#4243CF#4243CF

#4243CF is a mid, highly saturated blue. Relative luminance 0.097; OKLCH L 47.7% C 0.209 H 274.7°. Best body text is #FFFFFF at 7.15:1 contrast (WCAG AA passes).

Color values

HEX	#4243CF
RGB	rgb(66, 67, 207)
HSL	hsl(240, 59%, 54%)
HSV	hsv(240, 68%, 81%)
CMYK	cmyk(68.1%, 67.6%, 0%, 18.8%)
CIE-LAB	lab(37.25, 43.70, -72.21)
CIE-LCH	lch(37.25, 84.41, 301.18°)
OKLab	oklab(47.73% 0.0173 -0.2086)
OKLCH	oklch(47.73% 0.209 274.7)
XYZ	xyz(15.5127, 9.6761, 60.0696)
Luminance	0.0968 (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

#4243CF #CFCE42

analogous

#428ACF #4243CF #8742CF

triadic

#4243CF #CF4243 #43CF42

tetradic

#4243CF #CF428A #CFCE42 #42CF87

square

#4243CF #CF428A #CFCE42 #42CF87

split-complementary

#4243CF #CF8742 #8ACF42

monochromatic

#1F1F78 #2B2CA9 #4243CF #7374DB #A4A4E8

Accessibility & contrast

On white

7.15

#4243CF on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.94

#4243CF on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #4243CF

7.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##4243CF	#FFFFFF	#000000	##FFFFFF
##4243CF	1.00	7.15	2.94	7.15
#FFFFFF	7.15	1.00	21.00	1.00
#000000	2.94	21.00	1.00	21.00
##FFFFFF	7.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005ED3

Deuteranopia (green-blind)

#0051CC

Tritanopia (blue-blind)

#006983

Achromatopsia (no color)

#585858

Design tokens & code

CSS

--color: #4243cf;
/* rgb */ color: rgb(66, 67, 207);
/* oklch */ color: oklch(47.7% 0.209 274.7);

Tailwind

colors: {
  custom: {
    50: '#8878df',
    500: '#4243cf',
    950: '#000000',
  },
}

SCSS

$custom: #4243cf;
$custom-light: #8878df;
$custom-dark: #000000;

JSON

{
  "hex": "#4243cf",
  "rgb": {
    "r": 66,
    "g": 67,
    "b": 207
  },
  "hsl": {
    "h": 239.574,
    "s": 59.494,
    "l": 53.529
  },
  "oklch": {
    "l": 0.47727,
    "c": 0.20931,
    "h": 274.7
  },
  "luminance": 0.09678
}

Semantic roles & 50–950 ramp

primary

#4243CF

secondary

#D5D498

accent

#E245E3

background

#F9F7FD

surface

#F1EDFB

border

#CBC8D4

text

#0D0915

muted

#7E7B83

Preview Lab

Preview with #4243CF

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

Preview Lab → · Contrast checker → · Palette generator →