#303B8D#303B8D

#303B8D is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.3% C 0.135 H 272.8°. Best body text is #FFFFFF at 9.83:1 contrast (WCAG AA passes).

Color values

HEX	#303B8D
RGB	rgb(48, 59, 141)
HSL	hsl(233, 49%, 37%)
HSV	hsv(233, 66%, 55%)
CMYK	cmyk(66%, 58.2%, 0%, 44.7%)
CIE-LAB	lab(28.59, 23.12, -47.03)
CIE-LCH	lch(28.59, 52.41, 296.18°)
OKLab	oklab(39.34% 0.0065 -0.1352)
OKLCH	oklch(39.34% 0.135 272.8)
XYZ	xyz(7.5890, 5.6787, 25.8903)
Luminance	0.0568 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303B8D #8D8230

analogous

#306A8D #303B8D #54308D

triadic

#303B8D #8D303B #3B8D30

tetradic

#303B8D #8D306A #8D8230 #308D54

square

#303B8D #8D306A #8D8230 #308D54

split-complementary

#303B8D #8D5430 #6A8D30

monochromatic

#111532 #20285F #303B8D #404EBB #6B76CD

Accessibility & contrast

On white

9.83

#303B8D on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#303B8D on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303B8D

9.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303B8D	#FFFFFF	#000000	##FFFFFF
##303B8D	1.00	9.83	2.14	9.83
#FFFFFF	9.83	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004890

Deuteranopia (green-blind)

#003F8B

Tritanopia (blue-blind)

#004F5E

Achromatopsia (no color)

#434343

Design tokens & code

CSS

--color: #303b8d;
/* rgb */ color: rgb(48, 59, 141);
/* oklch */ color: oklch(39.3% 0.135 272.8);

Tailwind

colors: {
  custom: {
    50: '#7370af',
    500: '#303b8d',
    950: '#000000',
  },
}

SCSS

$custom: #303b8d;
$custom-light: #7370af;
$custom-dark: #000000;

JSON

{
  "hex": "#303b8d",
  "rgb": {
    "r": 48,
    "g": 59,
    "b": 141
  },
  "hsl": {
    "h": 232.903,
    "s": 49.206,
    "l": 37.059
  },
  "oklch": {
    "l": 0.39338,
    "c": 0.1354,
    "h": 272.8
  },
  "luminance": 0.05679
}

Semantic roles & 50–950 ramp

primary

#303B8D

secondary

#B4AB65

accent

#C84FD9

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#090710

muted

#7B7A7F

Preview Lab

Preview with #303B8D

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

Preview Lab → · Contrast checker → · Palette generator →