#645B9B#645B9B

#645B9B is a mid, moderate blue. Relative luminance 0.126; OKLCH L 50.8% C 0.100 H 288.8°. Best body text is #FFFFFF at 5.98:1 contrast (WCAG AA passes).

Color values

HEX	#645B9B
RGB	rgb(100, 91, 155)
HSL	hsl(248, 26%, 48%)
HSV	hsv(248, 41%, 61%)
CMYK	cmyk(35.5%, 41.3%, 0%, 39.2%)
CIE-LAB	lab(42.09, 19.28, -33.70)
CIE-LCH	lch(42.09, 38.83, 299.78°)
OKLab	oklab(50.83% 0.0322 -0.0946)
OKLCH	oklch(50.83% 0.1 288.8)
XYZ	xyz(14.9114, 12.5577, 32.6422)
Luminance	0.1256 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#645B9B #929B5B

analogous

#5B729B #645B9B #845B9B

triadic

#645B9B #9B645B #5B9B64

tetradic

#645B9B #9B5B72 #929B5B #5B9B84

square

#645B9B #9B5B72 #929B5B #5B9B84

split-complementary

#645B9B #9B845B #729B5B

monochromatic

#322E4E #4B4474 #645B9B #877FB4 #ABA6CB

Accessibility & contrast

On white

5.98

#645B9B on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.51

#645B9B on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #645B9B

5.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##645B9B	#FFFFFF	#000000	##FFFFFF
##645B9B	1.00	5.98	3.51	5.98
#FFFFFF	5.98	1.00	21.00	1.00
#000000	3.51	21.00	1.00	21.00
##FFFFFF	5.98	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#47659D

Deuteranopia (green-blind)

#476299

Tritanopia (blue-blind)

#566773

Achromatopsia (no color)

#636363

Design tokens & code

CSS

--color: #645b9b;
/* rgb */ color: rgb(100, 91, 155);
/* oklch */ color: oklch(50.8% 0.100 288.8);

Tailwind

colors: {
  custom: {
    50: '#9289b9',
    500: '#645b9b',
    950: '#000000',
  },
}

SCSS

$custom: #645b9b;
$custom-light: #9289b9;
$custom-dark: #000000;

JSON

{
  "hex": "#645b9b",
  "rgb": {
    "r": 100,
    "g": 91,
    "b": 155
  },
  "hsl": {
    "h": 248.438,
    "s": 26.016,
    "l": 48.235
  },
  "oklch": {
    "l": 0.50834,
    "c": 0.09991,
    "h": 288.8
  },
  "luminance": 0.12558
}

Semantic roles & 50–950 ramp

primary

#645B9B

secondary

#B4B999

accent

#C265B5

background

#F9F8FB

surface

#F1F0F6

border

#CBCBD0

text

#0D0B11

muted

#7E7C80

Preview Lab

Preview with #645B9B

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

Preview Lab → · Contrast checker → · Palette generator →