#303FB4#303FB4

#303FB4 is a dark, vivid blue. Relative luminance 0.075; OKLCH L 43.5% C 0.184 H 270.8°. Best body text is #FFFFFF at 8.41:1 contrast (WCAG AA passes).

Color values

HEX	#303FB4
RGB	rgb(48, 63, 180)
HSL	hsl(233, 58%, 45%)
HSV	hsv(233, 73%, 71%)
CMYK	cmyk(73.3%, 65%, 0%, 29.4%)
CIE-LAB	lab(32.87, 34.71, -63.63)
CIE-LCH	lch(32.87, 72.48, 298.62°)
OKLab	oklab(43.52% 0.0025 -0.1839)
OKLCH	oklch(43.52% 0.184 270.8)
XYZ	xyz(11.2318, 7.4775, 44.0225)
Luminance	0.0748 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303FB4 #B4A530

analogous

#3081B4 #303FB4 #6330B4

triadic

#303FB4 #B4303F #3FB430

tetradic

#303FB4 #B43081 #B4A530 #30B463

square

#303FB4 #B43081 #B4A530 #30B463

split-complementary

#303FB4 #B46330 #81B430

monochromatic

#161D53 #232E84 #303FB4 #515FD1 #818BDD

Accessibility & contrast

On white

8.41

#303FB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.50

#303FB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303FB4

8.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303FB4	#FFFFFF	#000000	##FFFFFF
##303FB4	1.00	8.41	2.50	8.41
#FFFFFF	8.41	1.00	21.00	1.00
#000000	2.50	21.00	1.00	21.00
##FFFFFF	8.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0054B8

Deuteranopia (green-blind)

#0047B2

Tritanopia (blue-blind)

#005E74

Achromatopsia (no color)

#4D4D4D

Design tokens & code

CSS

--color: #303fb4;
/* rgb */ color: rgb(48, 63, 180);
/* oklch */ color: oklch(43.5% 0.184 270.8);

Tailwind

colors: {
  custom: {
    50: '#7c74cb',
    500: '#303fb4',
    950: '#000000',
  },
}

SCSS

$custom: #303fb4;
$custom-light: #7c74cb;
$custom-dark: #000000;

JSON

{
  "hex": "#303fb4",
  "rgb": {
    "r": 48,
    "g": 63,
    "b": 180
  },
  "hsl": {
    "h": 233.182,
    "s": 57.895,
    "l": 44.706
  },
  "oklch": {
    "l": 0.43519,
    "c": 0.18395,
    "h": 270.8
  },
  "luminance": 0.07479
}

Semantic roles & 50–950 ramp

primary

#303FB4

secondary

#C6BE79

accent

#D047E1

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0B0813

muted

#7C7B82

Preview Lab

Preview with #303FB4

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

Preview Lab → · Contrast checker → · Palette generator →