#283DB0#283DB0

#283DB0 is a dark, vivid blue. Relative luminance 0.069; OKLCH L 42.4% C 0.183 H 268.8°. Best body text is #FFFFFF at 8.81:1 contrast (WCAG AA passes).

Color values

HEX	#283DB0
RGB	rgb(40, 61, 176)
HSL	hsl(231, 63%, 42%)
HSV	hsv(231, 77%, 69%)
CMYK	cmyk(77.3%, 65.3%, 0%, 31%)
CIE-LAB	lab(31.63, 33.68, -63.30)
CIE-LCH	lch(31.63, 71.70, 298.02°)
OKLab	oklab(42.39% -0.0039 -0.1831)
OKLCH	oklch(42.39% 0.183 268.8)
XYZ	xyz(10.3776, 6.9220, 41.8550)
Luminance	0.0692 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283DB0 #B09B28

analogous

#2881B0 #283DB0 #5728B0

triadic

#283DB0 #B0283D #3DB028

tetradic

#283DB0 #B02881 #B09B28 #28B057

square

#283DB0 #B02881 #B09B28 #28B057

split-complementary

#283DB0 #B05728 #81B028

monochromatic

#111A4C #1D2C7E #283DB0 #4158D4 #7384DF

Accessibility & contrast

On white

8.81

#283DB0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.38

#283DB0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283DB0

8.81:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283DB0	#FFFFFF	#000000	##FFFFFF
##283DB0	1.00	8.81	2.38	8.81
#FFFFFF	8.81	1.00	21.00	1.00
#000000	2.38	21.00	1.00	21.00
##FFFFFF	8.81	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051B4

Deuteranopia (green-blind)

#0044AE

Tritanopia (blue-blind)

#005C71

Achromatopsia (no color)

#4A4A4A

Design tokens & code

CSS

--color: #283db0;
/* rgb */ color: rgb(40, 61, 176);
/* oklch */ color: oklch(42.4% 0.183 268.8);

Tailwind

colors: {
  custom: {
    50: '#7872c9',
    500: '#283db0',
    950: '#000000',
  },
}

SCSS

$custom: #283db0;
$custom-light: #7872c9;
$custom-dark: #000000;

JSON

{
  "hex": "#283db0",
  "rgb": {
    "r": 40,
    "g": 61,
    "b": 176
  },
  "hsl": {
    "h": 230.735,
    "s": 62.963,
    "l": 42.353
  },
  "oklch": {
    "l": 0.42391,
    "c": 0.18319,
    "h": 268.8
  },
  "luminance": 0.06923
}

Semantic roles & 50–950 ramp

primary

#283DB0

secondary

#C6B96D

accent

#CD42E6

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #283DB0

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

Preview Lab → · Contrast checker → · Palette generator →