#3666C6#3666C6

#3666C6 is a mid, vivid blue. Relative luminance 0.144; OKLCH L 52.9% C 0.159 H 262.4°. Best body text is #FFFFFF at 5.42:1 contrast (WCAG AA passes).

Color values

HEX	#3666C6
RGB	rgb(54, 102, 198)
HSL	hsl(220, 57%, 49%)
HSV	hsv(220, 73%, 78%)
CMYK	cmyk(72.7%, 48.5%, 0%, 22.4%)
CIE-LAB	lab(44.75, 16.86, -54.85)
CIE-LCH	lch(44.75, 57.38, 287.09°)
OKLab	oklab(52.94% -0.0211 -0.1575)
OKLCH	oklch(52.94% 0.159 262.4)
XYZ	xyz(16.4621, 14.3625, 55.3198)
Luminance	0.1436 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666C6 #C69636

analogous

#36AEC6 #3666C6 #4E36C6

triadic

#3666C6 #C63666 #66C636

tetradic

#3666C6 #C636AE #C69636 #36C64E

square

#3666C6 #C636AE #C69636 #36C64E

split-complementary

#3666C6 #C64E36 #AEC636

monochromatic

#1C3466 #294D96 #3666C6 #648AD5 #94AEE2

Accessibility & contrast

On white

5.42

#3666C6 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.87

#3666C6 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666C6

5.42:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666C6	#FFFFFF	#000000	##FFFFFF
##3666C6	1.00	5.42	3.87	5.42
#FFFFFF	5.42	1.00	21.00	1.00
#000000	3.87	21.00	1.00	21.00
##FFFFFF	5.42	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3071CA

Deuteranopia (green-blind)

#0064C4

Tritanopia (blue-blind)

#007D8C

Achromatopsia (no color)

#6A6A6A

Design tokens & code

CSS

--color: #3666c6;
/* rgb */ color: rgb(54, 102, 198);
/* oklch */ color: oklch(52.9% 0.159 262.4);

Tailwind

colors: {
  custom: {
    50: '#7f91d8',
    500: '#3666c6',
    950: '#000000',
  },
}

SCSS

$custom: #3666c6;
$custom-light: #7f91d8;
$custom-dark: #000000;

JSON

{
  "hex": "#3666c6",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 198
  },
  "hsl": {
    "h": 220,
    "s": 57.143,
    "l": 49.412
  },
  "oklch": {
    "l": 0.52937,
    "c": 0.15888,
    "h": 262.4
  },
  "luminance": 0.14364
}

Semantic roles & 50–950 ramp

primary

#3666C6

secondary

#CDB78B

accent

#AD47E0

background

#F8F8FD

surface

#F0F0FA

border

#CBCBD3

text

#0B0C14

muted

#7C7D83

Preview Lab

Preview with #3666C6

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

Preview Lab → · Contrast checker → · Palette generator →