#243FB0#243FB0

#243FB0 is a dark, vivid blue. Relative luminance 0.071; OKLCH L 42.6% C 0.182 H 267.3°. Best body text is #FFFFFF at 8.70:1 contrast (WCAG AA passes).

Color values

HEX	#243FB0
RGB	rgb(36, 63, 176)
HSL	hsl(228, 66%, 42%)
HSV	hsv(228, 80%, 69%)
CMYK	cmyk(79.5%, 64.2%, 0%, 31%)
CIE-LAB	lab(31.95, 31.99, -62.78)
CIE-LCH	lch(31.95, 70.46, 297.00°)
OKLab	oklab(42.58% -0.0086 -0.1817)
OKLCH	oklch(42.58% 0.182 267.3)
XYZ	xyz(10.3388, 7.0635, 41.8844)
Luminance	0.0707 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243FB0 #B09524

analogous

#2485B0 #243FB0 #4F24B0

triadic

#243FB0 #B0243F #3FB024

tetradic

#243FB0 #B02485 #B09524 #24B04F

square

#243FB0 #B02485 #B09524 #24B04F

split-complementary

#243FB0 #B04F24 #85B024

monochromatic

#0F1B4A #1A2D7D #243FB0 #3A59D7 #6D84E1

Accessibility & contrast

On white

8.70

#243FB0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.41

#243FB0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243FB0

8.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243FB0	#FFFFFF	#000000	##FFFFFF
##243FB0	1.00	8.70	2.41	8.70
#FFFFFF	8.70	1.00	21.00	1.00
#000000	2.41	21.00	1.00	21.00
##FFFFFF	8.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0052B4

Deuteranopia (green-blind)

#0045AE

Tritanopia (blue-blind)

#005D71

Achromatopsia (no color)

#4B4B4B

Design tokens & code

CSS

--color: #243fb0;
/* rgb */ color: rgb(36, 63, 176);
/* oklch */ color: oklch(42.6% 0.182 267.3);

Tailwind

colors: {
  custom: {
    50: '#7774c9',
    500: '#243fb0',
    950: '#000000',
  },
}

SCSS

$custom: #243fb0;
$custom-light: #7774c9;
$custom-dark: #000000;

JSON

{
  "hex": "#243fb0",
  "rgb": {
    "r": 36,
    "g": 63,
    "b": 176
  },
  "hsl": {
    "h": 228.429,
    "s": 66.038,
    "l": 41.569
  },
  "oklch": {
    "l": 0.42579,
    "c": 0.18188,
    "h": 267.3
  },
  "luminance": 0.07065
}

Semantic roles & 50–950 ramp

primary

#243FB0

secondary

#C8B568

accent

#C83FE9

background

#F7F7FC

surface

#EEEDF8

border

#C9C8D1

text

#0A0813

muted

#7C7B82

Preview Lab

Preview with #243FB0

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

Preview Lab → · Contrast checker → · Palette generator →