#283CB0#283CB0

#283CB0 is a dark, vivid blue. Relative luminance 0.068; OKLCH L 42.2% C 0.184 H 269.0°. Best body text is #FFFFFF at 8.89:1 contrast (WCAG AA passes).

Color values

HEX	#283CB0
RGB	rgb(40, 60, 176)
HSL	hsl(231, 63%, 42%)
HSV	hsv(231, 77%, 69%)
CMYK	cmyk(77.3%, 65.9%, 0%, 31%)
CIE-LAB	lab(31.39, 34.32, -63.70)
CIE-LCH	lch(31.39, 72.36, 298.32°)
OKLab	oklab(42.21% -0.0033 -0.1843)
OKLCH	oklch(42.21% 0.184 269)
XYZ	xyz(10.3247, 6.8163, 41.8374)
Luminance	0.0682 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283CB0 #B09C28

analogous

#2880B0 #283CB0 #5828B0

triadic

#283CB0 #B0283C #3CB028

tetradic

#283CB0 #B02880 #B09C28 #28B058

square

#283CB0 #B02880 #B09C28 #28B058

split-complementary

#283CB0 #B05828 #80B028

monochromatic

#111A4C #1D2B7E #283CB0 #4157D4 #7383DF

Accessibility & contrast

On white

8.89

#283CB0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.36

#283CB0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283CB0

8.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283CB0	#FFFFFF	#000000	##FFFFFF
##283CB0	1.00	8.89	2.36	8.89
#FFFFFF	8.89	1.00	21.00	1.00
#000000	2.36	21.00	1.00	21.00
##FFFFFF	8.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0050B4

Deuteranopia (green-blind)

#0043AE

Tritanopia (blue-blind)

#005B70

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #283cb0;
/* rgb */ color: rgb(40, 60, 176);
/* oklch */ color: oklch(42.2% 0.184 269.0);

Tailwind

colors: {
  custom: {
    50: '#7871c9',
    500: '#283cb0',
    950: '#000000',
  },
}

SCSS

$custom: #283cb0;
$custom-light: #7871c9;
$custom-dark: #000000;

JSON

{
  "hex": "#283cb0",
  "rgb": {
    "r": 40,
    "g": 60,
    "b": 176
  },
  "hsl": {
    "h": 231.176,
    "s": 62.963,
    "l": 42.353
  },
  "oklch": {
    "l": 0.42212,
    "c": 0.18436,
    "h": 269
  },
  "luminance": 0.06817
}

Semantic roles & 50–950 ramp

primary

#283CB0

secondary

#C6B96D

accent

#CE42E6

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #283CB0

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

Preview Lab → · Contrast checker → · Palette generator →