#303B99#303B99

#303B99 is a dark, vivid blue. Relative luminance 0.061; OKLCH L 40.4% C 0.152 H 272.5°. Best body text is #FFFFFF at 9.50:1 contrast (WCAG AA passes).

Color values

HEX	#303B99
RGB	rgb(48, 59, 153)
HSL	hsl(234, 52%, 39%)
HSV	hsv(234, 69%, 60%)
CMYK	cmyk(68.6%, 61.4%, 0%, 40%)
CIE-LAB	lab(29.55, 27.52, -52.82)
CIE-LCH	lch(29.55, 59.56, 297.52°)
OKLab	oklab(40.36% 0.0066 -0.1523)
OKLCH	oklch(40.36% 0.152 272.5)
XYZ	xyz(8.5307, 6.0554, 30.8501)
Luminance	0.0606 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303B99 #998E30

analogous

#307099 #303B99 #593099

triadic

#303B99 #99303B #3B9930

tetradic

#303B99 #993070 #998E30 #309959

square

#303B99 #993070 #998E30 #309959

split-complementary

#303B99 #995930 #709930

monochromatic

#13173C #21296A #303B99 #4250C4 #717BD2

Accessibility & contrast

On white

9.50

#303B99 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.21

#303B99 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303B99

9.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303B99	#FFFFFF	#000000	##FFFFFF
##303B99	1.00	9.50	2.21	9.50
#FFFFFF	9.50	1.00	21.00	1.00
#000000	2.21	21.00	1.00	21.00
##FFFFFF	9.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004A9C

Deuteranopia (green-blind)

#004197

Tritanopia (blue-blind)

#005264

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #303b99;
/* rgb */ color: rgb(48, 59, 153);
/* oklch */ color: oklch(40.4% 0.152 272.5);

Tailwind

colors: {
  custom: {
    50: '#7671b8',
    500: '#303b99',
    950: '#000000',
  },
}

SCSS

$custom: #303b99;
$custom-light: #7671b8;
$custom-dark: #000000;

JSON

{
  "hex": "#303b99",
  "rgb": {
    "r": 48,
    "g": 59,
    "b": 153
  },
  "hsl": {
    "h": 233.714,
    "s": 52.239,
    "l": 39.412
  },
  "oklch": {
    "l": 0.40358,
    "c": 0.1524,
    "h": 272.5
  },
  "luminance": 0.06056
}

Semantic roles & 50–950 ramp

primary

#303B99

secondary

#BAB26B

accent

#CD4CDC

background

#F7F6FB

surface

#EEECF6

border

#C9C7D0

text

#0A0711

muted

#7C7A80

Preview Lab

Preview with #303B99

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

Preview Lab → · Contrast checker → · Palette generator →