#243F8C#243F8C

#243F8C is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.4% C 0.132 H 265.9°. Best body text is #FFFFFF at 9.70:1 contrast (WCAG AA passes).

Color values

HEX	#243F8C
RGB	rgb(36, 63, 140)
HSL	hsl(224, 59%, 35%)
HSV	hsv(224, 74%, 55%)
CMYK	cmyk(74.3%, 55%, 0%, 45.1%)
CIE-LAB	lab(28.96, 18.13, -45.84)
CIE-LCH	lch(28.96, 49.29, 291.57°)
OKLab	oklab(39.42% -0.0094 -0.132)
OKLCH	oklch(39.42% 0.132 265.9)
XYZ	xyz(7.2370, 5.8228, 25.5484)
Luminance	0.0582 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#243F8C #8C7124

analogous

#24738C #243F8C #3D248C

triadic

#243F8C #8C243F #3F8C24

tetradic

#243F8C #8C2473 #8C7124 #248C3D

square

#243F8C #8C2473 #8C7124 #248C3D

split-complementary

#243F8C #8C3D24 #738C24

monochromatic

#0B132B #17295B #243F8C #3155BD #5777D4

Accessibility & contrast

On white

9.70

#243F8C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#243F8C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #243F8C

9.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##243F8C	#FFFFFF	#000000	##FFFFFF
##243F8C	1.00	9.70	2.16	9.70
#FFFFFF	9.70	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#04498F

Deuteranopia (green-blind)

#00408A

Tritanopia (blue-blind)

#00525F

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #243f8c;
/* rgb */ color: rgb(36, 63, 140);
/* oklch */ color: oklch(39.4% 0.132 265.9);

Tailwind

colors: {
  custom: {
    50: '#6e73ae',
    500: '#243f8c',
    950: '#000000',
  },
}

SCSS

$custom: #243f8c;
$custom-light: #6e73ae;
$custom-dark: #000000;

JSON

{
  "hex": "#243f8c",
  "rgb": {
    "r": 36,
    "g": 63,
    "b": 140
  },
  "hsl": {
    "h": 224.423,
    "s": 59.091,
    "l": 34.51
  },
  "oklch": {
    "l": 0.39417,
    "c": 0.13229,
    "h": 265.9
  },
  "luminance": 0.05824
}

Semantic roles & 50–950 ramp

primary

#243F8C

secondary

#B89E54

accent

#BA46E2

background

#F7F6FA

surface

#EDECF4

border

#C8C7CE

text

#080810

muted

#7B7B7F

Preview Lab

Preview with #243F8C

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

Preview Lab → · Contrast checker → · Palette generator →