#5151B5#5151B5

#5151B5 is a mid, vivid blue. Relative luminance 0.110; OKLCH L 49.0% C 0.154 H 279.1°. Best body text is #FFFFFF at 6.57:1 contrast (WCAG AA passes).

Color values

HEX	#5151B5
RGB	rgb(81, 81, 181)
HSL	hsl(240, 40%, 51%)
HSV	hsv(240, 55%, 71%)
CMYK	cmyk(55.2%, 55.2%, 0%, 29%)
CIE-LAB	lab(39.53, 28.88, -53.29)
CIE-LCH	lch(39.53, 60.61, 298.45°)
OKLab	oklab(49.02% 0.0243 -0.1526)
OKLCH	oklch(49.02% 0.154 279.1)
XYZ	xyz(14.6736, 10.9694, 45.0512)
Luminance	0.1097 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5151B5 #B5B551

analogous

#5183B5 #5151B5 #8351B5

triadic

#5151B5 #B55151 #51B551

tetradic

#5151B5 #B55183 #B5B551 #51B583

square

#5151B5 #B55183 #B5B551 #51B583

split-complementary

#5151B5 #B58351 #83B551

monochromatic

#2A2A62 #3C3C8D #5151B5 #7C7CC7 #A7A7DA

Accessibility & contrast

On white

6.57

#5151B5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.19

#5151B5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5151B5

6.57:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5151B5	#FFFFFF	#000000	##FFFFFF
##5151B5	1.00	6.57	3.19	6.57
#FFFFFF	6.57	1.00	21.00	1.00
#000000	3.19	21.00	1.00	21.00
##FFFFFF	6.57	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0E61B8

Deuteranopia (green-blind)

#0059B3

Tritanopia (blue-blind)

#20687B

Achromatopsia (no color)

#5D5D5D

Design tokens & code

CSS

--color: #5151b5;
/* rgb */ color: rgb(81, 81, 181);
/* oklch */ color: oklch(49.0% 0.154 279.1);

Tailwind

colors: {
  custom: {
    50: '#8a82cc',
    500: '#5151b5',
    950: '#000000',
  },
}

SCSS

$custom: #5151b5;
$custom-light: #8a82cc;
$custom-dark: #000000;

JSON

{
  "hex": "#5151b5",
  "rgb": {
    "r": 81,
    "g": 81,
    "b": 181
  },
  "hsl": {
    "h": 240,
    "s": 40.323,
    "l": 51.373
  },
  "oklch": {
    "l": 0.49024,
    "c": 0.15449,
    "h": 279.1
  },
  "luminance": 0.1097
}

Semantic roles & 50–950 ramp

primary

#5151B5

secondary

#C7C79B

accent

#D058D0

background

#F8F7FC

surface

#F0EEF9

border

#CBC9D2

text

#0C0A13

muted

#7D7C82

Preview Lab

Preview with #5151B5

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

Preview Lab → · Contrast checker → · Palette generator →