#5B66CC#5B66CC

#5B66CC is a mid, vivid blue. Relative luminance 0.161; OKLCH L 55.4% C 0.156 H 275.4°. Best body text is #FFFFFF at 4.98:1 contrast (WCAG AA passes).

Color values

HEX	#5B66CC
RGB	rgb(91, 102, 204)
HSL	hsl(234, 53%, 58%)
HSV	hsv(234, 55%, 80%)
CMYK	cmyk(55.4%, 50%, 0%, 20%)
CIE-LAB	lab(47.09, 25.28, -54.44)
CIE-LCH	lch(47.09, 60.02, 294.91°)
OKLab	oklab(55.36% 0.0148 -0.1555)
OKLCH	oklch(55.36% 0.156 275.4)
XYZ	xyz(19.9613, 16.0851, 59.1679)
Luminance	0.1609 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#5B66CC #CCC15B

analogous

#5B9FCC #5B66CC #885BCC

triadic

#5B66CC #CC5B66 #66CC5B

tetradic

#5B66CC #CC5B9F #CCC15B #5BCC88

square

#5B66CC #CC5B9F #CCC15B #5BCC88

split-complementary

#5B66CC #CC885B #9FCC5B

monochromatic

#293284 #3743B2 #5B66CC #8A92DB #B8BDE9

Accessibility & contrast

On white

4.98

#5B66CC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.22

#5B66CC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #5B66CC

4.98:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##5B66CC	#FFFFFF	#000000	##FFFFFF
##5B66CC	1.00	4.98	4.22	4.98
#FFFFFF	4.98	1.00	21.00	1.00
#000000	4.22	21.00	1.00	21.00
##FFFFFF	4.98	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3275D0

Deuteranopia (green-blind)

#216BCA

Tritanopia (blue-blind)

#1E7D8F

Achromatopsia (no color)

#707070

Design tokens & code

CSS

--color: #5b66cc;
/* rgb */ color: rgb(91, 102, 204);
/* oklch */ color: oklch(55.4% 0.156 275.4);

Tailwind

colors: {
  custom: {
    50: '#9291dc',
    500: '#5b66cc',
    950: '#000000',
  },
}

SCSS

$custom: #5b66cc;
$custom-light: #9291dc;
$custom-dark: #000000;

JSON

{
  "hex": "#5b66cc",
  "rgb": {
    "r": 91,
    "g": 102,
    "b": 204
  },
  "hsl": {
    "h": 234.159,
    "s": 52.558,
    "l": 57.843
  },
  "oklch": {
    "l": 0.55359,
    "c": 0.15618,
    "h": 275.4
  },
  "luminance": 0.16087
}

Semantic roles & 50–950 ramp

primary

#5B66CC

secondary

#D8D4AB

accent

#CE4CDC

background

#F9F8FD

surface

#F2F0FB

border

#CCCBD4

text

#0E0C15

muted

#7E7D83

Preview Lab

Preview with #5B66CC

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

Preview Lab → · Contrast checker → · Palette generator →