#303B8F#303B8F

#303B8F is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.5% C 0.138 H 272.7°. Best body text is #FFFFFF at 9.78:1 contrast (WCAG AA passes).

Color values

HEX	#303B8F
RGB	rgb(48, 59, 143)
HSL	hsl(233, 50%, 37%)
HSV	hsv(233, 66%, 56%)
CMYK	cmyk(66.4%, 58.7%, 0%, 43.9%)
CIE-LAB	lab(28.74, 23.85, -48.01)
CIE-LCH	lch(28.74, 53.61, 296.42°)
OKLab	oklab(39.5% 0.0066 -0.1381)
OKLCH	oklch(39.5% 0.138 272.7)
XYZ	xyz(7.7392, 5.7388, 26.6811)
Luminance	0.0574 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303B8F #8F8430

analogous

#306A8F #303B8F #55308F

triadic

#303B8F #8F303B #3B8F30

tetradic

#303B8F #8F306A #8F8430 #308F55

square

#303B8F #8F306A #8F8430 #308F55

split-complementary

#303B8F #8F5530 #6A8F30

monochromatic

#111533 #212861 #303B8F #3F4EBD #6C77CE

Accessibility & contrast

On white

9.78

#303B8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.15

#303B8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303B8F

9.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303B8F	#FFFFFF	#000000	##FFFFFF
##303B8F	1.00	9.78	2.15	9.78
#FFFFFF	9.78	1.00	21.00	1.00
#000000	2.15	21.00	1.00	21.00
##FFFFFF	9.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004892

Deuteranopia (green-blind)

#00408D

Tritanopia (blue-blind)

#004F5F

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #303b8f;
/* rgb */ color: rgb(48, 59, 143);
/* oklch */ color: oklch(39.5% 0.138 272.7);

Tailwind

colors: {
  custom: {
    50: '#7470b0',
    500: '#303b8f',
    950: '#000000',
  },
}

SCSS

$custom: #303b8f;
$custom-light: #7470b0;
$custom-dark: #000000;

JSON

{
  "hex": "#303b8f",
  "rgb": {
    "r": 48,
    "g": 59,
    "b": 143
  },
  "hsl": {
    "h": 233.053,
    "s": 49.738,
    "l": 37.451
  },
  "oklch": {
    "l": 0.39504,
    "c": 0.13828,
    "h": 272.7
  },
  "luminance": 0.05739
}

Semantic roles & 50–950 ramp

primary

#303B8F

secondary

#B5AC66

accent

#C94FD9

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#090711

muted

#7B7A80

Preview Lab

Preview with #303B8F

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

Preview Lab → · Contrast checker → · Palette generator →