#1D51B3#1D51B3

#1D51B3 is a mid, vivid blue. Relative luminance 0.094; OKLCH L 46.2% C 0.166 H 261.6°. Best body text is #FFFFFF at 7.29:1 contrast (WCAG AA passes).

Color values

HEX	#1D51B3
RGB	rgb(29, 81, 179)
HSL	hsl(219, 72%, 41%)
HSV	hsv(219, 84%, 70%)
CMYK	cmyk(83.8%, 54.7%, 0%, 29.8%)
CIE-LAB	lab(36.74, 20.56, -56.75)
CIE-LCH	lch(36.74, 60.36, 289.91°)
OKLab	oklab(46.18% -0.0243 -0.1638)
OKLCH	oklch(46.18% 0.166 261.6)
XYZ	xyz(11.5829, 9.3993, 43.8429)
Luminance	0.0940 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1D51B3 #B37F1D

analogous

#1D9CB3 #1D51B3 #341DB3

triadic

#1D51B3 #B31D51 #51B31D

tetradic

#1D51B3 #B31D9C #B37F1D #1DB334

square

#1D51B3 #B31D9C #B37F1D #1DB334

split-complementary

#1D51B3 #B3341D #9CB31D

monochromatic

#0C214A #14397E #1D51B3 #306CDD #6491E6

Accessibility & contrast

On white

7.29

#1D51B3 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.88

#1D51B3 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1D51B3

7.29:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1D51B3	#FFFFFF	#000000	##FFFFFF
##1D51B3	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)

#005EB6

Deuteranopia (green-blind)

#0050B1

Tritanopia (blue-blind)

#00697A

Achromatopsia (no color)

#565656

Design tokens & code

CSS

--color: #1d51b3;
/* rgb */ color: rgb(29, 81, 179);
/* oklch */ color: oklch(46.2% 0.166 261.6);

Tailwind

colors: {
  custom: {
    50: '#7481ca',
    500: '#1d51b3',
    950: '#000000',
  },
}

SCSS

$custom: #1d51b3;
$custom-light: #7481ca;
$custom-dark: #000000;

JSON

{
  "hex": "#1d51b3",
  "rgb": {
    "r": 29,
    "g": 81,
    "b": 179
  },
  "hsl": {
    "h": 219.2,
    "s": 72.115,
    "l": 40.784
  },
  "oklch": {
    "l": 0.46176,
    "c": 0.16563,
    "h": 261.6
  },
  "luminance": 0.09401
}

Semantic roles & 50–950 ramp

primary

#1D51B3

secondary

#CBA661

accent

#B039EF

background

#F7F7FC

surface

#EEEEF8

border

#C9C9D1

text

#0A0A13

muted

#7C7C82

Preview Lab

Preview with #1D51B3

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

Preview Lab → · Contrast checker → · Palette generator →