#243B81#243B81

#243B81 is a dark, vivid blue. Relative luminance 0.051; OKLCH L 37.7% C 0.122 H 266.8°. Best body text is #FFFFFF at 10.41:1 contrast (WCAG AA passes).

Color values

HEX	#243B81
RGB	rgb(36, 59, 129)
HSL	hsl(225, 56%, 32%)
HSV	hsv(225, 72%, 51%)
CMYK	cmyk(72.1%, 54.3%, 0%, 49.4%)
CIE-LAB	lab(26.98, 16.57, -42.21)
CIE-LCH	lch(26.98, 45.34, 291.44°)
OKLab	oklab(37.66% -0.0069 -0.1213)
OKLCH	oklch(37.66% 0.122 266.8)
XYZ	xyz(6.2526, 5.0873, 21.4171)
Luminance	0.0509 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243B81 #816A24

analogous

#246A81 #243B81 #3B2481

triadic

#243B81 #81243B #3B8124

tetradic

#243B81 #81246A #816A24 #24813B

square

#243B81 #81246A #816A24 #24813B

split-complementary

#243B81 #813B24 #6A8124

monochromatic

#090F21 #172551 #243B81 #3151B1 #5170CE

Accessibility & contrast

On white

10.41

#243B81 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.02

#243B81 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243B81

10.41:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243B81	#FFFFFF	#000000	##FFFFFF
##243B81	1.00	10.41	2.02	10.41
#FFFFFF	10.41	1.00	21.00	1.00
#000000	2.02	21.00	1.00	21.00
##FFFFFF	10.41	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0C4483

Deuteranopia (green-blind)

#003C80

Tritanopia (blue-blind)

#004C58

Achromatopsia (no color)

#404040

Design tokens & code

CSS

--color: #243b81;
/* rgb */ color: rgb(36, 59, 129);
/* oklch */ color: oklch(37.7% 0.122 266.8);

Tailwind

colors: {
  custom: {
    50: '#6b70a6',
    500: '#243b81',
    950: '#000000',
  },
}

SCSS

$custom: #243b81;
$custom-light: #6b70a6;
$custom-dark: #000000;

JSON

{
  "hex": "#243b81",
  "rgb": {
    "r": 36,
    "g": 59,
    "b": 129
  },
  "hsl": {
    "h": 225.161,
    "s": 56.364,
    "l": 32.353
  },
  "oklch": {
    "l": 0.37657,
    "c": 0.12152,
    "h": 266.8
  },
  "luminance": 0.05088
}

Semantic roles & 50–950 ramp

primary

#243B81

secondary

#B29A4E

accent

#BA48E0

background

#F6F6FA

surface

#ECECF4

border

#C7C7CE

text

#07070F

muted

#7A7A7F

Preview Lab

Preview with #243B81

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

Preview Lab → · Contrast checker → · Palette generator →