#42397B#42397B

#42397B is a dark, moderate blue. Relative luminance 0.055; OKLCH L 39.0% C 0.108 H 286.5°. Best body text is #FFFFFF at 9.99:1 contrast (WCAG AA passes).

Color values

HEX	#42397B
RGB	rgb(66, 57, 123)
HSL	hsl(248, 37%, 35%)
HSV	hsv(248, 54%, 48%)
CMYK	cmyk(46.3%, 53.7%, 0%, 51.8%)
CIE-LAB	lab(28.15, 22.07, -36.45)
CIE-LCH	lch(28.15, 42.61, 301.19°)
OKLab	oklab(38.96% 0.0307 -0.1036)
OKLCH	oklch(38.96% 0.108 286.5)
XYZ	xyz(7.2840, 5.5143, 19.4156)
Luminance	0.0551 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#42397B #727B39

analogous

#39517B #42397B #63397B

triadic

#42397B #7B4239 #397B42

tetradic

#42397B #7B3951 #727B39 #397B63

square

#42397B #7B3951 #727B39 #397B63

split-complementary

#42397B #7B6339 #517B39

monochromatic

#151227 #2C2651 #42397B #584CA5 #7C71BD

Accessibility & contrast

On white

9.99

#42397B on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.10

#42397B on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #42397B

9.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##42397B	#FFFFFF	#000000	##FFFFFF
##42397B	1.00	9.99	2.10	9.99
#FFFFFF	9.99	1.00	21.00	1.00
#000000	2.10	21.00	1.00	21.00
##FFFFFF	9.99	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1B447D

Deuteranopia (green-blind)

#1A417A

Tritanopia (blue-blind)

#304754

Achromatopsia (no color)

#424242

Design tokens & code

CSS

--color: #42397b;
/* rgb */ color: rgb(66, 57, 123);
/* oklch */ color: oklch(39.0% 0.108 286.5);

Tailwind

colors: {
  custom: {
    50: '#7a6fa2',
    500: '#42397b',
    950: '#000000',
  },
}

SCSS

$custom: #42397b;
$custom-light: #7a6fa2;
$custom-dark: #000000;

JSON

{
  "hex": "#42397b",
  "rgb": {
    "r": 66,
    "g": 57,
    "b": 123
  },
  "hsl": {
    "h": 248.182,
    "s": 36.667,
    "l": 35.294
  },
  "oklch": {
    "l": 0.38956,
    "c": 0.10805,
    "h": 286.5
  },
  "luminance": 0.05515
}

Semantic roles & 50–950 ramp

primary

#42397B

secondary

#9EA669

accent

#CD5BBD

background

#F7F6FA

surface

#EEECF3

border

#C9C7CD

text

#09070F

muted

#7B7A7F

Preview Lab

Preview with #42397B

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

Preview Lab → · Contrast checker → · Palette generator →