#5181CC#5181CC

#5181CC is a mid, vivid blue. Relative luminance 0.218; OKLCH L 60.4% C 0.126 H 259.0°. Best body text is #000000 at 5.36:1 contrast (WCAG AA passes).

Color values

HEX	#5181CC
RGB	rgb(81, 129, 204)
HSL	hsl(217, 55%, 56%)
HSV	hsv(217, 60%, 80%)
CMYK	cmyk(60.3%, 36.8%, 0%, 20%)
CIE-LAB	lab(53.82, 6.68, -43.73)
CIE-LCH	lch(53.82, 44.24, 278.69°)
OKLab	oklab(60.38% -0.0241 -0.124)
OKLCH	oklch(60.38% 0.126 259)
XYZ	xyz(22.1388, 21.8075, 60.1576)
Luminance	0.2181 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5181CC #CC9C51

analogous

#51BFCC #5181CC #5E51CC

triadic

#5181CC #CC5181 #81CC51

tetradic

#5181CC #CC51BF #CC9C51 #51CC5E

square

#5181CC #CC51BF #CC9C51 #51CC5E

split-complementary

#5181CC #CC5E51 #BFCC51

monochromatic

#25487E #3362AD #5181CC #80A3DA #B0C6E8

Accessibility & contrast

On white

3.92

#5181CC on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.36

#5181CC on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #5181CC

5.36:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5181CC	#FFFFFF	#000000	##000000
##5181CC	1.00	3.92	5.36	5.36
#FFFFFF	3.92	1.00	21.00	21.00
#000000	5.36	21.00	1.00	1.00
##000000	5.36	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6187CF

Deuteranopia (green-blind)

#517BCA

Tritanopia (blue-blind)

#00929D

Achromatopsia (no color)

#818181

Design tokens & code

CSS

--color: #5181cc;
/* rgb */ color: rgb(81, 129, 204);
/* oklch */ color: oklch(60.4% 0.126 259.0);

Tailwind

colors: {
  custom: {
    50: '#8ca5dc',
    500: '#5181cc',
    950: '#000000',
  },
}

SCSS

$custom: #5181cc;
$custom-light: #8ca5dc;
$custom-dark: #000000;

JSON

{
  "hex": "#5181cc",
  "rgb": {
    "r": 81,
    "g": 129,
    "b": 204
  },
  "hsl": {
    "h": 216.585,
    "s": 54.667,
    "l": 55.882
  },
  "oklch": {
    "l": 0.60375,
    "c": 0.1263,
    "h": 259
  },
  "luminance": 0.21809
}

Semantic roles & 50–950 ramp

primary

#5181CC

secondary

#D6C2A3

accent

#A44ADE

background

#F9FAFD

surface

#F1F4FB

border

#CBCED4

text

#0D0F15

muted

#7E7F83

Preview Lab

Preview with #5181CC

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

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