#303DB1#303DB1

#303DB1 is a dark, vivid blue. Relative luminance 0.071; OKLCH L 42.9% C 0.182 H 271.3°. Best body text is #FFFFFF at 8.65:1 contrast (WCAG AA passes).

Color values

HEX	#303DB1
RGB	rgb(48, 61, 177)
HSL	hsl(234, 57%, 44%)
HSV	hsv(234, 73%, 69%)
CMYK	cmyk(72.9%, 65.5%, 0%, 30.6%)
CIE-LAB	lab(32.12, 34.91, -63.07)
CIE-LCH	lch(32.12, 72.09, 298.96°)
OKLab	oklab(42.89% 0.004 -0.1823)
OKLCH	oklch(42.89% 0.182 271.3)
XYZ	xyz(10.8208, 7.1391, 42.3942)
Luminance	0.0714 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303DB1 #B1A430

analogous

#307EB1 #303DB1 #6330B1

triadic

#303DB1 #B1303D #3DB130

tetradic

#303DB1 #B1307E #B1A430 #30B163

square

#303DB1 #B1307E #B1A430 #30B163

split-complementary

#303DB1 #B16330 #7EB130

monochromatic

#161C51 #232C81 #303DB1 #4F5CCF #7F88DC

Accessibility & contrast

On white

8.65

#303DB1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.43

#303DB1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303DB1

8.65:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303DB1	#FFFFFF	#000000	##FFFFFF
##303DB1	1.00	8.65	2.43	8.65
#FFFFFF	8.65	1.00	21.00	1.00
#000000	2.43	21.00	1.00	21.00
##FFFFFF	8.65	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052B5

Deuteranopia (green-blind)

#0046AF

Tritanopia (blue-blind)

#005C71

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #303db1;
/* rgb */ color: rgb(48, 61, 177);
/* oklch */ color: oklch(42.9% 0.182 271.3);

Tailwind

colors: {
  custom: {
    50: '#7b72c9',
    500: '#303db1',
    950: '#000000',
  },
}

SCSS

$custom: #303db1;
$custom-light: #7b72c9;
$custom-dark: #000000;

JSON

{
  "hex": "#303db1",
  "rgb": {
    "r": 48,
    "g": 61,
    "b": 177
  },
  "hsl": {
    "h": 233.953,
    "s": 57.333,
    "l": 44.118
  },
  "oklch": {
    "l": 0.42889,
    "c": 0.18235,
    "h": 271.3
  },
  "luminance": 0.0714
}

Semantic roles & 50–950 ramp

primary

#303DB1

secondary

#C5BD78

accent

#D147E1

background

#F8F6FC

surface

#EFECF8

border

#CAC7D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #303DB1

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

Preview Lab → · Contrast checker → · Palette generator →