#423BB9#423BB9

#423BB9 is a dark, vivid blue. Relative luminance 0.078; OKLCH L 44.4% C 0.191 H 277.7°. Best body text is #FFFFFF at 8.21:1 contrast (WCAG AA passes).

Color values

HEX	#423BB9
RGB	rgb(66, 59, 185)
HSL	hsl(243, 52%, 48%)
HSV	hsv(243, 68%, 73%)
CMYK	cmyk(64.3%, 68.1%, 0%, 27.5%)
CIE-LAB	lab(33.54, 41.19, -65.45)
CIE-LCH	lch(33.54, 77.33, 302.18°)
OKLab	oklab(44.44% 0.0257 -0.1888)
OKLCH	oklch(44.44% 0.191 277.7)
XYZ	xyz(12.5649, 7.7879, 46.7306)
Luminance	0.0779 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Ocean Blue

#4F42B5

ΔE00 2.50

Blue With A Hint Of Purple

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#423BB9 #B2B93B

analogous

#3B73B9 #423BB9 #813BB9

triadic

#423BB9 #B9423B #3BB942

tetradic

#423BB9 #B93B73 #B2B93B #3BB981

square

#423BB9 #B93B73 #B2B93B #3BB981

split-complementary

#423BB9 #B9813B #73B93B

monochromatic

#211D5C #312C8B #423BB9 #6A64CD #9692DC

Accessibility & contrast

On white

8.21

#423BB9 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.56

#423BB9 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #423BB9

8.21:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##423BB9	#FFFFFF	#000000	##FFFFFF
##423BB9	1.00	8.21	2.56	8.21
#FFFFFF	8.21	1.00	21.00	1.00
#000000	2.56	21.00	1.00	21.00
##FFFFFF	8.21	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0054BD

Deuteranopia (green-blind)

#004AB7

Tritanopia (blue-blind)

#005C75

Achromatopsia (no color)

#4F4F4F

Design tokens & code

CSS

--color: #423bb9;
/* rgb */ color: rgb(66, 59, 185);
/* oklch */ color: oklch(44.4% 0.191 277.7);

Tailwind

colors: {
  custom: {
    50: '#8572cf',
    500: '#423bb9',
    950: '#000000',
  },
}

SCSS

$custom: #423bb9;
$custom-light: #8572cf;
$custom-dark: #000000;

JSON

{
  "hex": "#423bb9",
  "rgb": {
    "r": 66,
    "g": 59,
    "b": 185
  },
  "hsl": {
    "h": 243.333,
    "s": 51.639,
    "l": 47.843
  },
  "oklch": {
    "l": 0.4444,
    "c": 0.19056,
    "h": 277.7
  },
  "luminance": 0.07789
}

Semantic roles & 50–950 ramp

primary

#423BB9

secondary

#C4C788

accent

#DB4DD3

background

#F8F6FC

surface

#F0ECF9

border

#CBC7D2

text

#0C0814

muted

#7D7B82

Preview Lab

Preview with #423BB9

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

Preview Lab → · Contrast checker → · Palette generator →