#4243CB#4243CB

#4243CB is a mid, highly saturated blue. Relative luminance 0.095; OKLCH L 47.4% C 0.204 H 275.0°. Best body text is #FFFFFF at 7.25:1 contrast (WCAG AA passes).

Color values

HEX	#4243CB
RGB	rgb(66, 67, 203)
HSL	hsl(240, 57%, 53%)
HSV	hsv(240, 67%, 80%)
CMYK	cmyk(67.5%, 67%, 0%, 20.4%)
CIE-LAB	lab(36.90, 42.37, -70.48)
CIE-LCH	lch(36.90, 82.24, 301.01°)
OKLab	oklab(47.36% 0.0177 -0.2035)
OKLCH	oklch(47.36% 0.204 275)
XYZ	xyz(15.0299, 9.4830, 57.5267)
Luminance	0.0948 (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

#4243CB #CBCA42

analogous

#4287CB #4243CB #8542CB

triadic

#4243CB #CB4243 #43CB42

tetradic

#4243CB #CB4287 #CBCA42 #42CB85

square

#4243CB #CB4287 #CBCA42 #42CB85

split-complementary

#4243CB #CB8542 #87CB42

monochromatic

#202073 #2D2EA3 #4243CB #7273D8 #A2A2E5

Accessibility & contrast

On white

7.25

#4243CB on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.90

#4243CB on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #4243CB

7.25:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4243CB	#FFFFFF	#000000	##FFFFFF
##4243CB	1.00	7.25	2.90	7.25
#FFFFFF	7.25	1.00	21.00	1.00
#000000	2.90	21.00	1.00	21.00
##FFFFFF	7.25	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005DCF

Deuteranopia (green-blind)

#0051C8

Tritanopia (blue-blind)

#006781

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #4243cb;
/* rgb */ color: rgb(66, 67, 203);
/* oklch */ color: oklch(47.4% 0.204 275.0);

Tailwind

colors: {
  custom: {
    50: '#8878dc',
    500: '#4243cb',
    950: '#000000',
  },
}

SCSS

$custom: #4243cb;
$custom-light: #8878dc;
$custom-dark: #000000;

JSON

{
  "hex": "#4243cb",
  "rgb": {
    "r": 66,
    "g": 67,
    "b": 203
  },
  "hsl": {
    "h": 239.562,
    "s": 56.846,
    "l": 52.745
  },
  "oklch": {
    "l": 0.4736,
    "c": 0.2043,
    "h": 275
  },
  "luminance": 0.09484
}

Semantic roles & 50–950 ramp

primary

#4243CB

secondary

#D2D297

accent

#DF48E0

background

#F9F7FD

surface

#F1EDFB

border

#CBC8D4

text

#0D0915

muted

#7E7B83

Preview Lab

Preview with #4243CB

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

Preview Lab → · Contrast checker → · Palette generator →