#303DB4#303DB4

#303DB4 is a dark, vivid blue. Relative luminance 0.073; OKLCH L 43.2% C 0.186 H 271.2°. Best body text is #FFFFFF at 8.56:1 contrast (WCAG AA passes).

Color values

HEX	#303DB4
RGB	rgb(48, 61, 180)
HSL	hsl(234, 58%, 45%)
HSV	hsv(234, 73%, 71%)
CMYK	cmyk(73.3%, 66.1%, 0%, 29.4%)
CIE-LAB	lab(32.39, 35.98, -64.41)
CIE-LCH	lch(32.39, 73.78, 299.19°)
OKLab	oklab(43.17% 0.0038 -0.1862)
OKLCH	oklch(43.17% 0.186 271.2)
XYZ	xyz(11.1231, 7.2600, 43.9863)
Luminance	0.0726 (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

#303DB4 #B4A730

analogous

#307FB4 #303DB4 #6530B4

triadic

#303DB4 #B4303D #3DB430

tetradic

#303DB4 #B4307F #B4A730 #30B465

square

#303DB4 #B4307F #B4A730 #30B465

split-complementary

#303DB4 #B46530 #7FB430

monochromatic

#161C53 #232D84 #303DB4 #515DD1 #818ADD

Accessibility & contrast

On white

8.56

#303DB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.45

#303DB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303DB4

8.56:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303DB4	#FFFFFF	#000000	##FFFFFF
##303DB4	1.00	8.56	2.45	8.56
#FFFFFF	8.56	1.00	21.00	1.00
#000000	2.45	21.00	1.00	21.00
##FFFFFF	8.56	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052B8

Deuteranopia (green-blind)

#0046B2

Tritanopia (blue-blind)

#005D73

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #303db4;
/* rgb */ color: rgb(48, 61, 180);
/* oklch */ color: oklch(43.2% 0.186 271.2);

Tailwind

colors: {
  custom: {
    50: '#7c72cc',
    500: '#303db4',
    950: '#000000',
  },
}

SCSS

$custom: #303db4;
$custom-light: #7c72cc;
$custom-dark: #000000;

JSON

{
  "hex": "#303db4",
  "rgb": {
    "r": 48,
    "g": 61,
    "b": 180
  },
  "hsl": {
    "h": 234.091,
    "s": 57.895,
    "l": 44.706
  },
  "oklch": {
    "l": 0.43169,
    "c": 0.18627,
    "h": 271.2
  },
  "luminance": 0.07261
}

Semantic roles & 50–950 ramp

primary

#303DB4

secondary

#C6BF79

accent

#D247E1

background

#F8F6FC

surface

#EFECF9

border

#CAC7D2

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #303DB4

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

Preview Lab → · Contrast checker → · Palette generator →