#243F8A#243F8A

#243F8A is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.3% C 0.129 H 265.7°. Best body text is #FFFFFF at 9.75:1 contrast (WCAG AA passes).

Color values

HEX	#243F8A
RGB	rgb(36, 63, 138)
HSL	hsl(224, 59%, 34%)
HSV	hsv(224, 74%, 54%)
CMYK	cmyk(73.9%, 54.3%, 0%, 45.9%)
CIE-LAB	lab(28.81, 17.34, -44.85)
CIE-LCH	lch(28.81, 48.08, 291.14°)
OKLab	oklab(39.26% -0.0096 -0.129)
OKLCH	oklch(39.26% 0.129 265.7)
XYZ	xyz(7.0909, 5.7643, 24.7787)
Luminance	0.0576 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243F8A #8A6F24

analogous

#24728A #243F8A #3C248A

triadic

#243F8A #8A243F #3F8A24

tetradic

#243F8A #8A2472 #8A6F24 #248A3C

square

#243F8A #8A2472 #8A6F24 #248A3C

split-complementary

#243F8A #8A3C24 #728A24

monochromatic

#0B1329 #172959 #243F8A #3155BB #5677D3

Accessibility & contrast

On white

9.75

#243F8A on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.15

#243F8A on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243F8A

9.75:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243F8A	#FFFFFF	#000000	##FFFFFF
##243F8A	1.00	9.75	2.15	9.75
#FFFFFF	9.75	1.00	21.00	1.00
#000000	2.15	21.00	1.00	21.00
##FFFFFF	9.75	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0A498D

Deuteranopia (green-blind)

#003F88

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #243f8a;
/* rgb */ color: rgb(36, 63, 138);
/* oklch */ color: oklch(39.3% 0.129 265.7);

Tailwind

colors: {
  custom: {
    50: '#6d73ad',
    500: '#243f8a',
    950: '#000000',
  },
}

SCSS

$custom: #243f8a;
$custom-light: #6d73ad;
$custom-dark: #000000;

JSON

{
  "hex": "#243f8a",
  "rgb": {
    "r": 36,
    "g": 63,
    "b": 138
  },
  "hsl": {
    "h": 224.118,
    "s": 58.621,
    "l": 34.118
  },
  "oklch": {
    "l": 0.39255,
    "c": 0.1294,
    "h": 265.7
  },
  "luminance": 0.05765
}

Semantic roles & 50–950 ramp

primary

#243F8A

secondary

#B79C53

accent

#B946E2

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080810

muted

#7B7B7F

Preview Lab

Preview with #243F8A

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

Preview Lab → · Contrast checker → · Palette generator →