#283399#283399

#283399 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 38.4% C 0.165 H 271.3°. Best body text is #FFFFFF at 10.38:1 contrast (WCAG AA passes).

Color values

HEX	#283399
RGB	rgb(40, 51, 153)
HSL	hsl(234, 59%, 38%)
HSV	hsv(234, 74%, 60%)
CMYK	cmyk(73.9%, 66.7%, 0%, 40%)
CIE-LAB	lab(27.07, 31.71, -56.90)
CIE-LCH	lch(27.07, 65.14, 299.13°)
OKLab	oklab(38.41% 0.0037 -0.1645)
OKLCH	oklch(38.41% 0.165 271.3)
XYZ	xyz(7.8067, 5.1179, 30.7072)
Luminance	0.0512 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283399 #998E28

analogous

#286C99 #283399 #552899

triadic

#283399 #992833 #339928

tetradic

#283399 #99286C #998E28 #289955

square

#283399 #99286C #998E28 #289955

split-complementary

#283399 #995528 #6C9928

monochromatic

#0F1338 #1B2368 #283399 #3543CA #6570D7

Accessibility & contrast

On white

10.38

#283399 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#283399 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283399

10.38:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283399	#FFFFFF	#000000	##FFFFFF
##283399	1.00	10.38	2.02	10.38
#FFFFFF	10.38	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.38	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00459C

Deuteranopia (green-blind)

#003B97

Tritanopia (blue-blind)

#004E61

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #283399;
/* rgb */ color: rgb(40, 51, 153);
/* oklch */ color: oklch(38.4% 0.165 271.3);

Tailwind

colors: {
  custom: {
    50: '#736bb8',
    500: '#283399',
    950: '#000000',
  },
}

SCSS

$custom: #283399;
$custom-light: #736bb8;
$custom-dark: #000000;

JSON

{
  "hex": "#283399",
  "rgb": {
    "r": 40,
    "g": 51,
    "b": 153
  },
  "hsl": {
    "h": 234.159,
    "s": 58.549,
    "l": 37.843
  },
  "oklch": {
    "l": 0.38406,
    "c": 0.16453,
    "h": 271.3
  },
  "luminance": 0.05119
}

Semantic roles & 50–950 ramp

primary

#283399

secondary

#BDB460

accent

#D346E2

background

#F7F6FB

surface

#EEEBF6

border

#C9C6D0

text

#090611

muted

#7B7A80

Preview Lab

Preview with #283399

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

Preview Lab → · Contrast checker → · Palette generator →