#283B8B#283B8B

#283B8B is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.7% C 0.135 H 269.1°. Best body text is #FFFFFF at 10.05:1 contrast (WCAG AA passes).

Color values

HEX	#283B8B
RGB	rgb(40, 59, 139)
HSL	hsl(228, 55%, 35%)
HSV	hsv(228, 71%, 55%)
CMYK	cmyk(71.2%, 57.6%, 0%, 45.5%)
CIE-LAB	lab(27.96, 21.07, -46.83)
CIE-LCH	lch(27.96, 51.36, 294.22°)
OKLab	oklab(38.69% -0.0022 -0.1349)
OKLCH	oklch(38.69% 0.135 269.1)
XYZ	xyz(7.0976, 5.4424, 25.0975)
Luminance	0.0544 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#283B8B #8B7828

analogous

#286C8B #283B8B #47288B

triadic

#283B8B #8B283B #3B8B28

tetradic

#283B8B #8B286C #8B7828 #288B47

square

#283B8B #8B286C #8B7828 #288B47

split-complementary

#283B8B #8B4728 #6C8B28

monochromatic

#0D132C #1A275B #283B8B #364FBB #5D73D0

Accessibility & contrast

On white

10.05

#283B8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#283B8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #283B8B

10.05:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##283B8B	#FFFFFF	#000000	##FFFFFF
##283B8B	1.00	10.05	2.09	10.05
#FFFFFF	10.05	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.05	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478E

Deuteranopia (green-blind)

#003E89

Tritanopia (blue-blind)

#004E5D

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #283b8b;
/* rgb */ color: rgb(40, 59, 139);
/* oklch */ color: oklch(38.7% 0.135 269.1);

Tailwind

colors: {
  custom: {
    50: '#6f70ae',
    500: '#283b8b',
    950: '#000000',
  },
}

SCSS

$custom: #283b8b;
$custom-light: #6f70ae;
$custom-dark: #000000;

JSON

{
  "hex": "#283b8b",
  "rgb": {
    "r": 40,
    "g": 59,
    "b": 139
  },
  "hsl": {
    "h": 228.485,
    "s": 55.307,
    "l": 35.098
  },
  "oklch": {
    "l": 0.38694,
    "c": 0.13488,
    "h": 269.1
  },
  "luminance": 0.05443
}

Semantic roles & 50–950 ramp

primary

#283B8B

secondary

#B6A459

accent

#C249DF

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #283B8B

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

Preview Lab → · Contrast checker → · Palette generator →