#303B8A#303B8A

#303B8A is a dark, vivid blue. Relative luminance 0.056; OKLCH L 39.1% C 0.131 H 272.8°. Best body text is #FFFFFF at 9.91:1 contrast (WCAG AA passes).

Color values

HEX	#303B8A
RGB	rgb(48, 59, 138)
HSL	hsl(233, 48%, 36%)
HSV	hsv(233, 65%, 54%)
CMYK	cmyk(65.2%, 57.2%, 0%, 45.9%)
CIE-LAB	lab(28.36, 22.01, -45.55)
CIE-LCH	lch(28.36, 50.59, 295.79°)
OKLab	oklab(39.09% 0.0064 -0.1309)
OKLCH	oklch(39.09% 0.131 272.8)
XYZ	xyz(7.3688, 5.5907, 24.7306)
Luminance	0.0559 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303B8A #8A7F30

analogous

#30688A #303B8A #52308A

triadic

#303B8A #8A303B #3B8A30

tetradic

#303B8A #8A3068 #8A7F30 #308A52

square

#303B8A #8A3068 #8A7F30 #308A52

split-complementary

#303B8A #8A5230 #688A30

monochromatic

#10142F #20285D #303B8A #404EB7 #6975CB

Accessibility & contrast

On white

9.91

#303B8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.12

#303B8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303B8A

9.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303B8A	#FFFFFF	#000000	##FFFFFF
##303B8A	1.00	9.91	2.12	9.91
#FFFFFF	9.91	1.00	21.00	1.00
#000000	2.12	21.00	1.00	21.00
##FFFFFF	9.91	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478D

Deuteranopia (green-blind)

#003F88

Tritanopia (blue-blind)

#004E5C

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #303b8a;
/* rgb */ color: rgb(48, 59, 138);
/* oklch */ color: oklch(39.1% 0.131 272.8);

Tailwind

colors: {
  custom: {
    50: '#7370ad',
    500: '#303b8a',
    950: '#000000',
  },
}

SCSS

$custom: #303b8a;
$custom-light: #7370ad;
$custom-dark: #000000;

JSON

{
  "hex": "#303b8a",
  "rgb": {
    "r": 48,
    "g": 59,
    "b": 138
  },
  "hsl": {
    "h": 232.667,
    "s": 48.387,
    "l": 36.471
  },
  "oklch": {
    "l": 0.39092,
    "c": 0.13105,
    "h": 272.8
  },
  "luminance": 0.05591
}

Semantic roles & 50–950 ramp

primary

#303B8A

secondary

#B2A964

accent

#C750D8

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#090710

muted

#7B7A7F

Preview Lab

Preview with #303B8A

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

Preview Lab → · Contrast checker → · Palette generator →