#304BB3#304BB3

#304BB3 is a mid, vivid blue. Relative luminance 0.089; OKLCH L 45.7% C 0.168 H 268.0°. Best body text is #FFFFFF at 7.55:1 contrast (WCAG AA passes).

Color values

HEX	#304BB3
RGB	rgb(48, 75, 179)
HSL	hsl(228, 58%, 45%)
HSV	hsv(228, 73%, 70%)
CMYK	cmyk(73.2%, 58.1%, 0%, 29.8%)
CIE-LAB	lab(35.82, 26.56, -58.22)
CIE-LCH	lch(35.82, 64.00, 294.52°)
OKLab	oklab(45.68% -0.006 -0.1679)
OKLCH	oklch(45.68% 0.168 268)
XYZ	xyz(11.8689, 8.9140, 43.7341)
Luminance	0.0891 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#304BB3 #B39830

analogous

#308CB3 #304BB3 #5730B3

triadic

#304BB3 #B3304B #4BB330

tetradic

#304BB3 #B3308C #B39830 #30B357

square

#304BB3 #B3308C #B39830 #30B357

split-complementary

#304BB3 #B35730 #8CB330

monochromatic

#162352 #233783 #304BB3 #506AD0 #8093DD

Accessibility & contrast

On white

7.55

#304BB3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.78

#304BB3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #304BB3

7.55:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##304BB3	#FFFFFF	#000000	##FFFFFF
##304BB3	1.00	7.55	2.78	7.55
#FFFFFF	7.55	1.00	21.00	1.00
#000000	2.78	21.00	1.00	21.00
##FFFFFF	7.55	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005BB7

Deuteranopia (green-blind)

#004EB1

Tritanopia (blue-blind)

#006577

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #304bb3;
/* rgb */ color: rgb(48, 75, 179);
/* oklch */ color: oklch(45.7% 0.168 268.0);

Tailwind

colors: {
  custom: {
    50: '#7b7ccb',
    500: '#304bb3',
    950: '#000000',
  },
}

SCSS

$custom: #304bb3;
$custom-light: #7b7ccb;
$custom-dark: #000000;

JSON

{
  "hex": "#304bb3",
  "rgb": {
    "r": 48,
    "g": 75,
    "b": 179
  },
  "hsl": {
    "h": 227.634,
    "s": 57.709,
    "l": 44.51
  },
  "oklch": {
    "l": 0.45675,
    "c": 0.16805,
    "h": 268
  },
  "luminance": 0.08915
}

Semantic roles & 50–950 ramp

primary

#304BB3

secondary

#C6B679

accent

#C147E1

background

#F8F7FC

surface

#EFEEF9

border

#CAC9D2

text

#0B0913

muted

#7C7B82

Preview Lab

Preview with #304BB3

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

Preview Lab → · Contrast checker → · Palette generator →