#283FAB#283FAB

#283FAB is a dark, vivid blue. Relative luminance 0.069; OKLCH L 42.3% C 0.174 H 268.4°. Best body text is #FFFFFF at 8.79:1 contrast (WCAG AA passes).

Color values

HEX	#283FAB
RGB	rgb(40, 63, 171)
HSL	hsl(229, 62%, 41%)
HSV	hsv(229, 77%, 67%)
CMYK	cmyk(76.6%, 63.2%, 0%, 32.9%)
CIE-LAB	lab(31.68, 30.52, -60.23)
CIE-LCH	lch(31.68, 67.52, 296.87°)
OKLab	oklab(42.29% -0.0049 -0.1741)
OKLCH	oklch(42.29% 0.174 268.4)
XYZ	xyz(10.0007, 6.9453, 39.3337)
Luminance	0.0695 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283FAB #AB9428

analogous

#2881AB #283FAB #5328AB

triadic

#283FAB #AB283F #3FAB28

tetradic

#283FAB #AB2881 #AB9428 #28AB53

square

#283FAB #AB2881 #AB9428 #28AB53

split-complementary

#283FAB #AB5328 #81AB28

monochromatic

#111A48 #1C2D79 #283FAB #3E58D2 #7083DE

Accessibility & contrast

On white

8.79

#283FAB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.39

#283FAB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283FAB

8.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283FAB	#FFFFFF	#000000	##FFFFFF
##283FAB	1.00	8.79	2.39	8.79
#FFFFFF	8.79	1.00	21.00	1.00
#000000	2.39	21.00	1.00	21.00
##FFFFFF	8.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0051AE

Deuteranopia (green-blind)

#0045A9

Tritanopia (blue-blind)

#005B6F

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #283fab;
/* rgb */ color: rgb(40, 63, 171);
/* oklch */ color: oklch(42.3% 0.174 268.4);

Tailwind

colors: {
  custom: {
    50: '#7774c5',
    500: '#283fab',
    950: '#000000',
  },
}

SCSS

$custom: #283fab;
$custom-light: #7774c5;
$custom-dark: #000000;

JSON

{
  "hex": "#283fab",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 171
  },
  "hsl": {
    "h": 229.466,
    "s": 62.085,
    "l": 41.373
  },
  "oklch": {
    "l": 0.42293,
    "c": 0.17421,
    "h": 268.4
  },
  "luminance": 0.06946
}

Semantic roles & 50–950 ramp

primary

#283FAB

secondary

#C4B56A

accent

#C943E5

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #283FAB

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

Preview Lab → · Contrast checker → · Palette generator →