#243F8B#243F8B

#243F8B is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.3% C 0.131 H 265.8°. Best body text is #FFFFFF at 9.73:1 contrast (WCAG AA passes).

Color values

HEX	#243F8B
RGB	rgb(36, 63, 139)
HSL	hsl(224, 59%, 34%)
HSV	hsv(224, 74%, 55%)
CMYK	cmyk(74.1%, 54.7%, 0%, 45.5%)
CIE-LAB	lab(28.89, 17.73, -45.34)
CIE-LCH	lch(28.89, 48.69, 291.36°)
OKLab	oklab(39.34% -0.0095 -0.1305)
OKLCH	oklch(39.34% 0.131 265.8)
XYZ	xyz(7.1636, 5.7934, 25.1618)
Luminance	0.0579 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243F8B #8B7024

analogous

#24738B #243F8B #3D248B

triadic

#243F8B #8B243F #3F8B24

tetradic

#243F8B #8B2473 #8B7024 #248B3D

square

#243F8B #8B2473 #8B7024 #248B3D

split-complementary

#243F8B #8B3D24 #738B24

monochromatic

#0B132A #17295A #243F8B #3155BC #5677D3

Accessibility & contrast

On white

9.73

#243F8B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#243F8B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243F8B

9.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243F8B	#FFFFFF	#000000	##FFFFFF
##243F8B	1.00	9.73	2.16	9.73
#FFFFFF	9.73	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#07498E

Deuteranopia (green-blind)

#004089

Tritanopia (blue-blind)

#00515E

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #243f8b;
/* rgb */ color: rgb(36, 63, 139);
/* oklch */ color: oklch(39.3% 0.131 265.8);

Tailwind

colors: {
  custom: {
    50: '#6d73ad',
    500: '#243f8b',
    950: '#000000',
  },
}

SCSS

$custom: #243f8b;
$custom-light: #6d73ad;
$custom-dark: #000000;

JSON

{
  "hex": "#243f8b",
  "rgb": {
    "r": 36,
    "g": 63,
    "b": 139
  },
  "hsl": {
    "h": 224.272,
    "s": 58.857,
    "l": 34.314
  },
  "oklch": {
    "l": 0.39336,
    "c": 0.13085,
    "h": 265.8
  },
  "luminance": 0.05794
}

Semantic roles & 50–950 ramp

primary

#243F8B

secondary

#B79D53

accent

#B946E2

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080810

muted

#7B7B7F

Preview Lab

Preview with #243F8B

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

Preview Lab → · Contrast checker → · Palette generator →