#51639B#51639B

#51639B is a mid, moderate blue. Relative luminance 0.130; OKLCH L 51.0% C 0.092 H 269.4°. Best body text is #FFFFFF at 5.82:1 contrast (WCAG AA passes).

Color values

HEX	#51639B
RGB	rgb(81, 99, 155)
HSL	hsl(225, 31%, 46%)
HSV	hsv(225, 48%, 61%)
CMYK	cmyk(47.7%, 36.1%, 0%, 39.2%)
CIE-LAB	lab(42.82, 9.06, -32.65)
CIE-LCH	lch(42.82, 33.88, 285.51°)
OKLab	oklab(51.03% -0.0009 -0.0919)
OKLCH	oklch(51.03% 0.092 269.4)
XYZ	xyz(13.7697, 13.0388, 32.7952)
Luminance	0.1304 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#51639B #9B8951

analogous

#51889B #51639B #64519B

triadic

#51639B #9B5163 #639B51

tetradic

#51639B #9B5188 #9B8951 #519B64

square

#51639B #9B5188 #9B8951 #519B64

split-complementary

#51639B #9B6451 #889B51

monochromatic

#27304B #3C4973 #51639B #7383B6 #9BA7CB

Accessibility & contrast

On white

5.82

#51639B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.61

#51639B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #51639B

5.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##51639B	#FFFFFF	#000000	##FFFFFF
##51639B	1.00	5.82	3.61	5.82
#FFFFFF	5.82	1.00	21.00	1.00
#000000	3.61	21.00	1.00	21.00
##FFFFFF	5.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4E699D

Deuteranopia (green-blind)

#47629A

Tritanopia (blue-blind)

#356F78

Achromatopsia (no color)

#656565

Design tokens & code

CSS

--color: #51639b;
/* rgb */ color: rgb(81, 99, 155);
/* oklch */ color: oklch(51.0% 0.092 269.4);

Tailwind

colors: {
  custom: {
    50: '#868fb9',
    500: '#51639b',
    950: '#000000',
  },
}

SCSS

$custom: #51639b;
$custom-light: #868fb9;
$custom-dark: #000000;

JSON

{
  "hex": "#51639b",
  "rgb": {
    "r": 81,
    "g": 99,
    "b": 155
  },
  "hsl": {
    "h": 225.405,
    "s": 31.356,
    "l": 46.275
  },
  "oklch": {
    "l": 0.51026,
    "c": 0.09191,
    "h": 269.4
  },
  "luminance": 0.1304
}

Semantic roles & 50–950 ramp

primary

#51639B

secondary

#B8AE90

accent

#AE60C8

background

#F8F8FB

surface

#F0F0F6

border

#CBCBD0

text

#0B0C11

muted

#7C7D80

Preview Lab

Preview with #51639B

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

Preview Lab → · Contrast checker → · Palette generator →