#303FB1#303FB1

#303FB1 is a dark, vivid blue. Relative luminance 0.074; OKLCH L 43.2% C 0.180 H 270.8°. Best body text is #FFFFFF at 8.50:1 contrast (WCAG AA passes).

Color values

HEX	#303FB1
RGB	rgb(48, 63, 177)
HSL	hsl(233, 57%, 44%)
HSV	hsv(233, 73%, 69%)
CMYK	cmyk(72.9%, 64.4%, 0%, 30.6%)
CIE-LAB	lab(32.61, 33.63, -62.28)
CIE-LCH	lch(32.61, 70.78, 298.37°)
OKLab	oklab(43.24% 0.0027 -0.18)
OKLCH	oklch(43.24% 0.18 270.8)
XYZ	xyz(10.9295, 7.3566, 42.4304)
Luminance	0.0736 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303FB1 #B1A230

analogous

#3080B1 #303FB1 #6230B1

triadic

#303FB1 #B1303F #3FB130

tetradic

#303FB1 #B13080 #B1A230 #30B162

square

#303FB1 #B13080 #B1A230 #30B162

split-complementary

#303FB1 #B16230 #80B130

monochromatic

#161D51 #232E81 #303FB1 #4F5ECF #7F8ADC

Accessibility & contrast

On white

8.50

#303FB1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.47

#303FB1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303FB1

8.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303FB1	#FFFFFF	#000000	##FFFFFF
##303FB1	1.00	8.50	2.47	8.50
#FFFFFF	8.50	1.00	21.00	1.00
#000000	2.47	21.00	1.00	21.00
##FFFFFF	8.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B5

Deuteranopia (green-blind)

#0047AF

Tritanopia (blue-blind)

#005D72

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #303fb1;
/* rgb */ color: rgb(48, 63, 177);
/* oklch */ color: oklch(43.2% 0.180 270.8);

Tailwind

colors: {
  custom: {
    50: '#7b74c9',
    500: '#303fb1',
    950: '#000000',
  },
}

SCSS

$custom: #303fb1;
$custom-light: #7b74c9;
$custom-dark: #000000;

JSON

{
  "hex": "#303fb1",
  "rgb": {
    "r": 48,
    "g": 63,
    "b": 177
  },
  "hsl": {
    "h": 233.023,
    "s": 57.333,
    "l": 44.118
  },
  "oklch": {
    "l": 0.43243,
    "c": 0.18,
    "h": 270.8
  },
  "luminance": 0.07358
}

Semantic roles & 50–950 ramp

primary

#303FB1

secondary

#C5BC78

accent

#CF47E1

background

#F8F7FC

surface

#EFEDF8

border

#CAC8D1

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #303FB1

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

Preview Lab → · Contrast checker → · Palette generator →