#4243EF#4243EF

#4243EF is a mid, highly saturated blue. Relative luminance 0.114; OKLCH L 50.8% C 0.248 H 272.9°. Best body text is #FFFFFF at 6.40:1 contrast (WCAG AA passes).

Color values

HEX	#4243EF
RGB	rgb(66, 67, 239)
HSL	hsl(240, 84%, 60%)
HSV	hsv(240, 72%, 94%)
CMYK	cmyk(72.4%, 72%, 0%, 6.3%)
CIE-LAB	lab(40.25, 54.09, -85.57)
CIE-LCH	lch(40.25, 101.23, 302.30°)
OKLab	oklab(50.78% 0.0127 -0.2476)
OKLCH	oklch(50.78% 0.248 272.9)
XYZ	xyz(19.8287, 11.4025, 82.8005)
Luminance	0.1140 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#4243EF #EFEE42

analogous

#429AEF #4243EF #9742EF

triadic

#4243EF #EF4243 #43EF42

tetradic

#4243EF #EF429A #EFEE42 #42EF97

square

#4243EF #EF429A #EFEE42 #42EF97

split-complementary

#4243EF #EF9742 #9AEF42

monochromatic

#0E0FA8 #1314E1 #4243EF #7A7BF4 #B3B3F9

Accessibility & contrast

On white

6.40

#4243EF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.28

#4243EF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #4243EF

6.40:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4243EF	#FFFFFF	#000000	##FFFFFF
##4243EF	1.00	6.40	3.28	6.40
#FFFFFF	6.40	1.00	21.00	1.00
#000000	3.28	21.00	1.00	21.00
##FFFFFF	6.40	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0067F4

Deuteranopia (green-blind)

#0056EC

Tritanopia (blue-blind)

#007495

Achromatopsia (no color)

#5F5F5F

Design tokens & code

CSS

--color: #4243ef;
/* rgb */ color: rgb(66, 67, 239);
/* oklch */ color: oklch(50.8% 0.248 272.9);

Tailwind

colors: {
  custom: {
    50: '#8f79f6',
    500: '#4243ef',
    950: '#000000',
  },
}

SCSS

$custom: #4243ef;
$custom-light: #8f79f6;
$custom-dark: #000000;

JSON

{
  "hex": "#4243ef",
  "rgb": {
    "r": 66,
    "g": 67,
    "b": 239
  },
  "hsl": {
    "h": 239.653,
    "s": 84.39,
    "l": 59.804
  },
  "oklch": {
    "l": 0.5078,
    "c": 0.24791,
    "h": 272.9
  },
  "luminance": 0.11405
}

Semantic roles & 50–950 ramp

primary

#4243EF

secondary

#E8E7A5

accent

#F92DFB

background

#F9F7FF

surface

#F2EDFF

border

#CCC8D7

text

#0F0917

muted

#7E7B85

Preview Lab

Preview with #4243EF

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

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