#303FB8#303FB8

#303FB8 is a dark, vivid blue. Relative luminance 0.076; OKLCH L 43.9% C 0.189 H 270.7°. Best body text is #FFFFFF at 8.30:1 contrast (WCAG AA passes).

Color values

HEX	#303FB8
RGB	rgb(48, 63, 184)
HSL	hsl(233, 59%, 45%)
HSV	hsv(233, 74%, 72%)
CMYK	cmyk(73.9%, 65.8%, 0%, 27.8%)
CIE-LAB	lab(33.23, 36.15, -65.41)
CIE-LCH	lch(33.23, 74.73, 298.93°)
OKLab	oklab(43.89% 0.0022 -0.1891)
OKLCH	oklch(43.89% 0.189 270.7)
XYZ	xyz(11.6452, 7.6429, 46.1996)
Luminance	0.0764 (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

#303FB8 #B8A930

analogous

#3083B8 #303FB8 #6530B8

triadic

#303FB8 #B8303F #3FB830

tetradic

#303FB8 #B83083 #B8A930 #30B865

square

#303FB8 #B83083 #B8A930 #30B865

split-complementary

#303FB8 #B86530 #83B830

monochromatic

#171E57 #232E87 #303FB8 #5361D2 #848EDF

Accessibility & contrast

On white

8.30

#303FB8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.53

#303FB8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303FB8

8.30:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303FB8	#FFFFFF	#000000	##FFFFFF
##303FB8	1.00	8.30	2.53	8.30
#FFFFFF	8.30	1.00	21.00	1.00
#000000	2.53	21.00	1.00	21.00
##FFFFFF	8.30	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055BC

Deuteranopia (green-blind)

#0048B6

Tritanopia (blue-blind)

#005F76

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #303fb8;
/* rgb */ color: rgb(48, 63, 184);
/* oklch */ color: oklch(43.9% 0.189 270.7);

Tailwind

colors: {
  custom: {
    50: '#7d74ce',
    500: '#303fb8',
    950: '#000000',
  },
}

SCSS

$custom: #303fb8;
$custom-light: #7d74ce;
$custom-dark: #000000;

JSON

{
  "hex": "#303fb8",
  "rgb": {
    "r": 48,
    "g": 63,
    "b": 184
  },
  "hsl": {
    "h": 233.382,
    "s": 58.621,
    "l": 45.49
  },
  "oklch": {
    "l": 0.4389,
    "c": 0.18915,
    "h": 270.7
  },
  "luminance": 0.07644
}

Semantic roles & 50–950 ramp

primary

#303FB8

secondary

#C8C07C

accent

#D146E2

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0B0814

muted

#7C7B82

Preview Lab

Preview with #303FB8

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

Preview Lab → · Contrast checker → · Palette generator →