#283F91#283F91

#283F91 is a dark, vivid blue. Relative luminance 0.060; OKLCH L 40.0% C 0.138 H 267.8°. Best body text is #FFFFFF at 9.50:1 contrast (WCAG AA passes).

Color values

HEX	#283F91
RGB	rgb(40, 63, 145)
HSL	hsl(227, 57%, 36%)
HSV	hsv(227, 72%, 57%)
CMYK	cmyk(72.4%, 56.6%, 0%, 43.1%)
CIE-LAB	lab(29.54, 20.64, -47.97)
CIE-LCH	lch(29.54, 52.22, 293.28°)
OKLab	oklab(40.03% -0.0053 -0.1381)
OKLCH	oklch(40.03% 0.138 267.8)
XYZ	xyz(7.7616, 6.0497, 27.5412)
Luminance	0.0605 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F91 #917A28

analogous

#287491 #283F91 #462891

triadic

#283F91 #91283F #3F9128

tetradic

#283F91 #912874 #917A28 #289146

square

#283F91 #912874 #917A28 #289146

split-complementary

#283F91 #914628 #749128

monochromatic

#0E1531 #1B2A61 #283F91 #3554C1 #6079D3

Accessibility & contrast

On white

9.50

#283F91 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.21

#283F91 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F91

9.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F91	#FFFFFF	#000000	##FFFFFF
##283F91	1.00	9.50	2.21	9.50
#FFFFFF	9.50	1.00	21.00	1.00
#000000	2.21	21.00	1.00	21.00
##FFFFFF	9.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004B94

Deuteranopia (green-blind)

#00418F

Tritanopia (blue-blind)

#005361

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #283f91;
/* rgb */ color: rgb(40, 63, 145);
/* oklch */ color: oklch(40.0% 0.138 267.8);

Tailwind

colors: {
  custom: {
    50: '#7073b2',
    500: '#283f91',
    950: '#000000',
  },
}

SCSS

$custom: #283f91;
$custom-light: #7073b2;
$custom-dark: #000000;

JSON

{
  "hex": "#283f91",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 145
  },
  "hsl": {
    "h": 226.857,
    "s": 56.757,
    "l": 36.275
  },
  "oklch": {
    "l": 0.40026,
    "c": 0.13825,
    "h": 267.8
  },
  "luminance": 0.0605
}

Semantic roles & 50–950 ramp

primary

#283F91

secondary

#B9A45C

accent

#BF48E0

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090811

muted

#7B7B80

Preview Lab

Preview with #283F91

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

Preview Lab → · Contrast checker → · Palette generator →