#283C8B#283C8B

#283C8B is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.9% C 0.134 H 268.7°. Best body text is #FFFFFF at 9.96:1 contrast (WCAG AA passes).

Color values

HEX	#283C8B
RGB	rgb(40, 60, 139)
HSL	hsl(228, 55%, 35%)
HSV	hsv(228, 71%, 55%)
CMYK	cmyk(71.2%, 56.8%, 0%, 45.5%)
CIE-LAB	lab(28.24, 20.39, -46.38)
CIE-LCH	lch(28.24, 50.67, 293.73°)
OKLab	oklab(38.9% -0.0031 -0.1335)
OKLCH	oklch(38.9% 0.134 268.7)
XYZ	xyz(7.1495, 5.5462, 25.1148)
Luminance	0.0555 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283C8B #8B7728

analogous

#286D8B #283C8B #46288B

triadic

#283C8B #8B283C #3C8B28

tetradic

#283C8B #8B286D #8B7728 #288B46

square

#283C8B #8B286D #8B7728 #288B46

split-complementary

#283C8B #8B4628 #6D8B28

monochromatic

#0D132C #1A275B #283C8B #3651BB #5D74D0

Accessibility & contrast

On white

9.96

#283C8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.11

#283C8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283C8B

9.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283C8B	#FFFFFF	#000000	##FFFFFF
##283C8B	1.00	9.96	2.11	9.96
#FFFFFF	9.96	1.00	21.00	1.00
#000000	2.11	21.00	1.00	21.00
##FFFFFF	9.96	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478E

Deuteranopia (green-blind)

#003E89

Tritanopia (blue-blind)

#004F5D

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #283c8b;
/* rgb */ color: rgb(40, 60, 139);
/* oklch */ color: oklch(38.9% 0.134 268.7);

Tailwind

colors: {
  custom: {
    50: '#6f71ad',
    500: '#283c8b',
    950: '#000000',
  },
}

SCSS

$custom: #283c8b;
$custom-light: #6f71ad;
$custom-dark: #000000;

JSON

{
  "hex": "#283c8b",
  "rgb": {
    "r": 40,
    "g": 60,
    "b": 139
  },
  "hsl": {
    "h": 227.879,
    "s": 55.307,
    "l": 35.098
  },
  "oklch": {
    "l": 0.38902,
    "c": 0.13356,
    "h": 268.7
  },
  "luminance": 0.05547
}

Semantic roles & 50–950 ramp

primary

#283C8B

secondary

#B6A359

accent

#C049DF

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283C8B

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

Preview Lab → · Contrast checker → · Palette generator →