#5151B4#5151B4

#5151B4 is a mid, vivid blue. Relative luminance 0.109; OKLCH L 49.0% C 0.153 H 279.1°. Best body text is #FFFFFF at 6.59:1 contrast (WCAG AA passes).

Color values

HEX	#5151B4
RGB	rgb(81, 81, 180)
HSL	hsl(240, 40%, 51%)
HSV	hsv(240, 55%, 71%)
CMYK	cmyk(55%, 55%, 0%, 29.4%)
CIE-LAB	lab(39.46, 28.55, -52.82)
CIE-LCH	lch(39.46, 60.04, 298.40°)
OKLab	oklab(48.95% 0.0243 -0.1511)
OKLCH	oklch(48.95% 0.153 279.1)
XYZ	xyz(14.5714, 10.9285, 44.5128)
Luminance	0.1093 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5151B4 #B4B451

analogous

#5182B4 #5151B4 #8251B4

triadic

#5151B4 #B45151 #51B451

tetradic

#5151B4 #B45182 #B4B451 #51B482

square

#5151B4 #B45182 #B4B451 #51B482

split-complementary

#5151B4 #B48251 #82B451

monochromatic

#2A2A61 #3C3C8C #5151B4 #7C7CC6 #A7A7D9

Accessibility & contrast

On white

6.59

#5151B4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.19

#5151B4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5151B4

6.59:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5151B4	#FFFFFF	#000000	##FFFFFF
##5151B4	1.00	6.59	3.19	6.59
#FFFFFF	6.59	1.00	21.00	1.00
#000000	3.19	21.00	1.00	21.00
##FFFFFF	6.59	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1161B7

Deuteranopia (green-blind)

#0059B2

Tritanopia (blue-blind)

#21687A

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #5151b4;
/* rgb */ color: rgb(81, 81, 180);
/* oklch */ color: oklch(49.0% 0.153 279.1);

Tailwind

colors: {
  custom: {
    50: '#8a82cb',
    500: '#5151b4',
    950: '#000000',
  },
}

SCSS

$custom: #5151b4;
$custom-light: #8a82cb;
$custom-dark: #000000;

JSON

{
  "hex": "#5151b4",
  "rgb": {
    "r": 81,
    "g": 81,
    "b": 180
  },
  "hsl": {
    "h": 240,
    "s": 39.759,
    "l": 51.176
  },
  "oklch": {
    "l": 0.48951,
    "c": 0.15309,
    "h": 279.1
  },
  "luminance": 0.10929
}

Semantic roles & 50–950 ramp

primary

#5151B4

secondary

#C6C69B

accent

#D058D0

background

#F8F7FC

surface

#F0EEF9

border

#CBC9D2

text

#0C0A13

muted

#7D7C82

Preview Lab

Preview with #5151B4

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

Preview Lab → · Contrast checker → · Palette generator →