#28399B#28399B

#28399B is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.7% C 0.160 H 269.8°. Best body text is #FFFFFF at 9.77:1 contrast (WCAG AA passes).

Color values

HEX	#28399B
RGB	rgb(40, 57, 155)
HSL	hsl(231, 59%, 38%)
HSV	hsv(231, 74%, 61%)
CMYK	cmyk(74.2%, 63.2%, 0%, 39.2%)
CIE-LAB	lab(28.75, 28.50, -55.36)
CIE-LCH	lch(28.75, 62.26, 297.24°)
OKLab	oklab(39.7% -0.0005 -0.1599)
OKLCH	oklch(39.7% 0.16 269.8)
XYZ	xyz(8.2526, 5.7431, 31.6776)
Luminance	0.0574 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#28399B #9B8A28

analogous

#28729B #28399B #50289B

triadic

#28399B #9B2839 #399B28

tetradic

#28399B #9B2872 #9B8A28 #289B50

square

#28399B #9B2872 #9B8A28 #289B50

split-complementary

#28399B #9B5028 #729B28

monochromatic

#0F153A #1B276A #28399B #354BCB #6677D7

Accessibility & contrast

On white

9.77

#28399B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.15

#28399B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #28399B

9.77:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##28399B	#FFFFFF	#000000	##FFFFFF
##28399B	1.00	9.77	2.15	9.77
#FFFFFF	9.77	1.00	21.00	1.00
#000000	2.15	21.00	1.00	21.00
##FFFFFF	9.77	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00499E

Deuteranopia (green-blind)

#003F99

Tritanopia (blue-blind)

#005264

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #28399b;
/* rgb */ color: rgb(40, 57, 155);
/* oklch */ color: oklch(39.7% 0.160 269.8);

Tailwind

colors: {
  custom: {
    50: '#736fb9',
    500: '#28399b',
    950: '#000000',
  },
}

SCSS

$custom: #28399b;
$custom-light: #736fb9;
$custom-dark: #000000;

JSON

{
  "hex": "#28399b",
  "rgb": {
    "r": 40,
    "g": 57,
    "b": 155
  },
  "hsl": {
    "h": 231.13,
    "s": 58.974,
    "l": 38.235
  },
  "oklch": {
    "l": 0.397,
    "c": 0.15992,
    "h": 269.8
  },
  "luminance": 0.05744
}

Semantic roles & 50–950 ramp

primary

#28399B

secondary

#BDB061

accent

#CB46E2

background

#F7F6FB

surface

#EEECF6

border

#C9C7D0

text

#090712

muted

#7B7A81

Preview Lab

Preview with #28399B

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

Preview Lab → · Contrast checker → · Palette generator →