#283D8F#283D8F

#283D8F is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.4% C 0.138 H 268.5°. Best body text is #FFFFFF at 9.75:1 contrast (WCAG AA passes).

Color values

HEX	#283D8F
RGB	rgb(40, 61, 143)
HSL	hsl(228, 56%, 36%)
HSV	hsv(228, 72%, 56%)
CMYK	cmyk(72%, 57.3%, 0%, 43.9%)
CIE-LAB	lab(28.83, 21.24, -47.90)
CIE-LCH	lch(28.83, 52.39, 293.91°)
OKLab	oklab(39.44% -0.0037 -0.1379)
OKLCH	oklch(39.44% 0.138 268.5)
XYZ	xyz(7.5000, 5.7710, 26.6999)
Luminance	0.0577 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283D8F #8F7A28

analogous

#28708F #283D8F #46288F

triadic

#283D8F #8F283D #3D8F28

tetradic

#283D8F #8F2870 #8F7A28 #288F46

square

#283D8F #8F2870 #8F7A28 #288F46

split-complementary

#283D8F #8F4628 #708F28

monochromatic

#0D142F #1B295F #283D8F #3551BF #5F77D2

Accessibility & contrast

On white

9.75

#283D8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.15

#283D8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283D8F

9.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283D8F	#FFFFFF	#000000	##FFFFFF
##283D8F	1.00	9.75	2.15	9.75
#FFFFFF	9.75	1.00	21.00	1.00
#000000	2.15	21.00	1.00	21.00
##FFFFFF	9.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004992

Deuteranopia (green-blind)

#003F8D

Tritanopia (blue-blind)

#005160

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #283d8f;
/* rgb */ color: rgb(40, 61, 143);
/* oklch */ color: oklch(39.4% 0.138 268.5);

Tailwind

colors: {
  custom: {
    50: '#7072b0',
    500: '#283d8f',
    950: '#000000',
  },
}

SCSS

$custom: #283d8f;
$custom-light: #7072b0;
$custom-dark: #000000;

JSON

{
  "hex": "#283d8f",
  "rgb": {
    "r": 40,
    "g": 61,
    "b": 143
  },
  "hsl": {
    "h": 227.767,
    "s": 56.284,
    "l": 35.882
  },
  "oklch": {
    "l": 0.39443,
    "c": 0.138,
    "h": 268.5
  },
  "luminance": 0.05772
}

Semantic roles & 50–950 ramp

primary

#283D8F

secondary

#B8A55B

accent

#C148E0

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080711

muted

#7B7A80

Preview Lab

Preview with #283D8F

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

Preview Lab → · Contrast checker → · Palette generator →