#243FB1#243FB1

#243FB1 is a dark, vivid blue. Relative luminance 0.071; OKLCH L 42.7% C 0.183 H 267.3°. Best body text is #FFFFFF at 8.67:1 contrast (WCAG AA passes).

Color values

HEX	#243FB1
RGB	rgb(36, 63, 177)
HSL	hsl(229, 66%, 42%)
HSV	hsv(229, 80%, 69%)
CMYK	cmyk(79.7%, 64.4%, 0%, 30.6%)
CIE-LAB	lab(32.04, 32.37, -63.23)
CIE-LCH	lch(32.04, 71.03, 297.11°)
OKLab	oklab(42.67% -0.0086 -0.183)
OKLCH	oklch(42.67% 0.183 267.3)
XYZ	xyz(10.4381, 7.1032, 42.4074)
Luminance	0.0710 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243FB1 #B19624

analogous

#2486B1 #243FB1 #5024B1

triadic

#243FB1 #B1243F #3FB124

tetradic

#243FB1 #B12486 #B19624 #24B150

square

#243FB1 #B12486 #B19624 #24B150

split-complementary

#243FB1 #B15024 #86B124

monochromatic

#0F1B4B #1A2D7E #243FB1 #3B59D7 #6E84E1

Accessibility & contrast

On white

8.67

#243FB1 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.42

#243FB1 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243FB1

8.67:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243FB1	#FFFFFF	#000000	##FFFFFF
##243FB1	1.00	8.67	2.42	8.67
#FFFFFF	8.67	1.00	21.00	1.00
#000000	2.42	21.00	1.00	21.00
##FFFFFF	8.67	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052B5

Deuteranopia (green-blind)

#0045AF

Tritanopia (blue-blind)

#005D72

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #243fb1;
/* rgb */ color: rgb(36, 63, 177);
/* oklch */ color: oklch(42.7% 0.183 267.3);

Tailwind

colors: {
  custom: {
    50: '#7774c9',
    500: '#243fb1',
    950: '#000000',
  },
}

SCSS

$custom: #243fb1;
$custom-light: #7774c9;
$custom-dark: #000000;

JSON

{
  "hex": "#243fb1",
  "rgb": {
    "r": 36,
    "g": 63,
    "b": 177
  },
  "hsl": {
    "h": 228.511,
    "s": 66.197,
    "l": 41.765
  },
  "oklch": {
    "l": 0.42673,
    "c": 0.18319,
    "h": 267.3
  },
  "luminance": 0.07104
}

Semantic roles & 50–950 ramp

primary

#243FB1

secondary

#C8B669

accent

#C83FE9

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #243FB1

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

Preview Lab → · Contrast checker → · Palette generator →