#283B91#283B91

#283B91 is a dark, vivid blue. Relative luminance 0.056; OKLCH L 39.2% C 0.143 H 269.2°. Best body text is #FFFFFF at 9.88:1 contrast (WCAG AA passes).

Color values

HEX	#283B91
RGB	rgb(40, 59, 145)
HSL	hsl(229, 57%, 36%)
HSV	hsv(229, 72%, 57%)
CMYK	cmyk(72.4%, 59.3%, 0%, 43.1%)
CIE-LAB	lab(28.44, 23.37, -49.76)
CIE-LCH	lch(28.44, 54.97, 295.16°)
OKLab	oklab(39.2% -0.002 -0.1434)
OKLCH	oklch(39.2% 0.143 269.2)
XYZ	xyz(7.5481, 5.6226, 27.4701)
Luminance	0.0562 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B91 #917E28

analogous

#287091 #283B91 #4A2891

triadic

#283B91 #91283B #3B9128

tetradic

#283B91 #912870 #917E28 #28914A

square

#283B91 #912870 #917E28 #28914A

split-complementary

#283B91 #914A28 #709128

monochromatic

#0E1431 #1B2761 #283B91 #354FC1 #6075D3

Accessibility & contrast

On white

9.88

#283B91 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#283B91 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B91

9.88:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B91	#FFFFFF	#000000	##FFFFFF
##283B91	1.00	9.88	2.12	9.88
#FFFFFF	9.88	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.88	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004894

Deuteranopia (green-blind)

#003E8F

Tritanopia (blue-blind)

#005060

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #283b91;
/* rgb */ color: rgb(40, 59, 145);
/* oklch */ color: oklch(39.2% 0.143 269.2);

Tailwind

colors: {
  custom: {
    50: '#7170b2',
    500: '#283b91',
    950: '#000000',
  },
}

SCSS

$custom: #283b91;
$custom-light: #7170b2;
$custom-dark: #000000;

JSON

{
  "hex": "#283b91",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 145
  },
  "hsl": {
    "h": 229.143,
    "s": 56.757,
    "l": 36.275
  },
  "oklch": {
    "l": 0.39203,
    "c": 0.14346,
    "h": 269.2
  },
  "luminance": 0.05623
}

Semantic roles & 50–950 ramp

primary

#283B91

secondary

#B9A85C

accent

#C448E0

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090711

muted

#7B7A80

Preview Lab

Preview with #283B91

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

Preview Lab → · Contrast checker → · Palette generator →