#28309B#28309B

#28309B is a dark, vivid blue. Relative luminance 0.049; OKLCH L 38.1% C 0.171 H 271.8°. Best body text is #FFFFFF at 10.57:1 contrast (WCAG AA passes).

Color values

HEX	#28309B
RGB	rgb(40, 48, 155)
HSL	hsl(236, 59%, 38%)
HSV	hsv(236, 74%, 61%)
CMYK	cmyk(74.2%, 69%, 0%, 39.2%)
CIE-LAB	lab(26.54, 34.36, -59.00)
CIE-LCH	lch(26.54, 68.27, 300.22°)
OKLab	oklab(38.08% 0.0055 -0.1706)
OKLCH	oklch(38.08% 0.171 271.8)
XYZ	xyz(7.8464, 4.9308, 31.5422)
Luminance	0.0493 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#28309B #9B9328

analogous

#28699B #28309B #59289B

triadic

#28309B #9B2830 #309B28

tetradic

#28309B #9B2869 #9B9328 #289B59

square

#28309B #9B2869 #9B9328 #289B59

split-complementary

#28309B #9B5928 #699B28

monochromatic

#0F123A #1B216A #28309B #3540CB #666ED7

Accessibility & contrast

On white

10.57

#28309B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.99

#28309B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #28309B

10.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##28309B	#FFFFFF	#000000	##FFFFFF
##28309B	1.00	10.57	1.99	10.57
#FFFFFF	10.57	1.00	21.00	1.00
#000000	1.99	21.00	1.00	21.00
##FFFFFF	10.57	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00449E

Deuteranopia (green-blind)

#003999

Tritanopia (blue-blind)

#004D61

Achromatopsia (no color)

#3F3F3F

Design tokens & code

CSS

--color: #28309b;
/* rgb */ color: rgb(40, 48, 155);
/* oklch */ color: oklch(38.1% 0.171 271.8);

Tailwind

colors: {
  custom: {
    50: '#7469ba',
    500: '#28309b',
    950: '#000000',
  },
}

SCSS

$custom: #28309b;
$custom-light: #7469ba;
$custom-dark: #000000;

JSON

{
  "hex": "#28309b",
  "rgb": {
    "r": 40,
    "g": 48,
    "b": 155
  },
  "hsl": {
    "h": 235.826,
    "s": 58.974,
    "l": 38.235
  },
  "oklch": {
    "l": 0.38077,
    "c": 0.17071,
    "h": 271.8
  },
  "luminance": 0.04932
}

Semantic roles & 50–950 ramp

primary

#28309B

secondary

#BDB761

accent

#D746E2

background

#F7F6FB

surface

#EEEBF6

border

#C9C6D0

text

#090612

muted

#7B7A81

Preview Lab

Preview with #28309B

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

Preview Lab → · Contrast checker → · Palette generator →