#3666DB#3666DB

#3666DB is a mid, vivid blue. Relative luminance 0.154; OKLCH L 54.5% C 0.187 H 264.2°. Best body text is #FFFFFF at 5.15:1 contrast (WCAG AA passes).

Color values

HEX	#3666DB
RGB	rgb(54, 102, 219)
HSL	hsl(223, 70%, 54%)
HSV	hsv(223, 75%, 86%)
CMYK	cmyk(75.3%, 53.4%, 0%, 14.1%)
CIE-LAB	lab(46.18, 24.63, -64.56)
CIE-LCH	lch(46.18, 69.10, 290.88°)
OKLab	oklab(54.48% -0.0187 -0.186)
OKLCH	oklch(54.48% 0.187 264.2)
XYZ	xyz(19.0543, 15.3993, 68.9722)
Luminance	0.1540 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666DB #DBAB36

analogous

#36B9DB #3666DB #5836DB

triadic

#3666DB #DB3666 #66DB36

tetradic

#3666DB #DB36B9 #DBAB36 #36DB58

square

#3666DB #DB36B9 #DBAB36 #36DB58

split-complementary

#3666DB #DB5836 #B9DB36

monochromatic

#173580 #204BB4 #3666DB #6A8EE4 #9EB5EE

Accessibility & contrast

On white

5.15

#3666DB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.08

#3666DB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666DB

5.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666DB	#FFFFFF	#000000	##FFFFFF
##3666DB	1.00	5.15	4.08	5.15
#FFFFFF	5.15	1.00	21.00	1.00
#000000	4.08	21.00	1.00	21.00
##FFFFFF	5.15	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0175DF

Deuteranopia (green-blind)

#0066D9

Tritanopia (blue-blind)

#008397

Achromatopsia (no color)

#6D6D6D

Design tokens & code

CSS

--color: #3666db;
/* rgb */ color: rgb(54, 102, 219);
/* oklch */ color: oklch(54.5% 0.187 264.2);

Tailwind

colors: {
  custom: {
    50: '#8491e7',
    500: '#3666db',
    950: '#000000',
  },
}

SCSS

$custom: #3666db;
$custom-light: #8491e7;
$custom-dark: #000000;

JSON

{
  "hex": "#3666db",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 219
  },
  "hsl": {
    "h": 222.545,
    "s": 69.62,
    "l": 53.529
  },
  "oklch": {
    "l": 0.54478,
    "c": 0.18699,
    "h": 264.2
  },
  "luminance": 0.15401
}

Semantic roles & 50–950 ramp

primary

#3666DB

secondary

#DAC593

accent

#B93BEC

background

#F8F8FE

surface

#F0F0FC

border

#CBCBD5

text

#0C0C16

muted

#7D7D84

Preview Lab

Preview with #3666DB

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

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