#303D8B#303D8B

#303D8B is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.6% C 0.130 H 272.0°. Best body text is #FFFFFF at 9.70:1 contrast (WCAG AA passes).

Color values

HEX	#303D8B
RGB	rgb(48, 61, 139)
HSL	hsl(231, 49%, 37%)
HSV	hsv(231, 65%, 55%)
CMYK	cmyk(65.5%, 56.1%, 0%, 45.5%)
CIE-LAB	lab(28.98, 21.03, -45.16)
CIE-LCH	lch(28.98, 49.82, 294.97°)
OKLab	oklab(39.58% 0.0045 -0.1297)
OKLCH	oklch(39.58% 0.13 272)
XYZ	xyz(7.5463, 5.8293, 25.1486)
Luminance	0.0583 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303D8B #8B7E30

analogous

#306B8B #303D8B #51308B

triadic

#303D8B #8B303D #3D8B30

tetradic

#303D8B #8B306B #8B7E30 #308B51

square

#303D8B #8B306B #8B7E30 #308B51

split-complementary

#303D8B #8B5130 #6B8B30

monochromatic

#111530 #20295E #303D8B #4051B8 #6A78CC

Accessibility & contrast

On white

9.70

#303D8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.17

#303D8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303D8B

9.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303D8B	#FFFFFF	#000000	##FFFFFF
##303D8B	1.00	9.70	2.17	9.70
#FFFFFF	9.70	1.00	21.00	1.00
#000000	2.17	21.00	1.00	21.00
##FFFFFF	9.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#02488E

Deuteranopia (green-blind)

#004089

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #303d8b;
/* rgb */ color: rgb(48, 61, 139);
/* oklch */ color: oklch(39.6% 0.130 272.0);

Tailwind

colors: {
  custom: {
    50: '#7372ad',
    500: '#303d8b',
    950: '#000000',
  },
}

SCSS

$custom: #303d8b;
$custom-light: #7372ad;
$custom-dark: #000000;

JSON

{
  "hex": "#303d8b",
  "rgb": {
    "r": 48,
    "g": 61,
    "b": 139
  },
  "hsl": {
    "h": 231.429,
    "s": 48.663,
    "l": 36.667
  },
  "oklch": {
    "l": 0.39582,
    "c": 0.1298,
    "h": 272
  },
  "luminance": 0.0583
}

Semantic roles & 50–950 ramp

primary

#303D8B

secondary

#B3A864

accent

#C550D8

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#090710

muted

#7B7A7F

Preview Lab

Preview with #303D8B

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

Preview Lab → · Contrast checker → · Palette generator →