#243F9B#243F9B

#243F9B is a dark, vivid blue. Relative luminance 0.063; OKLCH L 40.7% C 0.154 H 266.8°. Best body text is #FFFFFF at 9.29:1 contrast (WCAG AA passes).

Color values

HEX	#243F9B
RGB	rgb(36, 63, 155)
HSL	hsl(226, 62%, 37%)
HSV	hsv(226, 77%, 61%)
CMYK	cmyk(76.8%, 59.4%, 0%, 39.2%)
CIE-LAB	lab(30.15, 23.98, -53.10)
CIE-LCH	lch(30.15, 58.26, 294.30°)
OKLab	oklab(40.68% -0.0085 -0.1533)
OKLCH	oklch(40.68% 0.154 266.8)
XYZ	xyz(8.4194, 6.2957, 31.7755)
Luminance	0.0630 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243F9B #9B8024

analogous

#247A9B #243F9B #45249B

triadic

#243F9B #9B243F #3F9B24

tetradic

#243F9B #9B247A #9B8024 #249B45

square

#243F9B #9B247A #9B8024 #249B45

split-complementary

#243F9B #9B4524 #7A9B24

monochromatic

#0D1738 #182B69 #243F9B #3053CD #5F7BDA

Accessibility & contrast

On white

9.29

#243F9B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.26

#243F9B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243F9B

9.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243F9B	#FFFFFF	#000000	##FFFFFF
##243F9B	1.00	9.29	2.26	9.29
#FFFFFF	9.29	1.00	21.00	1.00
#000000	2.26	21.00	1.00	21.00
##FFFFFF	9.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#004D9E

Deuteranopia (green-blind)

#004299

Tritanopia (blue-blind)

#005666

Achromatopsia (no color)

#474747

Design tokens & code

CSS

--color: #243f9b;
/* rgb */ color: rgb(36, 63, 155);
/* oklch */ color: oklch(40.7% 0.154 266.8);

Tailwind

colors: {
  custom: {
    50: '#7173b9',
    500: '#243f9b',
    950: '#000000',
  },
}

SCSS

$custom: #243f9b;
$custom-light: #7173b9;
$custom-dark: #000000;

JSON

{
  "hex": "#243f9b",
  "rgb": {
    "r": 36,
    "g": 63,
    "b": 155
  },
  "hsl": {
    "h": 226.387,
    "s": 62.304,
    "l": 37.451
  },
  "oklch": {
    "l": 0.40681,
    "c": 0.15353,
    "h": 266.8
  },
  "luminance": 0.06297
}

Semantic roles & 50–950 ramp

primary

#243F9B

secondary

#BFA85C

accent

#C042E5

background

#F7F6FB

surface

#EDECF6

border

#C8C7D0

text

#090812

muted

#7B7B81

Preview Lab

Preview with #243F9B

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

Preview Lab → · Contrast checker → · Palette generator →