#1F51B4#1F51B4

#1F51B4 is a mid, vivid blue. Relative luminance 0.095; OKLCH L 46.3% C 0.167 H 262.0°. Best body text is #FFFFFF at 7.26:1 contrast (WCAG AA passes).

Color values

HEX	#1F51B4
RGB	rgb(31, 81, 180)
HSL	hsl(220, 71%, 41%)
HSV	hsv(220, 83%, 71%)
CMYK	cmyk(82.8%, 55%, 0%, 29.4%)
CIE-LAB	lab(36.87, 21.12, -57.13)
CIE-LCH	lch(36.87, 60.91, 290.29°)
OKLab	oklab(46.32% -0.0231 -0.1649)
OKLCH	oklch(46.32% 0.167 262)
XYZ	xyz(11.7428, 9.4700, 44.3802)
Luminance	0.0947 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#1F51B4 #B4821F

analogous

#1F9CB4 #1F51B4 #381FB4

triadic

#1F51B4 #B41F51 #51B41F

tetradic

#1F51B4 #B41F9C #B4821F #1FB438

square

#1F51B4 #B41F9C #B4821F #1FB438

split-complementary

#1F51B4 #B4381F #9CB41F

monochromatic

#0D224C #163A80 #1F51B4 #346CDC #6892E5

Accessibility & contrast

On white

7.26

#1F51B4 on #FFFFFF

AA ✓AA large ✓AAA ✓

On black

2.89

#1F51B4 on #000000

AA ✗AA large ✗AAA ✗

Best text color

#FFFFFF on #1F51B4

7.26:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##1F51B4	#FFFFFF	#000000	##FFFFFF
##1F51B4	1.00	7.26	2.89	7.26
#FFFFFF	7.26	1.00	21.00	1.00
#000000	2.89	21.00	1.00	21.00
##FFFFFF	7.26	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#005EB7

Deuteranopia (green-blind)

#0050B2

Tritanopia (blue-blind)

#006A7A

Achromatopsia (no color)

#575757

Design tokens & code

CSS

--color: #1f51b4;
/* rgb */ color: rgb(31, 81, 180);
/* oklch */ color: oklch(46.3% 0.167 262.0);

Tailwind

colors: {
  custom: {
    50: '#7581cb',
    500: '#1f51b4',
    950: '#000000',
  },
}

SCSS

$custom: #1f51b4;
$custom-light: #7581cb;
$custom-dark: #000000;

JSON

{
  "hex": "#1f51b4",
  "rgb": {
    "r": 31,
    "g": 81,
    "b": 180
  },
  "hsl": {
    "h": 219.866,
    "s": 70.616,
    "l": 41.373
  },
  "oklch": {
    "l": 0.46315,
    "c": 0.1665,
    "h": 262
  },
  "luminance": 0.09471
}

Semantic roles & 50–950 ramp

primary

#1F51B4

secondary

#CBA864

accent

#B13AED

background

#F7F7FC

surface

#EEEEF9

border

#C9C9D2

text

#0A0A13

muted

#7C7C82

Preview Lab

Preview with #1F51B4

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

Preview Lab → · Contrast checker → · Palette generator →