#303C8B#303C8B

#303C8B is a dark, vivid blue. Relative luminance 0.057; OKLCH L 39.4% C 0.131 H 272.4°. Best body text is #FFFFFF at 9.79:1 contrast (WCAG AA passes).

Color values

HEX	#303C8B
RGB	rgb(48, 60, 139)
HSL	hsl(232, 49%, 37%)
HSV	hsv(232, 65%, 55%)
CMYK	cmyk(65.5%, 56.8%, 0%, 45.5%)
CIE-LAB	lab(28.70, 21.71, -45.61)
CIE-LCH	lch(28.70, 50.51, 295.45°)
OKLab	oklab(39.38% 0.0055 -0.131)
OKLCH	oklch(39.38% 0.131 272.4)
XYZ	xyz(7.4934, 5.7235, 25.1310)
Luminance	0.0572 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303C8B #8B7F30

analogous

#306A8B #303C8B #52308B

triadic

#303C8B #8B303C #3C8B30

tetradic

#303C8B #8B306A #8B7F30 #308B52

square

#303C8B #8B306A #8B7F30 #308B52

split-complementary

#303C8B #8B5230 #6A8B30

monochromatic

#111530 #20285E #303C8B #4050B8 #6A77CC

Accessibility & contrast

On white

9.79

#303C8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.14

#303C8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303C8B

9.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303C8B	#FFFFFF	#000000	##FFFFFF
##303C8B	1.00	9.79	2.14	9.79
#FFFFFF	9.79	1.00	21.00	1.00
#000000	2.14	21.00	1.00	21.00
##FFFFFF	9.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00488E

Deuteranopia (green-blind)

#004089

Tritanopia (blue-blind)

#004F5D

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #303c8b;
/* rgb */ color: rgb(48, 60, 139);
/* oklch */ color: oklch(39.4% 0.131 272.4);

Tailwind

colors: {
  custom: {
    50: '#7371ad',
    500: '#303c8b',
    950: '#000000',
  },
}

SCSS

$custom: #303c8b;
$custom-light: #7371ad;
$custom-dark: #000000;

JSON

{
  "hex": "#303c8b",
  "rgb": {
    "r": 48,
    "g": 60,
    "b": 139
  },
  "hsl": {
    "h": 232.088,
    "s": 48.663,
    "l": 36.667
  },
  "oklch": {
    "l": 0.39377,
    "c": 0.13116,
    "h": 272.4
  },
  "luminance": 0.05724
}

Semantic roles & 50–950 ramp

primary

#303C8B

secondary

#B3A864

accent

#C650D8

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#090710

muted

#7B7A7F

Preview Lab

Preview with #303C8B

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

Preview Lab → · Contrast checker → · Palette generator →