#3B66CF#3B66CF

#3B66CF is a mid, vivid blue. Relative luminance 0.149; OKLCH L 53.8% C 0.170 H 264.6°. Best body text is #FFFFFF at 5.27:1 contrast (WCAG AA passes).

Color values

HEX	#3B66CF
RGB	rgb(59, 102, 207)
HSL	hsl(223, 61%, 52%)
HSV	hsv(223, 71%, 81%)
CMYK	cmyk(71.5%, 50.7%, 0%, 18.8%)
CIE-LAB	lab(45.55, 20.85, -58.73)
CIE-LCH	lch(45.55, 62.32, 289.55°)
OKLab	oklab(53.79% -0.016 -0.1688)
OKLCH	oklch(53.79% 0.17 264.6)
XYZ	xyz(17.8135, 14.9357, 60.9635)
Luminance	0.1494 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3B66CF #CFA43B

analogous

#3BB0CF #3B66CF #5A3BCF

triadic

#3B66CF #CF3B66 #66CF3B

tetradic

#3B66CF #CF3BB0 #CFA43B #3BCF5A

square

#3B66CF #CF3BB0 #CFA43B #3BCF5A

split-complementary

#3B66CF #CF5A3B #B0CF3B

monochromatic

#1C3673 #284CA5 #3B66CF #6C8CDB #9DB3E7

Accessibility & contrast

On white

5.27

#3B66CF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.99

#3B66CF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3B66CF

5.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3B66CF	#FFFFFF	#000000	##FFFFFF
##3B66CF	1.00	5.27	3.99	5.27
#FFFFFF	5.27	1.00	21.00	1.00
#000000	3.99	21.00	1.00	21.00
##FFFFFF	5.27	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2573D3

Deuteranopia (green-blind)

#0065CD

Tritanopia (blue-blind)

#007F91

Achromatopsia (no color)

#6C6C6C

Design tokens & code

CSS

--color: #3b66cf;
/* rgb */ color: rgb(59, 102, 207);
/* oklch */ color: oklch(53.8% 0.170 264.6);

Tailwind

colors: {
  custom: {
    50: '#8391de',
    500: '#3b66cf',
    950: '#000000',
  },
}

SCSS

$custom: #3b66cf;
$custom-light: #8391de;
$custom-dark: #000000;

JSON

{
  "hex": "#3b66cf",
  "rgb": {
    "r": 59,
    "g": 102,
    "b": 207
  },
  "hsl": {
    "h": 222.568,
    "s": 60.656,
    "l": 52.157
  },
  "oklch": {
    "l": 0.53791,
    "c": 0.16955,
    "h": 264.6
  },
  "luminance": 0.14938
}

Semantic roles & 50–950 ramp

primary

#3B66CF

secondary

#D3C093

accent

#B544E4

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3B66CF

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

Preview Lab → · Contrast checker → · Palette generator →