#4243BB#4243BB

#4243BB is a mid, vivid blue. Relative luminance 0.088; OKLCH L 45.9% C 0.184 H 276.0°. Best body text is #FFFFFF at 7.63:1 contrast (WCAG AA passes).

Color values

HEX	#4243BB
RGB	rgb(66, 67, 187)
HSL	hsl(240, 48%, 50%)
HSV	hsv(240, 65%, 73%)
CMYK	cmyk(64.7%, 64.2%, 0%, 26.7%)
CIE-LAB	lab(35.52, 37.01, -63.39)
CIE-LCH	lch(35.52, 73.40, 300.28°)
OKLab	oklab(45.93% 0.0193 -0.1827)
OKLCH	oklch(45.93% 0.184 276)
XYZ	xyz(13.2206, 8.7593, 47.9981)
Luminance	0.0876 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4243BB #BBBA42

analogous

#4280BB #4243BB #7E42BB

triadic

#4243BB #BB4243 #43BB42

tetradic

#4243BB #BB4280 #BBBA42 #42BB7E

square

#4243BB #BB4280 #BBBA42 #42BB7E

split-complementary

#4243BB #BB7E42 #80BB42

monochromatic

#222361 #32338E #4243BB #6E6FCC #9C9CDC

Accessibility & contrast

On white

7.63

#4243BB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.75

#4243BB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #4243BB

7.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4243BB	#FFFFFF	#000000	##FFFFFF
##4243BB	1.00	7.63	2.75	7.63
#FFFFFF	7.63	1.00	21.00	1.00
#000000	2.75	21.00	1.00	21.00
##FFFFFF	7.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0059BF

Deuteranopia (green-blind)

#004EB9

Tritanopia (blue-blind)

#006279

Achromatopsia (no color)

#545454

Design tokens & code

CSS

--color: #4243bb;
/* rgb */ color: rgb(66, 67, 187);
/* oklch */ color: oklch(45.9% 0.184 276.0);

Tailwind

colors: {
  custom: {
    50: '#8477d0',
    500: '#4243bb',
    950: '#000000',
  },
}

SCSS

$custom: #4243bb;
$custom-light: #8477d0;
$custom-dark: #000000;

JSON

{
  "hex": "#4243bb",
  "rgb": {
    "r": 66,
    "g": 67,
    "b": 187
  },
  "hsl": {
    "h": 239.504,
    "s": 47.826,
    "l": 49.608
  },
  "oklch": {
    "l": 0.4593,
    "c": 0.18376,
    "h": 276
  },
  "luminance": 0.0876
}

Semantic roles & 50–950 ramp

primary

#4243BB

secondary

#C8C891

accent

#D650D7

background

#F8F7FC

surface

#F0EDF9

border

#CBC8D2

text

#0C0914

muted

#7D7B82

Preview Lab

Preview with #4243BB

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

Preview Lab → · Contrast checker → · Palette generator →