#4243FF#4243FF

#4243FF is a mid, highly saturated blue. Relative luminance 0.124; OKLCH L 52.4% C 0.266 H 272.2°. Best body text is #FFFFFF at 6.04:1 contrast (WCAG AA passes).

Color values

HEX	#4243FF
RGB	rgb(66, 67, 255)
HSL	hsl(240, 100%, 63%)
HSV	hsv(240, 74%, 100%)
CMYK	cmyk(74.1%, 73.7%, 0%, 0%)
CIE-LAB	lab(41.83, 59.11, -91.94)
CIE-LCH	lch(41.83, 109.30, 302.74°)
OKLab	oklab(52.37% 0.0101 -0.2661)
OKLCH	oklch(52.37% 0.266 272.2)
XYZ	xyz(22.2978, 12.3902, 95.8047)
Luminance	0.1239 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4243FF #FFFE42

analogous

#42A1FF #4243FF #A042FF

triadic

#4243FF #FF4243 #43FF42

tetradic

#4243FF #FF42A1 #FFFE42 #42FFA0

square

#4243FF #FF42A1 #FFFE42 #42FFA0

split-complementary

#4243FF #FFA042 #A1FF42

monochromatic

#0001C7 #0506FF #4243FF #7F80FF #BCBDFF

Accessibility & contrast

On white

6.04

#4243FF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.48

#4243FF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4243FF

6.04:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4243FF	#FFFFFF	#000000	##FFFFFF
##4243FF	1.00	6.04	3.48	6.04
#FFFFFF	6.04	1.00	21.00	1.00
#000000	3.48	21.00	1.00	21.00
##FFFFFF	6.04	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#006CFF

Deuteranopia (green-blind)

#0059FC

Tritanopia (blue-blind)

#007A9E

Achromatopsia (no color)

#636363

Design tokens & code

CSS

--color: #4243ff;
/* rgb */ color: rgb(66, 67, 255);
/* oklch */ color: oklch(52.4% 0.266 272.2);

Tailwind

colors: {
  custom: {
    50: '#937aff',
    500: '#4243ff',
    950: '#000000',
  },
}

SCSS

$custom: #4243ff;
$custom-light: #937aff;
$custom-dark: #000000;

JSON

{
  "hex": "#4243ff",
  "rgb": {
    "r": 66,
    "g": 67,
    "b": 255
  },
  "hsl": {
    "h": 239.683,
    "s": 100,
    "l": 62.941
  },
  "oklch": {
    "l": 0.52371,
    "c": 0.26632,
    "h": 272.2
  },
  "luminance": 0.12393
}

Semantic roles & 50–950 ramp

primary

#4243FF

secondary

#F0F0AC

accent

#E400E6

background

#FAF7FF

surface

#F4EEFF

border

#CEC9D7

text

#0F0918

muted

#7F7B86

Preview Lab

Preview with #4243FF

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

Preview Lab → · Contrast checker → · Palette generator →