#5151BB#5151BB

#5151BB is a mid, vivid blue. Relative luminance 0.112; OKLCH L 49.5% C 0.163 H 278.6°. Best body text is #FFFFFF at 6.47:1 contrast (WCAG AA passes).

Color values

HEX	#5151BB
RGB	rgb(81, 81, 187)
HSL	hsl(240, 44%, 53%)
HSV	hsv(240, 57%, 73%)
CMYK	cmyk(56.7%, 56.7%, 0%, 26.7%)
CIE-LAB	lab(39.95, 30.84, -56.13)
CIE-LCH	lch(39.95, 64.05, 298.79°)
OKLab	oklab(49.47% 0.0245 -0.1609)
OKLCH	oklch(49.47% 0.163 278.6)
XYZ	xyz(15.3026, 11.2210, 48.3636)
Luminance	0.1122 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5151BB #BBBB51

analogous

#5186BB #5151BB #8651BB

triadic

#5151BB #BB5151 #51BB51

tetradic

#5151BB #BB5186 #BBBB51 #51BB86

square

#5151BB #BB5186 #BBBB51 #51BB86

split-complementary

#5151BB #BB8651 #86BB51

monochromatic

#292969 #3A3A95 #5151BB #7D7DCC #A9A9DD

Accessibility & contrast

On white

6.47

#5151BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.24

#5151BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5151BB

6.47:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5151BB	#FFFFFF	#000000	##FFFFFF
##5151BB	1.00	6.47	3.24	6.47
#FFFFFF	6.47	1.00	21.00	1.00
#000000	3.24	21.00	1.00	21.00
##FFFFFF	6.47	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0062BF

Deuteranopia (green-blind)

#005AB9

Tritanopia (blue-blind)

#166A7E

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #5151bb;
/* rgb */ color: rgb(81, 81, 187);
/* oklch */ color: oklch(49.5% 0.163 278.6);

Tailwind

colors: {
  custom: {
    50: '#8b82d0',
    500: '#5151bb',
    950: '#000000',
  },
}

SCSS

$custom: #5151bb;
$custom-light: #8b82d0;
$custom-dark: #000000;

JSON

{
  "hex": "#5151bb",
  "rgb": {
    "r": 81,
    "g": 81,
    "b": 187
  },
  "hsl": {
    "h": 240,
    "s": 43.802,
    "l": 52.549
  },
  "oklch": {
    "l": 0.49472,
    "c": 0.16276,
    "h": 278.6
  },
  "luminance": 0.11222
}

Semantic roles & 50–950 ramp

primary

#5151BB

secondary

#CBCB9D

accent

#D454D4

background

#F9F7FC

surface

#F1EEF9

border

#CBC9D2

text

#0D0A14

muted

#7E7C82

Preview Lab

Preview with #5151BB

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

Preview Lab → · Contrast checker → · Palette generator →