#283DB1#283DB1

#283DB1 is a dark, vivid blue. Relative luminance 0.070; OKLCH L 42.5% C 0.184 H 268.8°. Best body text is #FFFFFF at 8.78:1 contrast (WCAG AA passes).

Color values

HEX	#283DB1
RGB	rgb(40, 61, 177)
HSL	hsl(231, 63%, 43%)
HSV	hsv(231, 77%, 69%)
CMYK	cmyk(77.4%, 65.5%, 0%, 30.6%)
CIE-LAB	lab(31.72, 34.05, -63.75)
CIE-LCH	lch(31.72, 72.27, 298.11°)
OKLab	oklab(42.49% -0.004 -0.1845)
OKLCH	oklch(42.49% 0.185 268.8)
XYZ	xyz(10.4769, 6.9618, 42.3780)
Luminance	0.0696 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283DB1 #B19C28

analogous

#2881B1 #283DB1 #5828B1

triadic

#283DB1 #B1283D #3DB128

tetradic

#283DB1 #B12881 #B19C28 #28B158

square

#283DB1 #B12881 #B19C28 #28B158

split-complementary

#283DB1 #B15828 #81B128

monochromatic

#111B4D #1D2C7F #283DB1 #4258D4 #7484E0

Accessibility & contrast

On white

8.78

#283DB1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.39

#283DB1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283DB1

8.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283DB1	#FFFFFF	#000000	##FFFFFF
##283DB1	1.00	8.78	2.39	8.78
#FFFFFF	8.78	1.00	21.00	1.00
#000000	2.39	21.00	1.00	21.00
##FFFFFF	8.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051B5

Deuteranopia (green-blind)

#0044AF

Tritanopia (blue-blind)

#005C71

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #283db1;
/* rgb */ color: rgb(40, 61, 177);
/* oklch */ color: oklch(42.5% 0.184 268.8);

Tailwind

colors: {
  custom: {
    50: '#7872c9',
    500: '#283db1',
    950: '#000000',
  },
}

SCSS

$custom: #283db1;
$custom-light: #7872c9;
$custom-dark: #000000;

JSON

{
  "hex": "#283db1",
  "rgb": {
    "r": 40,
    "g": 61,
    "b": 177
  },
  "hsl": {
    "h": 230.803,
    "s": 63.134,
    "l": 42.549
  },
  "oklch": {
    "l": 0.42485,
    "c": 0.1845,
    "h": 268.8
  },
  "luminance": 0.06963
}

Semantic roles & 50–950 ramp

primary

#283DB1

secondary

#C7B96E

accent

#CD42E6

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #283DB1

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

Preview Lab → · Contrast checker → · Palette generator →