#4243D9#4243D9

#4243D9 is a mid, highly saturated blue. Relative luminance 0.102; OKLCH L 48.7% C 0.222 H 274.1°. Best body text is #FFFFFF at 6.92:1 contrast (WCAG AA passes).

Color values

HEX	#4243D9
RGB	rgb(66, 67, 217)
HSL	hsl(240, 67%, 55%)
HSV	hsv(240, 70%, 85%)
CMYK	cmyk(69.6%, 69.1%, 0%, 14.9%)
CIE-LAB	lab(38.16, 46.99, -76.48)
CIE-LCH	lch(38.16, 89.76, 301.57°)
OKLab	oklab(48.66% 0.016 -0.2211)
OKLCH	oklch(48.66% 0.222 274.1)
XYZ	xyz(16.7741, 10.1807, 66.7133)
Luminance	0.1018 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Blue (survey)

#0343DF

ΔE00 3.39

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4243D9 #D9D842

analogous

#428ED9 #4243D9 #8D42D9

triadic

#4243D9 #D94243 #43D942

tetradic

#4243D9 #D9428E #D9D842 #42D98D

square

#4243D9 #D9428E #D9D842 #42D98D

split-complementary

#4243D9 #D98D42 #8ED942

monochromatic

#1B1C86 #2526B9 #4243D9 #7576E3 #A8A8ED

Accessibility & contrast

On white

6.92

#4243D9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.04

#4243D9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4243D9

6.92:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4243D9	#FFFFFF	#000000	##FFFFFF
##4243D9	1.00	6.92	3.04	6.92
#FFFFFF	6.92	1.00	21.00	1.00
#000000	3.04	21.00	1.00	21.00
##FFFFFF	6.92	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0061DE

Deuteranopia (green-blind)

#0053D6

Tritanopia (blue-blind)

#006C89

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #4243d9;
/* rgb */ color: rgb(66, 67, 217);
/* oklch */ color: oklch(48.7% 0.222 274.1);

Tailwind

colors: {
  custom: {
    50: '#8b78e6',
    500: '#4243d9',
    950: '#000000',
  },
}

SCSS

$custom: #4243d9;
$custom-light: #8b78e6;
$custom-dark: #000000;

JSON

{
  "hex": "#4243d9",
  "rgb": {
    "r": 66,
    "g": 67,
    "b": 217
  },
  "hsl": {
    "h": 239.603,
    "s": 66.52,
    "l": 55.49
  },
  "oklch": {
    "l": 0.4866,
    "c": 0.22166,
    "h": 274.1
  },
  "luminance": 0.10182
}

Semantic roles & 50–950 ramp

primary

#4243D9

secondary

#DBDA9C

accent

#E83EE9

background

#F9F7FE

surface

#F2EDFD

border

#CCC8D5

text

#0E0916

muted

#7E7B84

Preview Lab

Preview with #4243D9

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

Preview Lab → · Contrast checker → · Palette generator →