#1B51B4#1B51B4

#1B51B4 is a mid, vivid blue. Relative luminance 0.094; OKLCH L 46.2% C 0.167 H 261.3°. Best body text is #FFFFFF at 7.29:1 contrast (WCAG AA passes).

Color values

HEX	#1B51B4
RGB	rgb(27, 81, 180)
HSL	hsl(219, 74%, 41%)
HSV	hsv(219, 85%, 71%)
CMYK	cmyk(85%, 55%, 0%, 29.4%)
CIE-LAB	lab(36.77, 20.79, -57.31)
CIE-LCH	lch(36.77, 60.96, 289.94°)
OKLab	oklab(46.2% -0.0253 -0.1655)
OKLCH	oklch(46.2% 0.167 261.3)
XYZ	xyz(11.6297, 9.4117, 44.3749)
Luminance	0.0941 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1B51B4 #B47E1B

analogous

#1B9DB4 #1B51B4 #321BB4

triadic

#1B51B4 #B41B51 #51B41B

tetradic

#1B51B4 #B41B9D #B47E1B #1BB432

square

#1B51B4 #B41B9D #B47E1B #1BB432

split-complementary

#1B51B4 #B4321B #9DB41B

monochromatic

#0B214A #13397F #1B51B4 #2D6CDF #6291E7

Accessibility & contrast

On white

7.29

#1B51B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.88

#1B51B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1B51B4

7.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1B51B4	#FFFFFF	#000000	##FFFFFF
##1B51B4	1.00	7.29	2.88	7.29
#FFFFFF	7.29	1.00	21.00	1.00
#000000	2.88	21.00	1.00	21.00
##FFFFFF	7.29	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005EB7

Deuteranopia (green-blind)

#0050B2

Tritanopia (blue-blind)

#006A7A

Achromatopsia (no color)

#565656

Design tokens & code

CSS

--color: #1b51b4;
/* rgb */ color: rgb(27, 81, 180);
/* oklch */ color: oklch(46.2% 0.167 261.3);

Tailwind

colors: {
  custom: {
    50: '#7481cb',
    500: '#1b51b4',
    950: '#000000',
  },
}

SCSS

$custom: #1b51b4;
$custom-light: #7481cb;
$custom-dark: #000000;

JSON

{
  "hex": "#1b51b4",
  "rgb": {
    "r": 27,
    "g": 81,
    "b": 180
  },
  "hsl": {
    "h": 218.824,
    "s": 73.913,
    "l": 40.588
  },
  "oklch": {
    "l": 0.46202,
    "c": 0.16741,
    "h": 261.3
  },
  "luminance": 0.09413
}

Semantic roles & 50–950 ramp

primary

#1B51B4

secondary

#CCA55F

accent

#AF37F1

background

#F7F7FC

surface

#EEEEF9

border

#C9C9D2

text

#0A0A13

muted

#7C7C82

Preview Lab

Preview with #1B51B4

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

Preview Lab → · Contrast checker → · Palette generator →