#42378C#42378C

#42378C is a dark, vivid blue. Relative luminance 0.058; OKLCH L 39.9% C 0.136 H 284.3°. Best body text is #FFFFFF at 9.74:1 contrast (WCAG AA passes).

Color values

HEX	#42378C
RGB	rgb(66, 55, 140)
HSL	hsl(248, 44%, 38%)
HSV	hsv(248, 61%, 55%)
CMYK	cmyk(52.9%, 60.7%, 0%, 45.1%)
CIE-LAB	lab(28.86, 28.87, -45.91)
CIE-LCH	lch(28.86, 54.23, 302.16°)
OKLab	oklab(39.87% 0.0335 -0.1314)
OKLCH	oklch(39.87% 0.136 284.3)
XYZ	xyz(8.3452, 5.7836, 25.4825)
Luminance	0.0578 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42378C #818C37

analogous

#37568C #42378C #6C378C

triadic

#42378C #8C4237 #378C42

tetradic

#42378C #8C3756 #818C37 #378C6C

square

#42378C #8C3756 #818C37 #378C6C

split-complementary

#42378C #8C6C37 #568C37

monochromatic

#191434 #2D2660 #42378C #5749B7 #8075C9

Accessibility & contrast

On white

9.74

#42378C on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.16

#42378C on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #42378C

9.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42378C	#FFFFFF	#000000	##FFFFFF
##42378C	1.00	9.74	2.16	9.74
#FFFFFF	9.74	1.00	21.00	1.00
#000000	2.16	21.00	1.00	21.00
##FFFFFF	9.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#00478F

Deuteranopia (green-blind)

#00418A

Tritanopia (blue-blind)

#254B5C

Achromatopsia (no color)

#444444

Design tokens & code

CSS

--color: #42378c;
/* rgb */ color: rgb(66, 55, 140);
/* oklch */ color: oklch(39.9% 0.136 284.3);

Tailwind

colors: {
  custom: {
    50: '#7d6eae',
    500: '#42378c',
    950: '#000000',
  },
}

SCSS

$custom: #42378c;
$custom-light: #7d6eae;
$custom-dark: #000000;

JSON

{
  "hex": "#42378c",
  "rgb": {
    "r": 66,
    "g": 55,
    "b": 140
  },
  "hsl": {
    "h": 247.765,
    "s": 43.59,
    "l": 38.235
  },
  "oklch": {
    "l": 0.39868,
    "c": 0.13564,
    "h": 284.3
  },
  "luminance": 0.05784
}

Semantic roles & 50–950 ramp

primary

#42378C

secondary

#A9B16D

accent

#D354C3

background

#F7F6FA

surface

#EEECF4

border

#C9C7CE

text

#0A0710

muted

#7C7A7F

Preview Lab

Preview with #42378C

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

Preview Lab → · Contrast checker → · Palette generator →