#243A8F#243A8F

#243A8F is a dark, vivid blue. Relative luminance 0.054; OKLCH L 38.6% C 0.143 H 267.9°. Best body text is #FFFFFF at 10.11:1 contrast (WCAG AA passes).

Color values

HEX	#243A8F
RGB	rgb(36, 58, 143)
HSL	hsl(228, 60%, 35%)
HSV	hsv(228, 75%, 56%)
CMYK	cmyk(74.8%, 59.4%, 0%, 43.9%)
CIE-LAB	lab(27.80, 22.73, -49.57)
CIE-LCH	lch(27.80, 54.54, 294.63°)
OKLab	oklab(38.62% -0.0051 -0.143)
OKLCH	oklch(38.62% 0.143 267.9)
XYZ	xyz(7.1968, 5.3836, 26.6411)
Luminance	0.0538 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243A8F #8F7924

analogous

#246F8F #243A8F #44248F

triadic

#243A8F #8F243A #3A8F24

tetradic

#243A8F #8F246F #8F7924 #248F44

square

#243A8F #8F246F #8F7924 #248F44

split-complementary

#243A8F #8F4424 #6F8F24

monochromatic

#0B122D #18265E #243A8F #304EC0 #5872D5

Accessibility & contrast

On white

10.11

#243A8F on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.08

#243A8F on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243A8F

10.11:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243A8F	#FFFFFF	#000000	##FFFFFF
##243A8F	1.00	10.11	2.08	10.11
#FFFFFF	10.11	1.00	21.00	1.00
#000000	2.08	21.00	1.00	21.00
##FFFFFF	10.11	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004792

Deuteranopia (green-blind)

#003D8D

Tritanopia (blue-blind)

#004F5E

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #243a8f;
/* rgb */ color: rgb(36, 58, 143);
/* oklch */ color: oklch(38.6% 0.143 267.9);

Tailwind

colors: {
  custom: {
    50: '#6f6fb0',
    500: '#243a8f',
    950: '#000000',
  },
}

SCSS

$custom: #243a8f;
$custom-light: #6f6fb0;
$custom-dark: #000000;

JSON

{
  "hex": "#243a8f",
  "rgb": {
    "r": 36,
    "g": 58,
    "b": 143
  },
  "hsl": {
    "h": 227.664,
    "s": 59.777,
    "l": 35.098
  },
  "oklch": {
    "l": 0.3862,
    "c": 0.1431,
    "h": 267.9
  },
  "luminance": 0.05384
}

Semantic roles & 50–950 ramp

primary

#243A8F

secondary

#B9A555

accent

#C245E3

background

#F7F6FA

surface

#EDECF5

border

#C8C7CF

text

#080711

muted

#7B7A80

Preview Lab

Preview with #243A8F

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

Preview Lab → · Contrast checker → · Palette generator →