.00	21.00
##FFFFFF	9.84	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004892

Deuteranopia (green-blind)

#003F8D

Tritanopia (blue-blind)

#00505F

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #283c8f;
/* rgb */ color: rgb(40, 60, 143);
/* oklch */ color: oklch(39.2% 0.139 268.8);

Tailwind

colors: {
  custom: {
    50: '#7071b0',
    500: '#283c8f',
    950: '#000000',
  },
}

SCSS

$custom: #283c8f;
$custom-light: #7071b0;
$custom-dark: #000000;

JSON

{
  "hex": "#283c8f",
  "rgb": {
    "r": 40,
    "g": 60,
    "b": 143
  },
  "hsl": {
    "h": 228.35,
    "s": 56.284,
    "l": 35.882
  },
  "oklch": {
    "l": 0.39237,
    "c": 0.13931,
    "h": 268.8
  },
  "luminance": 0.05666
}

Semantic roles & 50–950 ramp

primary

#283C8F

secondary

#B8A65B

accent

#C248E0

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080711

muted

#7B7A80

Preview Lab

Preview with #283C8F

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

Preview Lab → · Contrast checker → · Palette generator →