#304BB1#304BB1

#304BB1 is a mid, vivid blue. Relative luminance 0.088; OKLCH L 45.5% C 0.165 H 267.9°. Best body text is #FFFFFF at 7.59:1 contrast (WCAG AA passes).

Color values

HEX	#304BB1
RGB	rgb(48, 75, 177)
HSL	hsl(227, 57%, 44%)
HSV	hsv(227, 73%, 69%)
CMYK	cmyk(72.9%, 57.6%, 0%, 30.6%)
CIE-LAB	lab(35.66, 25.82, -57.29)
CIE-LCH	lch(35.66, 62.84, 294.26°)
OKLab	oklab(45.51% -0.006 -0.1652)
OKLCH	oklch(45.51% 0.165 267.9)
XYZ	xyz(11.6681, 8.8336, 42.6766)
Luminance	0.0883 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#304BB1 #B19630

analogous

#308CB1 #304BB1 #5630B1

triadic

#304BB1 #B1304B #4BB130

tetradic

#304BB1 #B1308C #B19630 #30B156

square

#304BB1 #B1308C #B19630 #30B156

split-complementary

#304BB1 #B15630 #8CB130

monochromatic

#162251 #233781 #304BB1 #4F6ACF #7F93DC

Accessibility & contrast

On white

7.59

#304BB1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.77

#304BB1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #304BB1

7.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##304BB1	#FFFFFF	#000000	##FFFFFF
##304BB1	1.00	7.59	2.77	7.59
#FFFFFF	7.59	1.00	21.00	1.00
#000000	2.77	21.00	1.00	21.00
##FFFFFF	7.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005AB4

Deuteranopia (green-blind)

#004EAF

Tritanopia (blue-blind)

#006476

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #304bb1;
/* rgb */ color: rgb(48, 75, 177);
/* oklch */ color: oklch(45.5% 0.165 267.9);

Tailwind

colors: {
  custom: {
    50: '#7a7cc9',
    500: '#304bb1',
    950: '#000000',
  },
}

SCSS

$custom: #304bb1;
$custom-light: #7a7cc9;
$custom-dark: #000000;

JSON

{
  "hex": "#304bb1",
  "rgb": {
    "r": 48,
    "g": 75,
    "b": 177
  },
  "hsl": {
    "h": 227.442,
    "s": 57.333,
    "l": 44.118
  },
  "oklch": {
    "l": 0.45509,
    "c": 0.16532,
    "h": 267.9
  },
  "luminance": 0.08835
}

Semantic roles & 50–950 ramp

primary

#304BB1

secondary

#C5B578

accent

#C047E1

background

#F8F7FC

surface

#EFEEF8

border

#CAC9D1

text

#0B0913

muted

#7C7B82

Preview Lab

Preview with #304BB1

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

Preview Lab → · Contrast checker → · Palette generator →