#3666D2#3666D2

#3666D2 is a mid, vivid blue. Relative luminance 0.149; OKLCH L 53.8% C 0.175 H 263.6°. Best body text is #FFFFFF at 5.27:1 contrast (WCAG AA passes).

Color values

HEX	#3666D2
RGB	rgb(54, 102, 210)
HSL	hsl(222, 63%, 52%)
HSV	hsv(222, 74%, 82%)
CMYK	cmyk(74.3%, 51.4%, 0%, 17.6%)
CIE-LAB	lab(45.55, 21.31, -60.45)
CIE-LCH	lch(45.55, 64.09, 289.42°)
OKLab	oklab(53.8% -0.0196 -0.1739)
OKLCH	oklch(53.8% 0.175 263.6)
XYZ	xyz(17.9014, 14.9382, 62.9002)
Luminance	0.1494 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666D2 #D2A236

analogous

#36B4D2 #3666D2 #5436D2

triadic

#3666D2 #D23666 #66D236

tetradic

#3666D2 #D236B4 #D2A236 #36D254

square

#3666D2 #D236B4 #D2A236 #36D254

split-complementary

#3666D2 #D25436 #B4D236

monochromatic

#1A3674 #254DA6 #3666D2 #688CDD #9AB2E8

Accessibility & contrast

On white

5.27

#3666D2 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.99

#3666D2 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666D2

5.27:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666D2	#FFFFFF	#000000	##FFFFFF
##3666D2	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)

#1F73D6

Deuteranopia (green-blind)

#0065D0

Tritanopia (blue-blind)

#008092

Achromatopsia (no color)

#6C6C6C

Design tokens & code

CSS

--color: #3666d2;
/* rgb */ color: rgb(54, 102, 210);
/* oklch */ color: oklch(53.8% 0.175 263.6);

Tailwind

colors: {
  custom: {
    50: '#8291e0',
    500: '#3666d2',
    950: '#000000',
  },
}

SCSS

$custom: #3666d2;
$custom-light: #8291e0;
$custom-dark: #000000;

JSON

{
  "hex": "#3666d2",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 210
  },
  "hsl": {
    "h": 221.538,
    "s": 63.415,
    "l": 51.765
  },
  "oklch": {
    "l": 0.53803,
    "c": 0.17504,
    "h": 263.6
  },
  "luminance": 0.1494
}

Semantic roles & 50–950 ramp

primary

#3666D2

secondary

#D4BF90

accent

#B441E6

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3666D2

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

Preview Lab → · Contrast checker → · Palette generator →