#243C8B#243C8B

#243C8B is a dark, vivid blue. Relative luminance 0.055; OKLCH L 38.7% C 0.135 H 267.0°. Best body text is #FFFFFF at 10.03:1 contrast (WCAG AA passes).

Color values

HEX	#243C8B
RGB	rgb(36, 60, 139)
HSL	hsl(226, 59%, 34%)
HSV	hsv(226, 74%, 55%)
CMYK	cmyk(74.1%, 56.8%, 0%, 45.5%)
CIE-LAB	lab(28.03, 19.80, -46.72)
CIE-LCH	lch(28.03, 50.75, 292.97°)
OKLab	oklab(38.69% -0.0069 -0.1346)
OKLCH	oklch(38.69% 0.135 267)
XYZ	xyz(7.0020, 5.4701, 25.1079)
Luminance	0.0547 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243C8B #8B7324

analogous

#24708B #243C8B #3F248B

triadic

#243C8B #8B243C #3C8B24

tetradic

#243C8B #8B2470 #8B7324 #248B3F

square

#243C8B #8B2470 #8B7324 #248B3F

split-complementary

#243C8B #8B3F24 #708B24

monochromatic

#0B122A #17275A #243C8B #3151BC #5673D3

Accessibility & contrast

On white

10.03

#243C8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.09

#243C8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243C8B

10.03:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243C8B	#FFFFFF	#000000	##FFFFFF
##243C8B	1.00	10.03	2.09	10.03
#FFFFFF	10.03	1.00	21.00	1.00
#000000	2.09	21.00	1.00	21.00
##FFFFFF	10.03	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478E

Deuteranopia (green-blind)

#003E89

Tritanopia (blue-blind)

#004F5D

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #243c8b;
/* rgb */ color: rgb(36, 60, 139);
/* oklch */ color: oklch(38.7% 0.135 267.0);

Tailwind

colors: {
  custom: {
    50: '#6e71ad',
    500: '#243c8b',
    950: '#000000',
  },
}

SCSS

$custom: #243c8b;
$custom-light: #6e71ad;
$custom-dark: #000000;

JSON

{
  "hex": "#243c8b",
  "rgb": {
    "r": 36,
    "g": 60,
    "b": 139
  },
  "hsl": {
    "h": 226.019,
    "s": 58.857,
    "l": 34.314
  },
  "oklch": {
    "l": 0.38694,
    "c": 0.13479,
    "h": 267
  },
  "luminance": 0.05471
}

Semantic roles & 50–950 ramp

primary

#243C8B

secondary

#B7A053

accent

#BE46E2

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080710

muted

#7B7A7F

Preview Lab

Preview with #243C8B

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

Preview Lab → · Contrast checker → · Palette generator →