#231B73#231B73

#231B73 is a dark, vivid blue. Relative luminance 0.024; OKLCH L 30.2% C 0.143 H 277.6°. Best body text is #FFFFFF at 14.23:1 contrast (WCAG AA passes).

Color values

HEX	#231B73
RGB	rgb(35, 27, 115)
HSL	hsl(245, 62%, 28%)
HSV	hsv(245, 77%, 45%)
CMYK	cmyk(69.6%, 76.5%, 0%, 54.9%)
CIE-LAB	lab(17.36, 32.67, -49.01)
CIE-LCH	lch(17.36, 58.91, 303.69°)
OKLab	oklab(30.17% 0.0188 -0.1416)
OKLCH	oklch(30.17% 0.143 277.6)
XYZ	xyz(4.1786, 2.3786, 16.4552)
Luminance	0.0238 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231B73 #6B731B

analogous

#1B3F73 #231B73 #4F1B73

triadic

#231B73 #73231B #1B7323

tetradic

#231B73 #731B3F #6B731B #1B734F

square

#231B73 #731B3F #6B731B #1B734F

split-complementary

#231B73 #734F1B #3F731B

monochromatic

#080619 #140F41 #231B73 #3227A5 #4638D0

Accessibility & contrast

On white

14.23

#231B73 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.48

#231B73 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231B73

14.23:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231B73	#FFFFFF	#000000	##FFFFFF
##231B73	1.00	14.23	1.48	14.23
#FFFFFF	14.23	1.00	21.00	1.00
#000000	1.48	21.00	1.00	21.00
##FFFFFF	14.23	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#002E76

Deuteranopia (green-blind)

#002771

Tritanopia (blue-blind)

#003445

Achromatopsia (no color)

#2B2B2B

Design tokens & code

CSS

--color: #231b73;
/* rgb */ color: rgb(35, 27, 115);
/* oklch */ color: oklch(30.2% 0.143 277.6);

Tailwind

colors: {
  custom: {
    50: '#6a599c',
    500: '#231b73',
    950: '#000000',
  },
}

SCSS

$custom: #231b73;
$custom-light: #6a599c;
$custom-dark: #000000;

JSON

{
  "hex": "#231b73",
  "rgb": {
    "r": 35,
    "g": 27,
    "b": 115
  },
  "hsl": {
    "h": 245.455,
    "s": 61.972,
    "l": 27.843
  },
  "oklch": {
    "l": 0.3017,
    "c": 0.14281,
    "h": 277.6
  },
  "luminance": 0.02379
}

Semantic roles & 50–950 ramp

primary

#231B73

secondary

#9EA842

accent

#E543D6

background

#F6F5F9

surface

#ECE9F2

border

#C7C5CC

text

#07030E

muted

#7A787E

Preview Lab

Preview with #231B73

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

Preview Lab → · Contrast checker → · Palette generator →