#243FB3#243FB3

#243FB3 is a dark, vivid blue. Relative luminance 0.072; OKLCH L 42.9% C 0.186 H 267.3°. Best body text is #FFFFFF at 8.62:1 contrast (WCAG AA passes).

Color values

HEX	#243FB3
RGB	rgb(36, 63, 179)
HSL	hsl(229, 67%, 42%)
HSV	hsv(229, 80%, 70%)
CMYK	cmyk(79.9%, 64.8%, 0%, 29.8%)
CIE-LAB	lab(32.22, 33.12, -64.12)
CIE-LCH	lch(32.22, 72.17, 297.31°)
OKLab	oklab(42.86% -0.0087 -0.1856)
OKLCH	oklch(42.86% 0.186 267.3)
XYZ	xyz(10.6389, 7.1835, 43.4649)
Luminance	0.0718 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243FB3 #B39824

analogous

#2487B3 #243FB3 #5024B3

triadic

#243FB3 #B3243F #3FB324

tetradic

#243FB3 #B32487 #B39824 #24B350

square

#243FB3 #B32487 #B39824 #24B350

split-complementary

#243FB3 #B35024 #87B324

monochromatic

#101B4D #1A2D80 #243FB3 #3C5AD8 #6F85E2

Accessibility & contrast

On white

8.62

#243FB3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.44

#243FB3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243FB3

8.62:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243FB3	#FFFFFF	#000000	##FFFFFF
##243FB3	1.00	8.62	2.44	8.62
#FFFFFF	8.62	1.00	21.00	1.00
#000000	2.44	21.00	1.00	21.00
##FFFFFF	8.62	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0053B7

Deuteranopia (green-blind)

#0045B1

Tritanopia (blue-blind)

#005E73

Achromatopsia (no color)

#4C4C4C

Design tokens & code

CSS

--color: #243fb3;
/* rgb */ color: rgb(36, 63, 179);
/* oklch */ color: oklch(42.9% 0.186 267.3);

Tailwind

colors: {
  custom: {
    50: '#7774cb',
    500: '#243fb3',
    950: '#000000',
  },
}

SCSS

$custom: #243fb3;
$custom-light: #7774cb;
$custom-dark: #000000;

JSON

{
  "hex": "#243fb3",
  "rgb": {
    "r": 36,
    "g": 63,
    "b": 179
  },
  "hsl": {
    "h": 228.671,
    "s": 66.512,
    "l": 42.157
  },
  "oklch": {
    "l": 0.42861,
    "c": 0.18581,
    "h": 267.3
  },
  "luminance": 0.07185
}

Semantic roles & 50–950 ramp

primary

#243FB3

secondary

#C9B76A

accent

#C93EE9

background

#F8F7FC

surface

#EFEDF9

border

#CAC8D2

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #243FB3

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

Preview Lab → · Contrast checker → · Palette generator →