#1B1BB4#1B1BB4

#1B1BB4 is a dark, highly saturated blue. Relative luminance 0.043; OKLCH L 37.4% C 0.224 H 268.6°. Best body text is #FFFFFF at 11.28:1 contrast (WCAG AA passes).

Color values

HEX	#1B1BB4
RGB	rgb(27, 27, 180)
HSL	hsl(240, 74%, 41%)
HSV	hsv(240, 85%, 71%)
CMYK	cmyk(85%, 85%, 0%, 29.4%)
CIE-LAB	lab(24.67, 53.24, -77.20)
CIE-LCH	lch(24.67, 93.78, 304.59°)
OKLab	oklab(37.4% -0.0056 -0.2235)
OKLCH	oklch(37.4% 0.224 268.6)
XYZ	xyz(9.0793, 4.3111, 43.5248)
Luminance	0.0431 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B1BB4 #B4B41B

analogous

#1B67B4 #1B1BB4 #671BB4

triadic

#1B1BB4 #B41B1B #1BB41B

tetradic

#1B1BB4 #B41B67 #B4B41B #1BB467

square

#1B1BB4 #B41B67 #B4B41B #1BB467

split-complementary

#1B1BB4 #B4671B #67B41B

monochromatic

#0B0B4A #13137F #1B1BB4 #2D2DDF #6262E7

Accessibility & contrast

On white

11.28

#1B1BB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

1.86

#1B1BB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B1BB4

11.28:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B1BB4	#FFFFFF	#000000	##FFFFFF
##1B1BB4	1.00	11.28	1.86	11.28
#FFFFFF	11.28	1.00	21.00	1.00
#000000	1.86	21.00	1.00	21.00
##FFFFFF	11.28	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0042B8

Deuteranopia (green-blind)

#0032B2

Tritanopia (blue-blind)

#004E6B

Achromatopsia (no color)

#3B3B3B

Design tokens & code

CSS

--color: #1b1bb4;
/* rgb */ color: rgb(27, 27, 180);
/* oklch */ color: oklch(37.4% 0.224 268.6);

Tailwind

colors: {
  custom: {
    50: '#795dcc',
    500: '#1b1bb4',
    950: '#000000',
  },
}

SCSS

$custom: #1b1bb4;
$custom-light: #795dcc;
$custom-dark: #000000;

JSON

{
  "hex": "#1b1bb4",
  "rgb": {
    "r": 27,
    "g": 27,
    "b": 180
  },
  "hsl": {
    "h": 240,
    "s": 73.913,
    "l": 40.588
  },
  "oklch": {
    "l": 0.374,
    "c": 0.22354,
    "h": 268.6
  },
  "luminance": 0.04312
}

Semantic roles & 50–950 ramp

primary

#1B1BB4

secondary

#CCCC5F

accent

#F137F1

background

#F8F5FC

surface

#EFE9F9

border

#CAC5D2

text

#0B0414

muted

#7C7982

Preview Lab

Preview with #1B1BB4

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

Preview Lab → · Contrast checker → · Palette generator →