#303E8B#303E8B

#303E8B is a dark, vivid blue. Relative luminance 0.059; OKLCH L 39.8% C 0.128 H 271.6°. Best body text is #FFFFFF at 9.60:1 contrast (WCAG AA passes).

Color values

HEX	#303E8B
RGB	rgb(48, 62, 139)
HSL	hsl(231, 49%, 37%)
HSV	hsv(231, 65%, 55%)
CMYK	cmyk(65.5%, 55.4%, 0%, 45.5%)
CIE-LAB	lab(29.25, 20.35, -44.72)
CIE-LCH	lch(29.25, 49.13, 294.47°)
OKLab	oklab(39.79% 0.0035 -0.1284)
OKLCH	oklch(39.79% 0.128 271.6)
XYZ	xyz(7.6002, 5.9370, 25.1665)
Luminance	0.0594 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#303E8B #8B7D30

analogous

#306C8B #303E8B #50308B

triadic

#303E8B #8B303E #3E8B30

tetradic

#303E8B #8B306C #8B7D30 #308B50

square

#303E8B #8B306C #8B7D30 #308B50

split-complementary

#303E8B #8B5030 #6C8B30

monochromatic

#111530 #202A5E #303E8B #4052B8 #6A79CC

Accessibility & contrast

On white

9.60

#303E8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.19

#303E8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #303E8B

9.60:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##303E8B	#FFFFFF	#000000	##FFFFFF
##303E8B	1.00	9.60	2.19	9.60
#FFFFFF	9.60	1.00	21.00	1.00
#000000	2.19	21.00	1.00	21.00
##FFFFFF	9.60	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#08498E

Deuteranopia (green-blind)

#004189

Tritanopia (blue-blind)

#00505E

Achromatopsia (no color)

#454545

Design tokens & code

CSS

--color: #303e8b;
/* rgb */ color: rgb(48, 62, 139);
/* oklch */ color: oklch(39.8% 0.128 271.6);

Tailwind

colors: {
  custom: {
    50: '#7373ad',
    500: '#303e8b',
    950: '#000000',
  },
}

SCSS

$custom: #303e8b;
$custom-light: #7373ad;
$custom-dark: #000000;

JSON

{
  "hex": "#303e8b",
  "rgb": {
    "r": 48,
    "g": 62,
    "b": 139
  },
  "hsl": {
    "h": 230.769,
    "s": 48.663,
    "l": 36.667
  },
  "oklch": {
    "l": 0.39789,
    "c": 0.12845,
    "h": 271.6
  },
  "luminance": 0.05938
}

Semantic roles & 50–950 ramp

primary

#303E8B

secondary

#B3A764

accent

#C350D8

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#090810

muted

#7B7B7F

Preview Lab

Preview with #303E8B

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

Preview Lab → · Contrast checker → · Palette generator →