#283F8F#283F8F

#283F8F is a dark, vivid blue. Relative luminance 0.060; OKLCH L 39.9% C 0.135 H 267.7°. Best body text is #FFFFFF at 9.56:1 contrast (WCAG AA passes).

Color values

HEX	#283F8F
RGB	rgb(40, 63, 143)
HSL	hsl(227, 56%, 36%)
HSV	hsv(227, 72%, 56%)
CMYK	cmyk(72%, 55.9%, 0%, 43.9%)
CIE-LAB	lab(29.38, 19.87, -46.99)
CIE-LCH	lch(29.38, 51.02, 292.92°)
OKLab	oklab(39.86% -0.0054 -0.1353)
OKLCH	oklch(39.86% 0.135 267.7)
XYZ	xyz(7.6088, 5.9885, 26.7362)
Luminance	0.0599 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283F8F #8F7828

analogous

#28728F #283F8F #44288F

triadic

#283F8F #8F283F #3F8F28

tetradic

#283F8F #8F2872 #8F7828 #288F44

square

#283F8F #8F2872 #8F7828 #288F44

split-complementary

#283F8F #8F4428 #728F28

monochromatic

#0D152F #1B2A5F #283F8F #3554BF #5F79D2

Accessibility & contrast

On white

9.56

#283F8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.20

#283F8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283F8F

9.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283F8F	#FFFFFF	#000000	##FFFFFF
##283F8F	1.00	9.56	2.20	9.56
#FFFFFF	9.56	1.00	21.00	1.00
#000000	2.20	21.00	1.00	21.00
##FFFFFF	9.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004A92

Deuteranopia (green-blind)

#00418D

Tritanopia (blue-blind)

#005260

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #283f8f;
/* rgb */ color: rgb(40, 63, 143);
/* oklch */ color: oklch(39.9% 0.135 267.7);

Tailwind

colors: {
  custom: {
    50: '#7073b0',
    500: '#283f8f',
    950: '#000000',
  },
}

SCSS

$custom: #283f8f;
$custom-light: #7073b0;
$custom-dark: #000000;

JSON

{
  "hex": "#283f8f",
  "rgb": {
    "r": 40,
    "g": 63,
    "b": 143
  },
  "hsl": {
    "h": 226.602,
    "s": 56.284,
    "l": 35.882
  },
  "oklch": {
    "l": 0.39861,
    "c": 0.13538,
    "h": 267.7
  },
  "luminance": 0.05989
}

Semantic roles & 50–950 ramp

primary

#283F8F

secondary

#B8A35B

accent

#BE48E0

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080811

muted

#7B7B80

Preview Lab

Preview with #283F8F

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

Preview Lab → · Contrast checker → · Palette generator →