#304CBB#304CBB

#304CBB is a mid, vivid blue. Relative luminance 0.094; OKLCH L 46.5% C 0.178 H 267.9°. Best body text is #FFFFFF at 7.30:1 contrast (WCAG AA passes).

Color values

HEX	#304CBB
RGB	rgb(48, 76, 187)
HSL	hsl(228, 59%, 46%)
HSV	hsv(228, 74%, 73%)
CMYK	cmyk(74.3%, 59.4%, 0%, 26.7%)
CIE-LAB	lab(36.71, 28.88, -61.48)
CIE-LCH	lch(36.71, 67.92, 295.16°)
OKLab	oklab(46.54% -0.0065 -0.1775)
OKLCH	oklch(46.54% 0.178 267.9)
XYZ	xyz(12.7699, 9.3837, 48.1423)
Luminance	0.0939 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#304CBB #BB9F30

analogous

#3091BB #304CBB #5930BB

triadic

#304CBB #BB304C #4CBB30

tetradic

#304CBB #BB3091 #BB9F30 #30BB59

square

#304CBB #BB3091 #BB9F30 #30BB59

split-complementary

#304CBB #BB5930 #91BB30

monochromatic

#17245A #23388A #304CBB #556ED3 #8698E0

Accessibility & contrast

On white

7.30

#304CBB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.88

#304CBB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #304CBB

7.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##304CBB	#FFFFFF	#000000	##FFFFFF
##304CBB	1.00	7.30	2.88	7.30
#FFFFFF	7.30	1.00	21.00	1.00
#000000	2.88	21.00	1.00	21.00
##FFFFFF	7.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005DBF

Deuteranopia (green-blind)

#0050B9

Tritanopia (blue-blind)

#00687C

Achromatopsia (no color)

#565656

Design tokens & code

CSS

--color: #304cbb;
/* rgb */ color: rgb(48, 76, 187);
/* oklch */ color: oklch(46.5% 0.178 267.9);

Tailwind

colors: {
  custom: {
    50: '#7c7dd0',
    500: '#304cbb',
    950: '#000000',
  },
}

SCSS

$custom: #304cbb;
$custom-light: #7c7dd0;
$custom-dark: #000000;

JSON

{
  "hex": "#304cbb",
  "rgb": {
    "r": 48,
    "g": 76,
    "b": 187
  },
  "hsl": {
    "h": 227.914,
    "s": 59.149,
    "l": 46.078
  },
  "oklch": {
    "l": 0.46541,
    "c": 0.17761,
    "h": 267.9
  },
  "luminance": 0.09385
}

Semantic roles & 50–950 ramp

primary

#304CBB

secondary

#C9BA7D

accent

#C345E2

background

#F8F7FC

surface

#EFEEF9

border

#CAC9D2

text

#0B0914

muted

#7C7B82

Preview Lab

Preview with #304CBB

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

Preview Lab → · Contrast checker → · Palette generator →