#303B9E#303B9E

#303B9E is a dark, vivid blue. Relative luminance 0.062; OKLCH L 40.8% C 0.159 H 272.3°. Best body text is #FFFFFF at 9.35:1 contrast (WCAG AA passes).

Color values

HEX	#303B9E
RGB	rgb(48, 59, 158)
HSL	hsl(234, 53%, 40%)
HSV	hsv(234, 70%, 62%)
CMYK	cmyk(69.6%, 62.7%, 0%, 38%)
CIE-LAB	lab(29.97, 29.34, -55.18)
CIE-LCH	lch(29.97, 62.50, 298.00°)
OKLab	oklab(40.8% 0.0064 -0.1592)
OKLCH	oklch(40.8% 0.159 272.3)
XYZ	xyz(8.9524, 6.2241, 33.0707)
Luminance	0.0622 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303B9E #9E9330

analogous

#30729E #303B9E #5C309E

triadic

#303B9E #9E303B #3B9E30

tetradic

#303B9E #9E3072 #9E9330 #309E5C

square

#303B9E #9E3072 #9E9330 #309E5C

split-complementary

#303B9E #9E5C30 #729E30

monochromatic

#131840 #22296F #303B9E #4552C6 #747DD5

Accessibility & contrast

On white

9.35

#303B9E on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.25

#303B9E on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303B9E

9.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303B9E	#FFFFFF	#000000	##FFFFFF
##303B9E	1.00	9.35	2.25	9.35
#FFFFFF	9.35	1.00	21.00	1.00
#000000	2.25	21.00	1.00	21.00
##FFFFFF	9.35	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004CA1

Deuteranopia (green-blind)

#00429C

Tritanopia (blue-blind)

#005467

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #303b9e;
/* rgb */ color: rgb(48, 59, 158);
/* oklch */ color: oklch(40.8% 0.159 272.3);

Tailwind

colors: {
  custom: {
    50: '#7771bb',
    500: '#303b9e',
    950: '#000000',
  },
}

SCSS

$custom: #303b9e;
$custom-light: #7771bb;
$custom-dark: #000000;

JSON

{
  "hex": "#303b9e",
  "rgb": {
    "r": 48,
    "g": 59,
    "b": 158
  },
  "hsl": {
    "h": 234,
    "s": 53.398,
    "l": 40.392
  },
  "oklch": {
    "l": 0.40798,
    "c": 0.15931,
    "h": 272.3
  },
  "luminance": 0.06225
}

Semantic roles & 50–950 ramp

primary

#303B9E

secondary

#BDB56D

accent

#CE4BDD

background

#F7F6FB

surface

#EEECF6

border

#C9C7D0

text

#0A0712

muted

#7C7A81

Preview Lab

Preview with #303B9E

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

Preview Lab → · Contrast checker → · Palette generator →