#1B23A0#1B23A0

#1B23A0 is a dark, vivid blue. Relative luminance 0.040; OKLCH L 35.9% C 0.194 H 269.0°. Best body text is #FFFFFF at 11.70:1 contrast (WCAG AA passes).

Color values

HEX	#1B23A0
RGB	rgb(27, 35, 160)
HSL	hsl(236, 71%, 37%)
HSV	hsv(236, 83%, 63%)
CMYK	cmyk(83.1%, 78.1%, 0%, 37.3%)
CIE-LAB	lab(23.58, 42.86, -66.95)
CIE-LCH	lch(23.58, 79.49, 302.63°)
OKLab	oklab(35.94% -0.0033 -0.194)
OKLCH	oklch(35.94% 0.194 269)
XYZ	xyz(7.3960, 3.9723, 33.6278)
Luminance	0.0397 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B23A0 #A0981B

analogous

#1B66A0 #1B23A0 #561BA0

triadic

#1B23A0 #A01B23 #23A01B

tetradic

#1B23A0 #A01B66 #A0981B #1BA056

square

#1B23A0 #A01B66 #A0981B #1BA056

split-complementary

#1B23A0 #A0561B #66A01B

monochromatic

#090C37 #12186C #1B23A0 #242ED4 #535CE2

Accessibility & contrast

On white

11.70

#1B23A0 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.79

#1B23A0 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B23A0

11.70:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B23A0	#FFFFFF	#000000	##FFFFFF
##1B23A0	1.00	11.70	1.79	11.70
#FFFFFF	11.70	1.00	21.00	1.00
#000000	1.79	21.00	1.00	21.00
##FFFFFF	11.70	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#003FA4

Deuteranopia (green-blind)

#00319E

Tritanopia (blue-blind)

#004961

Achromatopsia (no color)

#383838

Design tokens & code

CSS

--color: #1b23a0;
/* rgb */ color: rgb(27, 35, 160);
/* oklch */ color: oklch(35.9% 0.194 269.0);

Tailwind

colors: {
  custom: {
    50: '#7360bd',
    500: '#1b23a0',
    950: '#000000',
  },
}

SCSS

$custom: #1b23a0;
$custom-light: #7360bd;
$custom-dark: #000000;

JSON

{
  "hex": "#1b23a0",
  "rgb": {
    "r": 27,
    "g": 35,
    "b": 160
  },
  "hsl": {
    "h": 236.391,
    "s": 71.123,
    "l": 36.667
  },
  "oklch": {
    "l": 0.35936,
    "c": 0.194,
    "h": 269
  },
  "luminance": 0.03973
}

Semantic roles & 50–950 ramp

primary

#1B23A0

secondary

#C5BE52

accent

#E33AEE

background

#F7F5FB

surface

#EEE9F7

border

#C9C5D0

text

#0A0512

muted

#7C7981

Preview Lab

Preview with #1B23A0

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

Preview Lab → · Contrast checker → · Palette generator →