#28378B#28378B

#28378B is a dark, vivid blue. Relative luminance 0.050; OKLCH L 37.9% C 0.140 H 270.5°. Best body text is #FFFFFF at 10.45:1 contrast (WCAG AA passes).

Color values

HEX	#28378B
RGB	rgb(40, 55, 139)
HSL	hsl(231, 55%, 35%)
HSV	hsv(231, 71%, 55%)
CMYK	cmyk(71.2%, 60.4%, 0%, 45.5%)
CIE-LAB	lab(26.87, 23.80, -48.61)
CIE-LCH	lch(26.87, 54.12, 296.09°)
OKLab	oklab(37.88% 0.0012 -0.1401)
OKLCH	oklch(37.88% 0.14 270.5)
XYZ	xyz(6.8999, 5.0469, 25.0316)
Luminance	0.0505 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#28378B #8B7C28

analogous

#28688B #28378B #4A288B

triadic

#28378B #8B2837 #378B28

tetradic

#28378B #8B2868 #8B7C28 #288B4A

square

#28378B #8B2868 #8B7C28 #288B4A

split-complementary

#28378B #8B4A28 #688B28

monochromatic

#0D112C #1A245B #28378B #364ABB #5D6ED0

Accessibility & contrast

On white

10.45

#28378B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.01

#28378B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #28378B

10.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##28378B	#FFFFFF	#000000	##FFFFFF
##28378B	1.00	10.45	2.01	10.45
#FFFFFF	10.45	1.00	21.00	1.00
#000000	2.01	21.00	1.00	21.00
##FFFFFF	10.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00448E

Deuteranopia (green-blind)

#003B89

Tritanopia (blue-blind)

#004C5B

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #28378b;
/* rgb */ color: rgb(40, 55, 139);
/* oklch */ color: oklch(37.9% 0.140 270.5);

Tailwind

colors: {
  custom: {
    50: '#706dae',
    500: '#28378b',
    950: '#000000',
  },
}

SCSS

$custom: #28378b;
$custom-light: #706dae;
$custom-dark: #000000;

JSON

{
  "hex": "#28378b",
  "rgb": {
    "r": 40,
    "g": 55,
    "b": 139
  },
  "hsl": {
    "h": 230.909,
    "s": 55.307,
    "l": 35.098
  },
  "oklch": {
    "l": 0.37878,
    "c": 0.14014,
    "h": 270.5
  },
  "luminance": 0.05048
}

Semantic roles & 50–950 ramp

primary

#28378B

secondary

#B6A859

accent

#C849DF

background

#F7F6FA

surface

#EDEBF4

border

#C8C6CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #28378B

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

Preview Lab → · Contrast checker → · Palette generator →