#5181CF#5181CF

#5181CF is a mid, vivid blue. Relative luminance 0.220; OKLCH L 60.5% C 0.130 H 259.7°. Best body text is #000000 at 5.39:1 contrast (WCAG AA passes).

Color values

HEX	#5181CF
RGB	rgb(81, 129, 207)
HSL	hsl(217, 57%, 56%)
HSV	hsv(217, 61%, 81%)
CMYK	cmyk(60.9%, 37.7%, 0%, 18.8%)
CIE-LAB	lab(53.98, 7.69, -45.18)
CIE-LCH	lch(53.98, 45.83, 279.66°)
OKLab	oklab(60.55% -0.0234 -0.1282)
OKLCH	oklch(60.55% 0.13 259.7)
XYZ	xyz(22.5021, 21.9528, 62.0709)
Luminance	0.2195 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5181CF #CF9F51

analogous

#51C0CF #5181CF #6051CF

triadic

#5181CF #CF5181 #81CF51

tetradic

#5181CF #CF51C0 #CF9F51 #51CF60

square

#5181CF #CF51C0 #CF9F51 #51CF60

split-complementary

#5181CF #CF6051 #C0CF51

monochromatic

#244882 #3162B2 #5181CF #81A4DC #B1C6E9

Accessibility & contrast

On white

3.90

#5181CF on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.39

#5181CF on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #5181CF

5.39:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5181CF	#FFFFFF	#000000	##000000
##5181CF	1.00	3.90	5.39	5.39
#FFFFFF	3.90	1.00	21.00	21.00
#000000	5.39	21.00	1.00	1.00
##000000	5.39	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6087D2

Deuteranopia (green-blind)

#4E7CCD

Tritanopia (blue-blind)

#00939E

Achromatopsia (no color)

#818181

Design tokens & code

CSS

--color: #5181cf;
/* rgb */ color: rgb(81, 129, 207);
/* oklch */ color: oklch(60.5% 0.130 259.7);

Tailwind

colors: {
  custom: {
    50: '#8ca5de',
    500: '#5181cf',
    950: '#000000',
  },
}

SCSS

$custom: #5181cf;
$custom-light: #8ca5de;
$custom-dark: #000000;

JSON

{
  "hex": "#5181cf",
  "rgb": {
    "r": 81,
    "g": 129,
    "b": 207
  },
  "hsl": {
    "h": 217.143,
    "s": 56.757,
    "l": 56.471
  },
  "oklch": {
    "l": 0.60546,
    "c": 0.13035,
    "h": 259.7
  },
  "luminance": 0.21955
}

Semantic roles & 50–950 ramp

primary

#5181CF

secondary

#D8C4A4

accent

#A648E0

background

#F9FAFD

surface

#F1F4FB

border

#CBCED4

text

#0D0F15

muted

#7E7F83

Preview Lab

Preview with #5181CF

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

Preview Lab → · Contrast checker → · Palette generator →