#3666C5#3666C5

#3666C5 is a mid, vivid blue. Relative luminance 0.143; OKLCH L 52.9% C 0.158 H 262.3°. Best body text is #FFFFFF at 5.44:1 contrast (WCAG AA passes).

Color values

HEX	#3666C5
RGB	rgb(54, 102, 197)
HSL	hsl(220, 57%, 49%)
HSV	hsv(220, 73%, 77%)
CMYK	cmyk(72.6%, 48.2%, 0%, 22.7%)
CIE-LAB	lab(44.68, 16.49, -54.38)
CIE-LCH	lch(44.68, 56.82, 286.87°)
OKLab	oklab(52.87% -0.0212 -0.1561)
OKLCH	oklch(52.87% 0.158 262.3)
XYZ	xyz(16.3471, 14.3165, 54.7143)
Luminance	0.1432 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666C5 #C59536

analogous

#36AEC5 #3666C5 #4E36C5

triadic

#3666C5 #C53666 #66C536

tetradic

#3666C5 #C536AE #C59536 #36C54E

square

#3666C5 #C536AE #C59536 #36C54E

split-complementary

#3666C5 #C54E36 #AEC536

monochromatic

#1C3465 #294D95 #3666C5 #648AD4 #94AEE2

Accessibility & contrast

On white

5.44

#3666C5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.86

#3666C5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666C5

5.44:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666C5	#FFFFFF	#000000	##FFFFFF
##3666C5	1.00	5.44	3.86	5.44
#FFFFFF	5.44	1.00	21.00	1.00
#000000	3.86	21.00	1.00	21.00
##FFFFFF	5.44	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3171C9

Deuteranopia (green-blind)

#0264C3

Tritanopia (blue-blind)

#007C8C

Achromatopsia (no color)

#6A6A6A

Design tokens & code

CSS

--color: #3666c5;
/* rgb */ color: rgb(54, 102, 197);
/* oklch */ color: oklch(52.9% 0.158 262.3);

Tailwind

colors: {
  custom: {
    50: '#7f91d7',
    500: '#3666c5',
    950: '#000000',
  },
}

SCSS

$custom: #3666c5;
$custom-light: #7f91d7;
$custom-dark: #000000;

JSON

{
  "hex": "#3666c5",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 197
  },
  "hsl": {
    "h": 219.86,
    "s": 56.972,
    "l": 49.216
  },
  "oklch": {
    "l": 0.52866,
    "c": 0.15752,
    "h": 262.3
  },
  "luminance": 0.14318
}

Semantic roles & 50–950 ramp

primary

#3666C5

secondary

#CDB68A

accent

#AD48E0

background

#F8F8FD

surface

#F0F0FA

border

#CBCBD3

text

#0B0C14

muted

#7C7D83

Preview Lab

Preview with #3666C5

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

Preview Lab → · Contrast checker → · Palette generator →