#283F9F#283F9F

#283F9F is a dark, vivid blue. Relative luminance 0.065; OKLCH L 41.2% C 0.158 H 268.2°. Best body text is #FFFFFF at 9.12:1 contrast (WCAG AA passes).

Color values

HEX	#283F9F
RGB	rgb(40, 63, 159)
HSL	hsl(228, 60%, 39%)
HSV	hsv(228, 75%, 62%)
CMYK	cmyk(74.8%, 60.4%, 0%, 37.6%)
CIE-LAB	lab(30.66, 26.00, -54.68)
CIE-LCH	lch(30.66, 60.54, 295.43°)
OKLab	oklab(41.22% -0.0048 -0.1578)
OKLCH	oklch(41.22% 0.158 268.2)
XYZ	xyz(8.9084, 6.5084, 33.5809)
Luminance	0.0651 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F9F #9F8828

analogous

#287B9F #283F9F #4D289F

triadic

#283F9F #9F283F #3F9F28

tetradic

#283F9F #9F287B #9F8828 #289F4D

square

#283F9F #9F287B #9F8828 #289F4D

split-complementary

#283F9F #9F4D28 #7B9F28

monochromatic

#0F183D #1C2C6E #283F9F #3754CD #687ED9

Accessibility & contrast

On white

9.12

#283F9F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.30

#283F9F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F9F

9.12:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F9F	#FFFFFF	#000000	##FFFFFF
##283F9F	1.00	9.12	2.30	9.12
#FFFFFF	9.12	1.00	21.00	1.00
#000000	2.30	21.00	1.00	21.00
##FFFFFF	9.12	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EA2

Deuteranopia (green-blind)

#00439D

Tritanopia (blue-blind)

#005768

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #283f9f;
/* rgb */ color: rgb(40, 63, 159);
/* oklch */ color: oklch(41.2% 0.158 268.2);

Tailwind

colors: {
  custom: {
    50: '#7473bc',
    500: '#283f9f',
    950: '#000000',
  },
}

SCSS

$custom: #283f9f;
$custom-light: #7473bc;
$custom-dark: #000000;

JSON

{
  "hex": "#283f9f",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 159
  },
  "hsl": {
    "h": 228.403,
    "s": 59.799,
    "l": 39.02
  },
  "oklch": {
    "l": 0.41219,
    "c": 0.15792,
    "h": 268.2
  },
  "luminance": 0.06509
}

Semantic roles & 50–950 ramp

primary

#283F9F

secondary

#BFAE64

accent

#C445E3

background

#F7F7FB

surface

#EEEDF6

border

#C9C8D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #283F9F

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

Preview Lab → · Contrast checker → · Palette generator →