#243CA8#243CA8

#243CA8 is a dark, vivid blue. Relative luminance 0.064; OKLCH L 41.3% C 0.175 H 267.8°. Best body text is #FFFFFF at 9.18:1 contrast (WCAG AA passes).

Color values

HEX	#243CA8
RGB	rgb(36, 60, 168)
HSL	hsl(229, 65%, 40%)
HSV	hsv(229, 79%, 66%)
CMYK	cmyk(78.6%, 64.3%, 0%, 34.1%)
CIE-LAB	lab(30.48, 30.95, -60.41)
CIE-LCH	lch(30.48, 67.88, 297.13°)
OKLab	oklab(41.28% -0.0066 -0.1748)
OKLCH	oklch(41.28% 0.175 267.8)
XYZ	xyz(9.4088, 6.4329, 37.7840)
Luminance	0.0643 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243CA8 #A89024

analogous

#247EA8 #243CA8 #4E24A8

triadic

#243CA8 #A8243C #3CA824

tetradic

#243CA8 #A8247E #A89024 #24A84E

square

#243CA8 #A8247E #A89024 #24A84E

split-complementary

#243CA8 #A84E24 #7EA824

monochromatic

#0E1843 #192A76 #243CA8 #3552D4 #687DDF

Accessibility & contrast

On white

9.18

#243CA8 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.29

#243CA8 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243CA8

9.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243CA8	#FFFFFF	#000000	##FFFFFF
##243CA8	1.00	9.18	2.29	9.18
#FFFFFF	9.18	1.00	21.00	1.00
#000000	2.29	21.00	1.00	21.00
##FFFFFF	9.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004EAB

Deuteranopia (green-blind)

#0042A6

Tritanopia (blue-blind)

#00586C

Achromatopsia (no color)

#484848

Design tokens & code

CSS

--color: #243ca8;
/* rgb */ color: rgb(36, 60, 168);
/* oklch */ color: oklch(41.3% 0.175 267.8);

Tailwind

colors: {
  custom: {
    50: '#7571c3',
    500: '#243ca8',
    950: '#000000',
  },
}

SCSS

$custom: #243ca8;
$custom-light: #7571c3;
$custom-dark: #000000;

JSON

{
  "hex": "#243ca8",
  "rgb": {
    "r": 36,
    "g": 60,
    "b": 168
  },
  "hsl": {
    "h": 229.091,
    "s": 64.706,
    "l": 40
  },
  "oklch": {
    "l": 0.41275,
    "c": 0.17488,
    "h": 267.8
  },
  "luminance": 0.06434
}

Semantic roles & 50–950 ramp

primary

#243CA8

secondary

#C4B363

accent

#C940E8

background

#F7F6FC

surface

#EEECF8

border

#C9C7D1

text

#0A0713

muted

#7C7A82

Preview Lab

Preview with #243CA8

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

Preview Lab → · Contrast checker → · Palette generator →