#5151B2#5151B2

#5151B2 is a mid, vivid blue. Relative luminance 0.108; OKLCH L 48.8% C 0.150 H 279.3°. Best body text is #FFFFFF at 6.63:1 contrast (WCAG AA passes).

Color values

HEX	#5151B2
RGB	rgb(81, 81, 178)
HSL	hsl(240, 39%, 51%)
HSV	hsv(240, 54%, 70%)
CMYK	cmyk(54.5%, 54.5%, 0%, 30.2%)
CIE-LAB	lab(39.32, 27.90, -51.86)
CIE-LCH	lch(39.32, 58.89, 298.28°)
OKLab	oklab(48.81% 0.0242 -0.1483)
OKLCH	oklch(48.81% 0.15 279.3)
XYZ	xyz(14.3691, 10.8476, 43.4475)
Luminance	0.1085 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5151B2 #B2B251

analogous

#5181B2 #5151B2 #8151B2

triadic

#5151B2 #B25151 #51B251

tetradic

#5151B2 #B25181 #B2B251 #51B281

square

#5151B2 #B25181 #B2B251 #51B281

split-complementary

#5151B2 #B28151 #81B251

monochromatic

#2A2A5F #3D3D89 #5151B2 #7B7BC5 #A6A6D8

Accessibility & contrast

On white

6.63

#5151B2 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.17

#5151B2 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5151B2

6.63:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5151B2	#FFFFFF	#000000	##FFFFFF
##5151B2	1.00	6.63	3.17	6.63
#FFFFFF	6.63	1.00	21.00	1.00
#000000	3.17	21.00	1.00	21.00
##FFFFFF	6.63	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1661B5

Deuteranopia (green-blind)

#0059B0

Tritanopia (blue-blind)

#246779

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #5151b2;
/* rgb */ color: rgb(81, 81, 178);
/* oklch */ color: oklch(48.8% 0.150 279.3);

Tailwind

colors: {
  custom: {
    50: '#8a82ca',
    500: '#5151b2',
    950: '#000000',
  },
}

SCSS

$custom: #5151b2;
$custom-light: #8a82ca;
$custom-dark: #000000;

JSON

{
  "hex": "#5151b2",
  "rgb": {
    "r": 81,
    "g": 81,
    "b": 178
  },
  "hsl": {
    "h": 240,
    "s": 38.645,
    "l": 50.784
  },
  "oklch": {
    "l": 0.48805,
    "c": 0.1503,
    "h": 279.3
  },
  "luminance": 0.10849
}

Semantic roles & 50–950 ramp

primary

#5151B2

secondary

#C5C59A

accent

#CF59CF

background

#F8F7FC

surface

#F0EEF8

border

#CBC9D1

text

#0C0A13

muted

#7D7C82

Preview Lab

Preview with #5151B2

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

Preview Lab → · Contrast checker → · Palette generator →