#42439B#42439B

#42439B is a dark, vivid blue. Relative luminance 0.075; OKLCH L 43.3% C 0.140 H 278.3°. Best body text is #FFFFFF at 8.37:1 contrast (WCAG AA passes).

Color values

HEX	#42439B
RGB	rgb(66, 67, 155)
HSL	hsl(239, 40%, 43%)
HSV	hsv(239, 57%, 61%)
CMYK	cmyk(57.4%, 56.8%, 0%, 39.2%)
CIE-LAB	lab(33.00, 26.14, -48.38)
CIE-LCH	lch(33.00, 54.99, 298.39°)
OKLab	oklab(43.29% 0.0203 -0.1386)
OKLCH	oklch(43.29% 0.14 278.3)
XYZ	xyz(10.1684, 7.5384, 31.9232)
Luminance	0.0754 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42439B #9B9A42

analogous

#426F9B #42439B #6D429B

triadic

#42439B #9B4243 #439B42

tetradic

#42439B #9B426F #9B9A42 #429B6D

square

#42439B #9B426F #9B9A42 #429B6D

split-complementary

#42439B #9B6D42 #6F9B42

monochromatic

#1D1E45 #303070 #42439B #5F60BB #8A8BCD

Accessibility & contrast

On white

8.37

#42439B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.51

#42439B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #42439B

8.37:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42439B	#FFFFFF	#000000	##FFFFFF
##42439B	1.00	8.37	2.51	8.37
#FFFFFF	8.37	1.00	21.00	1.00
#000000	2.51	21.00	1.00	21.00
##FFFFFF	8.37	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#01519E

Deuteranopia (green-blind)

#004A99

Tritanopia (blue-blind)

#115768

Achromatopsia (no color)

#4E4E4E

Design tokens & code

CSS

--color: #42439b;
/* rgb */ color: rgb(66, 67, 155);
/* oklch */ color: oklch(43.3% 0.140 278.3);

Tailwind

colors: {
  custom: {
    50: '#7f77b9',
    500: '#42439b',
    950: '#000000',
  },
}

SCSS

$custom: #42439b;
$custom-light: #7f77b9;
$custom-dark: #000000;

JSON

{
  "hex": "#42439b",
  "rgb": {
    "r": 66,
    "g": 67,
    "b": 155
  },
  "hsl": {
    "h": 239.326,
    "s": 40.271,
    "l": 43.333
  },
  "oklch": {
    "l": 0.43289,
    "c": 0.14011,
    "h": 278.3
  },
  "luminance": 0.07539
}

Semantic roles & 50–950 ramp

primary

#42439B

secondary

#B8B881

accent

#CF58D0

background

#F8F7FB

surface

#EFEDF6

border

#CAC8D0

text

#0B0811

muted

#7C7B80

Preview Lab

Preview with #42439B

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

Preview Lab → · Contrast checker → · Palette generator →