#303FB3#303FB3

#303FB3 is a dark, vivid blue. Relative luminance 0.074; OKLCH L 43.4% C 0.183 H 270.8°. Best body text is #FFFFFF at 8.44:1 contrast (WCAG AA passes).

Color values

HEX	#303FB3
RGB	rgb(48, 63, 179)
HSL	hsl(233, 58%, 45%)
HSV	hsv(233, 73%, 70%)
CMYK	cmyk(73.2%, 64.8%, 0%, 29.8%)
CIE-LAB	lab(32.78, 34.36, -63.18)
CIE-LCH	lch(32.78, 71.92, 298.54°)
OKLab	oklab(43.43% 0.0025 -0.1826)
OKLCH	oklch(43.43% 0.183 270.8)
XYZ	xyz(11.1303, 7.4369, 43.4880)
Luminance	0.0744 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303FB3 #B3A430

analogous

#3081B3 #303FB3 #6330B3

triadic

#303FB3 #B3303F #3FB330

tetradic

#303FB3 #B33081 #B3A430 #30B363

square

#303FB3 #B33081 #B3A430 #30B363

split-complementary

#303FB3 #B36330 #81B330

monochromatic

#161D52 #232E83 #303FB3 #505FD0 #808BDD

Accessibility & contrast

On white

8.44

#303FB3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.49

#303FB3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303FB3

8.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303FB3	#FFFFFF	#000000	##FFFFFF
##303FB3	1.00	8.44	2.49	8.44
#FFFFFF	8.44	1.00	21.00	1.00
#000000	2.49	21.00	1.00	21.00
##FFFFFF	8.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B7

Deuteranopia (green-blind)

#0047B1

Tritanopia (blue-blind)

#005D73

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #303fb3;
/* rgb */ color: rgb(48, 63, 179);
/* oklch */ color: oklch(43.4% 0.183 270.8);

Tailwind

colors: {
  custom: {
    50: '#7b74cb',
    500: '#303fb3',
    950: '#000000',
  },
}

SCSS

$custom: #303fb3;
$custom-light: #7b74cb;
$custom-dark: #000000;

JSON

{
  "hex": "#303fb3",
  "rgb": {
    "r": 48,
    "g": 63,
    "b": 179
  },
  "hsl": {
    "h": 233.13,
    "s": 57.709,
    "l": 44.51
  },
  "oklch": {
    "l": 0.43426,
    "c": 0.18263,
    "h": 270.8
  },
  "luminance": 0.07438
}

Semantic roles & 50–950 ramp

primary

#303FB3

secondary

#C6BD79

accent

#CF47E1

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #303FB3

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

Preview Lab → · Contrast checker → · Palette generator →