#283F9A#283F9A

#283F9A is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.8% C 0.151 H 268.1°. Best body text is #FFFFFF at 9.26:1 contrast (WCAG AA passes).

Color values

HEX	#283F9A
RGB	rgb(40, 63, 154)
HSL	hsl(228, 59%, 38%)
HSV	hsv(228, 74%, 60%)
CMYK	cmyk(74%, 59.1%, 0%, 39.6%)
CIE-LAB	lab(30.25, 24.09, -52.31)
CIE-LCH	lch(30.25, 57.59, 294.73°)
OKLab	oklab(40.78% -0.0049 -0.1509)
OKLCH	oklch(40.78% 0.151 268.1)
XYZ	xyz(8.4833, 6.3383, 31.3419)
Luminance	0.0634 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F9A #9A8328

analogous

#28789A #283F9A #4A289A

triadic

#283F9A #9A283F #3F9A28

tetradic

#283F9A #9A2878 #9A8328 #289A4A

square

#283F9A #9A2878 #9A8328 #289A4A

split-complementary

#283F9A #9A4A28 #789A28

monochromatic

#0F1739 #1B2B69 #283F9A #3553CA #657CD7

Accessibility & contrast

On white

9.26

#283F9A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.27

#283F9A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F9A

9.26:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F9A	#FFFFFF	#000000	##FFFFFF
##283F9A	1.00	9.26	2.27	9.26
#FFFFFF	9.26	1.00	21.00	1.00
#000000	2.27	21.00	1.00	21.00
##FFFFFF	9.26	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004D9D

Deuteranopia (green-blind)

#004298

Tritanopia (blue-blind)

#005666

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #283f9a;
/* rgb */ color: rgb(40, 63, 154);
/* oklch */ color: oklch(40.8% 0.151 268.1);

Tailwind

colors: {
  custom: {
    50: '#7373b9',
    500: '#283f9a',
    950: '#000000',
  },
}

SCSS

$custom: #283f9a;
$custom-light: #7373b9;
$custom-dark: #000000;

JSON

{
  "hex": "#283f9a",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 154
  },
  "hsl": {
    "h": 227.895,
    "s": 58.763,
    "l": 38.039
  },
  "oklch": {
    "l": 0.40785,
    "c": 0.15098,
    "h": 268.1
  },
  "luminance": 0.06339
}

Semantic roles & 50–950 ramp

primary

#283F9A

secondary

#BDAA61

accent

#C246E2

background

#F7F7FB

surface

#EDEDF6

border

#C8C8D0

text

#090811

muted

#7B7B80

Preview Lab

Preview with #283F9A

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

Preview Lab → · Contrast checker → · Palette generator →