#5181CB#5181CB

#5181CB is a mid, vivid blue. Relative luminance 0.218; OKLCH L 60.3% C 0.125 H 258.8°. Best body text is #000000 at 5.35:1 contrast (WCAG AA passes).

Color values

HEX	#5181CB
RGB	rgb(81, 129, 203)
HSL	hsl(216, 54%, 56%)
HSV	hsv(216, 60%, 80%)
CMYK	cmyk(60.1%, 36.5%, 0%, 20.4%)
CIE-LAB	lab(53.77, 6.35, -43.24)
CIE-LCH	lch(53.77, 43.71, 278.35°)
OKLab	oklab(60.32% -0.0243 -0.1226)
OKLCH	oklch(60.32% 0.125 258.8)
XYZ	xyz(22.0193, 21.7597, 59.5280)
Luminance	0.2176 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5181CB #CB9B51

analogous

#51BECB #5181CB #5E51CB

triadic

#5181CB #CB5181 #81CB51

tetradic

#5181CB #CB51BE #CB9B51 #51CB5E

square

#5181CB #CB51BE #CB9B51 #51CB5E

split-complementary

#5181CB #CB5E51 #BECB51

monochromatic

#25487C #3363AC #5181CB #80A3D9 #AFC5E7

Accessibility & contrast

On white

3.92

#5181CB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.35

#5181CB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #5181CB

5.35:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5181CB	#FFFFFF	#000000	##000000
##5181CB	1.00	3.92	5.35	5.35
#FFFFFF	3.92	1.00	21.00	21.00
#000000	5.35	21.00	1.00	1.00
##000000	5.35	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6287CE

Deuteranopia (green-blind)

#517BC9

Tritanopia (blue-blind)

#00929C

Achromatopsia (no color)

#808080

Design tokens & code

CSS

--color: #5181cb;
/* rgb */ color: rgb(81, 129, 203);
/* oklch */ color: oklch(60.3% 0.125 258.8);

Tailwind

colors: {
  custom: {
    50: '#8ca5db',
    500: '#5181cb',
    950: '#000000',
  },
}

SCSS

$custom: #5181cb;
$custom-light: #8ca5db;
$custom-dark: #000000;

JSON

{
  "hex": "#5181cb",
  "rgb": {
    "r": 81,
    "g": 129,
    "b": 203
  },
  "hsl": {
    "h": 216.393,
    "s": 53.982,
    "l": 55.686
  },
  "oklch": {
    "l": 0.60319,
    "c": 0.12495,
    "h": 258.8
  },
  "luminance": 0.21762
}

Semantic roles & 50–950 ramp

primary

#5181CB

secondary

#D5C1A3

accent

#A44ADD

background

#F9FAFD

surface

#F1F4FB

border

#CBCED4

text

#0D0F15

muted

#7E7F83

Preview Lab

Preview with #5181CB

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

Preview Lab → · Contrast checker → · Palette generator →