#243FBC#243FBC

#243FBC is a dark, vivid blue. Relative luminance 0.076; OKLCH L 43.7% C 0.197 H 267.4°. Best body text is #FFFFFF at 8.36:1 contrast (WCAG AA passes).

Color values

HEX	#243FBC
RGB	rgb(36, 63, 188)
HSL	hsl(229, 68%, 44%)
HSV	hsv(229, 81%, 74%)
CMYK	cmyk(80.9%, 66.5%, 0%, 26.3%)
CIE-LAB	lab(33.05, 36.45, -68.09)
CIE-LCH	lch(33.05, 77.23, 298.16°)
OKLab	oklab(43.72% -0.0091 -0.1972)
OKLCH	oklch(43.72% 0.197 267.4)
XYZ	xyz(11.5790, 7.5596, 48.4161)
Luminance	0.0756 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

#533CC6

ΔE00 5.96

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243FBC #BCA124

analogous

#248BBC #243FBC #5524BC

triadic

#243FBC #BC243F #3FBC24

tetradic

#243FBC #BC248B #BCA124 #24BC55

square

#243FBC #BC248B #BCA124 #24BC55

split-complementary

#243FBC #BC5524 #8BBC24

monochromatic

#101D55 #1A2E89 #243FBC #425DDB #7689E5

Accessibility & contrast

On white

8.36

#243FBC on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.51

#243FBC on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243FBC

8.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243FBC	#FFFFFF	#000000	##FFFFFF
##243FBC	1.00	8.36	2.51	8.36
#FFFFFF	8.36	1.00	21.00	1.00
#000000	2.51	21.00	1.00	21.00
##FFFFFF	8.36	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0055C0

Deuteranopia (green-blind)

#0047BA

Tritanopia (blue-blind)

#006178

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #243fbc;
/* rgb */ color: rgb(36, 63, 188);
/* oklch */ color: oklch(43.7% 0.197 267.4);

Tailwind

colors: {
  custom: {
    50: '#7a74d1',
    500: '#243fbc',
    950: '#000000',
  },
}

SCSS

$custom: #243fbc;
$custom-light: #7a74d1;
$custom-dark: #000000;

JSON

{
  "hex": "#243fbc",
  "rgb": {
    "r": 36,
    "g": 63,
    "b": 188
  },
  "hsl": {
    "h": 229.342,
    "s": 67.857,
    "l": 43.922
  },
  "oklch": {
    "l": 0.4372,
    "c": 0.19741,
    "h": 267.4
  },
  "luminance": 0.07561
}

Semantic roles & 50–950 ramp

primary

#243FBC

secondary

#CCBC70

accent

#CC3DEB

background

#F8F7FD

surface

#EFEDFA

border

#CAC8D3

text

#0B0814

muted

#7C7B83

Preview Lab

Preview with #243FBC

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

Preview Lab → · Contrast checker → · Palette generator →