#303B9C#303B9C

#303B9C is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.6% C 0.157 H 272.4°. Best body text is #FFFFFF at 9.41:1 contrast (WCAG AA passes).

Color values

HEX	#303B9C
RGB	rgb(48, 59, 156)
HSL	hsl(234, 53%, 40%)
HSV	hsv(234, 69%, 61%)
CMYK	cmyk(69.2%, 62.2%, 0%, 38.8%)
CIE-LAB	lab(29.80, 28.61, -54.24)
CIE-LCH	lch(29.80, 61.33, 297.81°)
OKLab	oklab(40.62% 0.0065 -0.1564)
OKLCH	oklch(40.62% 0.157 272.4)
XYZ	xyz(8.7816, 6.1558, 32.1714)
Luminance	0.0616 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303B9C #9C9130

analogous

#30719C #303B9C #5B309C

triadic

#303B9C #9C303B #3B9C30

tetradic

#303B9C #9C3071 #9C9130 #309C5B

square

#303B9C #9C3071 #9C9130 #309C5B

split-complementary

#303B9C #9C5B30 #719C30

monochromatic

#13183E #22296D #303B9C #4451C5 #737CD4

Accessibility & contrast

On white

9.41

#303B9C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.23

#303B9C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303B9C

9.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303B9C	#FFFFFF	#000000	##FFFFFF
##303B9C	1.00	9.41	2.23	9.41
#FFFFFF	9.41	1.00	21.00	1.00
#000000	2.23	21.00	1.00	21.00
##FFFFFF	9.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004B9F

Deuteranopia (green-blind)

#00419A

Tritanopia (blue-blind)

#005365

Achromatopsia (no color)

#464646

Design tokens & code

CSS

--color: #303b9c;
/* rgb */ color: rgb(48, 59, 156);
/* oklch */ color: oklch(40.6% 0.157 272.4);

Tailwind

colors: {
  custom: {
    50: '#7771ba',
    500: '#303b9c',
    950: '#000000',
  },
}

SCSS

$custom: #303b9c;
$custom-light: #7771ba;
$custom-dark: #000000;

JSON

{
  "hex": "#303b9c",
  "rgb": {
    "r": 48,
    "g": 59,
    "b": 156
  },
  "hsl": {
    "h": 233.889,
    "s": 52.941,
    "l": 40
  },
  "oklch": {
    "l": 0.40621,
    "c": 0.15656,
    "h": 272.4
  },
  "luminance": 0.06157
}

Semantic roles & 50–950 ramp

primary

#303B9C

secondary

#BCB46C

accent

#CE4BDC

background

#F7F6FB

surface

#EEECF6

border

#C9C7D0

text

#0A0712

muted

#7C7A81

Preview Lab

Preview with #303B9C

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

Preview Lab → · Contrast checker → · Palette generator →