#3666C4#3666C4

#3666C4 is a mid, vivid blue. Relative luminance 0.143; OKLCH L 52.8% C 0.156 H 262.1°. Best body text is #FFFFFF at 5.45:1 contrast (WCAG AA passes).

Color values

HEX	#3666C4
RGB	rgb(54, 102, 196)
HSL	hsl(220, 57%, 49%)
HSV	hsv(220, 72%, 77%)
CMYK	cmyk(72.4%, 48%, 0%, 23.1%)
CIE-LAB	lab(44.62, 16.12, -53.90)
CIE-LCH	lch(44.62, 56.26, 286.65°)
OKLab	oklab(52.8% -0.0214 -0.1547)
OKLCH	oklch(52.8% 0.156 262.1)
XYZ	xyz(16.2329, 14.2708, 54.1129)
Luminance	0.1427 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666C4 #C49436

analogous

#36ADC4 #3666C4 #4D36C4

triadic

#3666C4 #C43666 #66C436

tetradic

#3666C4 #C436AD #C49436 #36C44D

square

#3666C4 #C436AD #C49436 #36C44D

split-complementary

#3666C4 #C44D36 #ADC436

monochromatic

#1C3464 #294D94 #3666C4 #6389D4 #93AEE1

Accessibility & contrast

On white

5.45

#3666C4 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.85

#3666C4 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666C4

5.45:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666C4	#FFFFFF	#000000	##FFFFFF
##3666C4	1.00	5.45	3.85	5.45
#FFFFFF	5.45	1.00	21.00	1.00
#000000	3.85	21.00	1.00	21.00
##FFFFFF	5.45	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3270C7

Deuteranopia (green-blind)

#0763C2

Tritanopia (blue-blind)

#007C8B

Achromatopsia (no color)

#6A6A6A

Design tokens & code

CSS

--color: #3666c4;
/* rgb */ color: rgb(54, 102, 196);
/* oklch */ color: oklch(52.8% 0.156 262.1);

Tailwind

colors: {
  custom: {
    50: '#7f91d6',
    500: '#3666c4',
    950: '#000000',
  },
}

SCSS

$custom: #3666c4;
$custom-light: #7f91d6;
$custom-dark: #000000;

JSON

{
  "hex": "#3666c4",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 196
  },
  "hsl": {
    "h": 219.718,
    "s": 56.8,
    "l": 49.02
  },
  "oklch": {
    "l": 0.52796,
    "c": 0.15615,
    "h": 262.1
  },
  "luminance": 0.14273
}

Semantic roles & 50–950 ramp

primary

#3666C4

secondary

#CCB689

accent

#AD48E0

background

#F8F8FD

surface

#F0F0FA

border

#CBCBD3

text

#0B0C14

muted

#7C7D83

Preview Lab

Preview with #3666C4

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

Preview Lab → · Contrast checker → · Palette generator →