#243D5B#243D5B

#243D5B is a dark, moderate cyan. Relative luminance 0.045; OKLCH L 35.5% C 0.061 H 253.8°. Best body text is #FFFFFF at 11.09:1 contrast (WCAG AA passes).

Color values

HEX	#243D5B
RGB	rgb(36, 61, 91)
HSL	hsl(213, 43%, 25%)
HSV	hsv(213, 60%, 36%)
CMYK	cmyk(60.4%, 33%, 0%, 64.3%)
CIE-LAB	lab(25.16, 0.52, -20.84)
CIE-LCH	lch(25.16, 20.85, 271.44°)
OKLab	oklab(35.47% -0.017 -0.0587)
OKLCH	oklch(35.47% 0.061 253.8)
XYZ	xyz(4.2840, 4.4675, 10.5321)
Luminance	0.0447 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243D5B #5B4224

analogous

#24595B #243D5B #26245B

triadic

#243D5B #5B243D #3D5B24

tetradic

#243D5B #5B2459 #5B4224 #245B26

square

#243D5B #5B2459 #5B4224 #245B26

split-complementary

#243D5B #5B2624 #595B24

monochromatic

#090F16 #13202F #243D5B #355A87 #4778B3

Accessibility & contrast

On white

11.09

#243D5B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#243D5B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243D5B

11.09:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243D5B	#FFFFFF	#000000	##FFFFFF
##243D5B	1.00	11.09	1.89	11.09
#FFFFFF	11.09	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.09	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#313F5C

Deuteranopia (green-blind)

#2A395A

Tritanopia (blue-blind)

#004448

Achromatopsia (no color)

#3C3C3C

Design tokens & code

CSS

--color: #243d5b;
/* rgb */ color: rgb(36, 61, 91);
/* oklch */ color: oklch(35.5% 0.061 253.8);

Tailwind

colors: {
  custom: {
    50: '#647289',
    500: '#243d5b',
    950: '#000000',
  },
}

SCSS

$custom: #243d5b;
$custom-light: #647289;
$custom-dark: #000000;

JSON

{
  "hex": "#243d5b",
  "rgb": {
    "r": 36,
    "g": 61,
    "b": 91
  },
  "hsl": {
    "h": 212.727,
    "s": 43.307,
    "l": 24.902
  },
  "oklch": {
    "l": 0.35467,
    "c": 0.0611,
    "h": 253.8
  },
  "luminance": 0.04468
}

Semantic roles & 50–950 ramp

primary

#243D5B

secondary

#8F704C

accent

#9A55D3

background

#F6F6F8

surface

#EBECF0

border

#C6C7CB

text

#06070B

muted

#7A7A7C

Preview Lab

Preview with #243D5B

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

Preview Lab → · Contrast checker → · Palette generator →