#283F9E#283F9E

#283F9E is a dark, vivid blue. Relative luminance 0.065; OKLCH L 41.1% C 0.157 H 268.2°. Best body text is #FFFFFF at 9.15:1 contrast (WCAG AA passes).

Color values

HEX	#283F9E
RGB	rgb(40, 63, 158)
HSL	hsl(228, 60%, 39%)
HSV	hsv(228, 75%, 62%)
CMYK	cmyk(74.7%, 60.1%, 0%, 38%)
CIE-LAB	lab(30.58, 25.62, -54.21)
CIE-LCH	lch(30.58, 59.96, 295.30°)
OKLab	oklab(41.13% -0.0048 -0.1565)
OKLCH	oklch(41.13% 0.157 268.2)
XYZ	xyz(8.8220, 6.4738, 33.1258)
Luminance	0.0648 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F9E #9E8728

analogous

#287A9E #283F9E #4C289E

triadic

#283F9E #9E283F #3F9E28

tetradic

#283F9E #9E287A #9E8728 #289E4C

square

#283F9E #9E287A #9E8728 #289E4C

split-complementary

#283F9E #9E4C28 #7A9E28

monochromatic

#0F183C #1C2C6D #283F9E #3754CC #687ED9

Accessibility & contrast

On white

9.15

#283F9E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.30

#283F9E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F9E

9.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F9E	#FFFFFF	#000000	##FFFFFF
##283F9E	1.00	9.15	2.30	9.15
#FFFFFF	9.15	1.00	21.00	1.00
#000000	2.30	21.00	1.00	21.00
##FFFFFF	9.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EA1

Deuteranopia (green-blind)

#00439C

Tritanopia (blue-blind)

#005768

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #283f9e;
/* rgb */ color: rgb(40, 63, 158);
/* oklch */ color: oklch(41.1% 0.157 268.2);

Tailwind

colors: {
  custom: {
    50: '#7473bb',
    500: '#283f9e',
    950: '#000000',
  },
}

SCSS

$custom: #283f9e;
$custom-light: #7473bb;
$custom-dark: #000000;

JSON

{
  "hex": "#283f9e",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 158
  },
  "hsl": {
    "h": 228.305,
    "s": 59.596,
    "l": 38.824
  },
  "oklch": {
    "l": 0.41131,
    "c": 0.15655,
    "h": 268.2
  },
  "luminance": 0.06475
}

Semantic roles & 50–950 ramp

primary

#283F9E

secondary

#BFAD63

accent

#C445E3

background

#F7F7FB

surface

#EEEDF6

border

#C9C8D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #283F9E

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

Preview Lab → · Contrast checker → · Palette generator →