#1B4BB4#1B4BB4

#1B4BB4 is a dark, vivid blue. Relative luminance 0.086; OKLCH L 45.0% C 0.175 H 262.9°. Best body text is #FFFFFF at 7.74:1 contrast (WCAG AA passes).

Color values

HEX	#1B4BB4
RGB	rgb(27, 75, 180)
HSL	hsl(221, 74%, 41%)
HSV	hsv(221, 85%, 71%)
CMYK	cmyk(85%, 58.3%, 0%, 29.4%)
CIE-LAB	lab(35.12, 24.80, -59.98)
CIE-LCH	lch(35.12, 64.91, 292.47°)
OKLab	oklab(44.96% -0.0217 -0.1735)
OKLCH	oklch(44.96% 0.175 262.9)
XYZ	xyz(11.2033, 8.5591, 44.2328)
Luminance	0.0856 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B4BB4 #B4841B

analogous

#1B98B4 #1B4BB4 #371BB4

triadic

#1B4BB4 #B41B4B #4BB41B

tetradic

#1B4BB4 #B41B98 #B4841B #1BB437

square

#1B4BB4 #B41B98 #B4841B #1BB437

split-complementary

#1B4BB4 #B4371B #98B41B

monochromatic

#0B1F4A #13357F #1B4BB4 #2D65DF #628CE7

Accessibility & contrast

On white

7.74

#1B4BB4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.71

#1B4BB4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B4BB4

7.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B4BB4	#FFFFFF	#000000	##FFFFFF
##1B4BB4	1.00	7.74	2.71	7.74
#FFFFFF	7.74	1.00	21.00	1.00
#000000	2.71	21.00	1.00	21.00
##FFFFFF	7.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005AB8

Deuteranopia (green-blind)

#004CB2

Tritanopia (blue-blind)

#006678

Achromatopsia (no color)

#535353

Design tokens & code

CSS

--color: #1b4bb4;
/* rgb */ color: rgb(27, 75, 180);
/* oklch */ color: oklch(45.0% 0.175 262.9);

Tailwind

colors: {
  custom: {
    50: '#747ccb',
    500: '#1b4bb4',
    950: '#000000',
  },
}

SCSS

$custom: #1b4bb4;
$custom-light: #747ccb;
$custom-dark: #000000;

JSON

{
  "hex": "#1b4bb4",
  "rgb": {
    "r": 27,
    "g": 75,
    "b": 180
  },
  "hsl": {
    "h": 221.176,
    "s": 73.913,
    "l": 40.588
  },
  "oklch": {
    "l": 0.44961,
    "c": 0.17481,
    "h": 262.9
  },
  "luminance": 0.0856
}

Semantic roles & 50–950 ramp

primary

#1B4BB4

secondary

#CCAA5F

accent

#B637F1

background

#F7F7FC

surface

#EEEEF9

border

#C9C9D2

text

#0A0913

muted

#7C7B82

Preview Lab

Preview with #1B4BB4

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

Preview Lab → · Contrast checker → · Palette generator →