#231BB4#231BB4

#231BB4 is a dark, highly saturated blue. Relative luminance 0.044; OKLCH L 37.8% C 0.221 H 270.7°. Best body text is #FFFFFF at 11.13:1 contrast (WCAG AA passes).

Color values

HEX	#231BB4
RGB	rgb(35, 27, 180)
HSL	hsl(243, 74%, 41%)
HSV	hsv(243, 85%, 71%)
CMYK	cmyk(80.6%, 85%, 0%, 29.4%)
CIE-LAB	lab(25.06, 53.58, -76.55)
CIE-LCH	lch(25.06, 93.44, 304.99°)
OKLab	oklab(37.77% 0.0029 -0.2215)
OKLCH	oklch(37.77% 0.221 270.7)
XYZ	xyz(9.3205, 4.4354, 43.5361)
Luminance	0.0444 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#231BB4 #ACB41B

analogous

#1B60B4 #231BB4 #6F1BB4

triadic

#231BB4 #B4231B #1BB423

tetradic

#231BB4 #B41B60 #ACB41B #1BB46F

square

#231BB4 #B41B60 #ACB41B #1BB46F

split-complementary

#231BB4 #B46F1B #60B41B

monochromatic

#0E0B4A #19137F #231BB4 #362DDF #6962E7

Accessibility & contrast

On white

11.13

#231BB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.89

#231BB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #231BB4

11.13:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##231BB4	#FFFFFF	#000000	##FFFFFF
##231BB4	1.00	11.13	1.89	11.13
#FFFFFF	11.13	1.00	21.00	1.00
#000000	1.89	21.00	1.00	21.00
##FFFFFF	11.13	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0043B8

Deuteranopia (green-blind)

#0033B2

Tritanopia (blue-blind)

#004E6B

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #231bb4;
/* rgb */ color: rgb(35, 27, 180);
/* oklch */ color: oklch(37.8% 0.221 270.7);

Tailwind

colors: {
  custom: {
    50: '#7b5dcc',
    500: '#231bb4',
    950: '#000000',
  },
}

SCSS

$custom: #231bb4;
$custom-light: #7b5dcc;
$custom-dark: #000000;

JSON

{
  "hex": "#231bb4",
  "rgb": {
    "r": 35,
    "g": 27,
    "b": 180
  },
  "hsl": {
    "h": 243.137,
    "s": 73.913,
    "l": 40.588
  },
  "oklch": {
    "l": 0.37773,
    "c": 0.22149,
    "h": 270.7
  },
  "luminance": 0.04436
}

Semantic roles & 50–950 ramp

primary

#231BB4

secondary

#C6CC5F

accent

#F137E7

background

#F8F5FC

surface

#EFE9F9

border

#CAC5D2

text

#0B0514

muted

#7C7982

Preview Lab

Preview with #231BB4

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

Preview Lab → · Contrast checker → · Palette generator →