#3666CD#3666CD

#3666CD is a mid, vivid blue. Relative luminance 0.147; OKLCH L 53.4% C 0.168 H 263.1°. Best body text is #FFFFFF at 5.33:1 contrast (WCAG AA passes).

Color values

HEX	#3666CD
RGB	rgb(54, 102, 205)
HSL	hsl(221, 60%, 51%)
HSV	hsv(221, 74%, 80%)
CMYK	cmyk(73.7%, 50.2%, 0%, 19.6%)
CIE-LAB	lab(45.21, 19.46, -58.13)
CIE-LCH	lch(45.21, 61.30, 288.51°)
OKLab	oklab(53.44% -0.0202 -0.1671)
OKLCH	oklch(53.44% 0.168 263.1)
XYZ	xyz(17.2882, 14.6929, 59.6707)
Luminance	0.1469 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666CD #CD9D36

analogous

#36B1CD #3666CD #5136CD

triadic

#3666CD #CD3666 #66CD36

tetradic

#3666CD #CD36B1 #CD9D36 #36CD51

square

#3666CD #CD36B1 #CD9D36 #36CD51

split-complementary

#3666CD #CD5136 #B1CD36

monochromatic

#1B356D #274D9E #3666CD #678BD9 #98B1E5

Accessibility & contrast

On white

5.33

#3666CD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.94

#3666CD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666CD

5.33:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666CD	#FFFFFF	#000000	##FFFFFF
##3666CD	1.00	5.33	3.94	5.33
#FFFFFF	5.33	1.00	21.00	1.00
#000000	3.94	21.00	1.00	21.00
##FFFFFF	5.33	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#2772D1

Deuteranopia (green-blind)

#0064CB

Tritanopia (blue-blind)

#007F90

Achromatopsia (no color)

#6B6B6B

Design tokens & code

CSS

--color: #3666cd;
/* rgb */ color: rgb(54, 102, 205);
/* oklch */ color: oklch(53.4% 0.168 263.1);

Tailwind

colors: {
  custom: {
    50: '#8191dd',
    500: '#3666cd',
    950: '#000000',
  },
}

SCSS

$custom: #3666cd;
$custom-light: #8191dd;
$custom-dark: #000000;

JSON

{
  "hex": "#3666cd",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 205
  },
  "hsl": {
    "h": 220.927,
    "s": 60.159,
    "l": 50.784
  },
  "oklch": {
    "l": 0.53438,
    "c": 0.16833,
    "h": 263.1
  },
  "luminance": 0.14695
}

Semantic roles & 50–950 ramp

primary

#3666CD

secondary

#D1BC8E

accent

#B144E3

background

#F8F8FD

surface

#F0F0FB

border

#CBCBD4

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3666CD

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

Preview Lab → · Contrast checker → · Palette generator →