#5151CC#5151CC

#5151CC is a mid, vivid blue. Relative luminance 0.120; OKLCH L 50.8% C 0.186 H 277.5°. Best body text is #FFFFFF at 6.18:1 contrast (WCAG AA passes).

Color values

HEX	#5151CC
RGB	rgb(81, 81, 204)
HSL	hsl(240, 55%, 56%)
HSV	hsv(240, 60%, 80%)
CMYK	cmyk(60.3%, 60.3%, 0%, 20%)
CIE-LAB	lab(41.20, 36.42, -63.98)
CIE-LCH	lch(41.20, 73.62, 299.65°)
OKLab	oklab(50.79% 0.0243 -0.184)
OKLCH	oklch(50.79% 0.186 277.5)
XYZ	xyz(17.2313, 11.9925, 58.5218)
Luminance	0.1199 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5151CC #CCCC51

analogous

#518ECC #5151CC #8E51CC

triadic

#5151CC #CC5151 #51CC51

tetradic

#5151CC #CC518E #CCCC51 #51CC8E

square

#5151CC #CC518E #CCCC51 #51CC8E

split-complementary

#5151CC #CC8E51 #8ECC51

monochromatic

#25257E #3333AD #5151CC #8080DA #B0B0E8

Accessibility & contrast

On white

6.18

#5151CC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.40

#5151CC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5151CC

6.18:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5151CC	#FFFFFF	#000000	##FFFFFF
##5151CC	1.00	6.18	3.40	6.18
#FFFFFF	6.18	1.00	21.00	1.00
#000000	3.40	21.00	1.00	21.00
##FFFFFF	6.18	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0066D0

Deuteranopia (green-blind)

#005CCA

Tritanopia (blue-blind)

#006F87

Achromatopsia (no color)

#616161

Design tokens & code

CSS

--color: #5151cc;
/* rgb */ color: rgb(81, 81, 204);
/* oklch */ color: oklch(50.8% 0.186 277.5);

Tailwind

colors: {
  custom: {
    50: '#8e82dc',
    500: '#5151cc',
    950: '#000000',
  },
}

SCSS

$custom: #5151cc;
$custom-light: #8e82dc;
$custom-dark: #000000;

JSON

{
  "hex": "#5151cc",
  "rgb": {
    "r": 81,
    "g": 81,
    "b": 204
  },
  "hsl": {
    "h": 240,
    "s": 54.667,
    "l": 55.882
  },
  "oklch": {
    "l": 0.50794,
    "c": 0.18559,
    "h": 277.5
  },
  "luminance": 0.11994
}

Semantic roles & 50–950 ramp

primary

#5151CC

secondary

#D6D6A3

accent

#DE4ADE

background

#F9F7FD

surface

#F2EEFB

border

#CCC9D4

text

#0D0A15

muted

#7E7C83

Preview Lab

Preview with #5151CC

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

Preview Lab → · Contrast checker → · Palette generator →