#304DB3#304DB3

#304DB3 is a mid, vivid blue. Relative luminance 0.092; OKLCH L 46.1% C 0.166 H 267.4°. Best body text is #FFFFFF at 7.40:1 contrast (WCAG AA passes).

Color values

HEX	#304DB3
RGB	rgb(48, 77, 179)
HSL	hsl(227, 58%, 45%)
HSV	hsv(227, 73%, 70%)
CMYK	cmyk(73.2%, 57%, 0%, 29.8%)
CIE-LAB	lab(36.35, 25.25, -57.36)
CIE-LCH	lch(36.35, 62.67, 293.76°)
OKLab	oklab(46.07% -0.0075 -0.1654)
OKLCH	oklch(46.07% 0.166 267.4)
XYZ	xyz(12.0067, 9.1895, 43.7801)
Luminance	0.0919 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#304DB3 #B39630

analogous

#308EB3 #304DB3 #5530B3

triadic

#304DB3 #B3304D #4DB330

tetradic

#304DB3 #B3308E #B39630 #30B355

square

#304DB3 #B3308E #B39630 #30B355

split-complementary

#304DB3 #B35530 #8EB330

monochromatic

#162352 #233883 #304DB3 #506CD0 #8095DD

Accessibility & contrast

On white

7.40

#304DB3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.84

#304DB3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #304DB3

7.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##304DB3	#FFFFFF	#000000	##FFFFFF
##304DB3	1.00	7.40	2.84	7.40
#FFFFFF	7.40	1.00	21.00	1.00
#000000	2.84	21.00	1.00	21.00
##FFFFFF	7.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005CB6

Deuteranopia (green-blind)

#0050B1

Tritanopia (blue-blind)

#006678

Achromatopsia (no color)

#555555

Design tokens & code

CSS

--color: #304db3;
/* rgb */ color: rgb(48, 77, 179);
/* oklch */ color: oklch(46.1% 0.166 267.4);

Tailwind

colors: {
  custom: {
    50: '#7a7ecb',
    500: '#304db3',
    950: '#000000',
  },
}

SCSS

$custom: #304db3;
$custom-light: #7a7ecb;
$custom-dark: #000000;

JSON

{
  "hex": "#304db3",
  "rgb": {
    "r": 48,
    "g": 77,
    "b": 179
  },
  "hsl": {
    "h": 226.718,
    "s": 57.709,
    "l": 44.51
  },
  "oklch": {
    "l": 0.46071,
    "c": 0.16555,
    "h": 267.4
  },
  "luminance": 0.09191
}

Semantic roles & 50–950 ramp

primary

#304DB3

secondary

#C6B579

accent

#BF47E1

background

#F8F7FC

surface

#EFEEF8

border

#CAC9D1

text

#0B0913

muted

#7C7B82

Preview Lab

Preview with #304DB3

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

Preview Lab → · Contrast checker → · Palette generator →