#283F99#283F99

#283F99 is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.7% C 0.150 H 268.1°. Best body text is #FFFFFF at 9.29:1 contrast (WCAG AA passes).

Color values

HEX	#283F99
RGB	rgb(40, 63, 153)
HSL	hsl(228, 59%, 38%)
HSV	hsv(228, 74%, 60%)
CMYK	cmyk(73.9%, 58.8%, 0%, 40%)
CIE-LAB	lab(30.17, 23.71, -51.83)
CIE-LCH	lch(30.17, 57.00, 294.58°)
OKLab	oklab(40.7% -0.005 -0.1495)
OKLCH	oklch(40.7% 0.15 268.1)
XYZ	xyz(8.4004, 6.3052, 30.9051)
Luminance	0.0631 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F99 #998228

analogous

#287799 #283F99 #4A2899

triadic

#283F99 #99283F #3F9928

tetradic

#283F99 #992877 #998228 #28994A

square

#283F99 #992877 #998228 #28994A

split-complementary

#283F99 #994A28 #779928

monochromatic

#0F1738 #1B2B68 #283F99 #3553CA #657CD7

Accessibility & contrast

On white

9.29

#283F99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#283F99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F99

9.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F99	#FFFFFF	#000000	##FFFFFF
##283F99	1.00	9.29	2.26	9.29
#FFFFFF	9.29	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004C9C

Deuteranopia (green-blind)

#004297

Tritanopia (blue-blind)

#005565

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #283f99;
/* rgb */ color: rgb(40, 63, 153);
/* oklch */ color: oklch(40.7% 0.150 268.1);

Tailwind

colors: {
  custom: {
    50: '#7273b8',
    500: '#283f99',
    950: '#000000',
  },
}

SCSS

$custom: #283f99;
$custom-light: #7273b8;
$custom-dark: #000000;

JSON

{
  "hex": "#283f99",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 153
  },
  "hsl": {
    "h": 227.788,
    "s": 58.549,
    "l": 37.843
  },
  "oklch": {
    "l": 0.40699,
    "c": 0.14958,
    "h": 268.1
  },
  "luminance": 0.06306
}

Semantic roles & 50–950 ramp

primary

#283F99

secondary

#BDAA60

accent

#C246E2

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090811

muted

#7B7B80

Preview Lab

Preview with #283F99

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

Preview Lab → · Contrast checker → · Palette generator →