#3663BB#3663BB

#3663BB is a mid, vivid blue. Relative luminance 0.133; OKLCH L 51.5% C 0.147 H 262.2°. Best body text is #FFFFFF at 5.74:1 contrast (WCAG AA passes).

Color values

HEX	#3663BB
RGB	rgb(54, 99, 187)
HSL	hsl(220, 55%, 47%)
HSV	hsv(220, 71%, 73%)
CMYK	cmyk(71.1%, 47.1%, 0%, 26.7%)
CIE-LAB	lab(43.20, 14.71, -50.96)
CIE-LCH	lch(43.20, 53.04, 286.10°)
OKLab	oklab(51.53% -0.0201 -0.1461)
OKLCH	oklch(51.53% 0.147 262.2)
XYZ	xyz(14.9496, 13.2942, 48.7822)
Luminance	0.1330 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3663BB #BB8E36

analogous

#36A6BB #3663BB #4B36BB

triadic

#3663BB #BB3663 #63BB36

tetradic

#3663BB #BB36A6 #BB8E36 #36BB4B

square

#3663BB #BB36A6 #BB8E36 #36BB4B

split-complementary

#3663BB #BB4B36 #A6BB36

monochromatic

#1B315C #284A8C #3663BB #5E85D0 #8DA9DE

Accessibility & contrast

On white

5.74

#3663BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.66

#3663BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3663BB

5.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3663BB	#FFFFFF	#000000	##FFFFFF
##3663BB	1.00	5.74	3.66	5.74
#FFFFFF	5.74	1.00	21.00	1.00
#000000	3.66	21.00	1.00	21.00
##FFFFFF	5.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#356DBE

Deuteranopia (green-blind)

#1560B9

Tritanopia (blue-blind)

#007886

Achromatopsia (no color)

#666666

Design tokens & code

CSS

--color: #3663bb;
/* rgb */ color: rgb(54, 99, 187);
/* oklch */ color: oklch(51.5% 0.147 262.2);

Tailwind

colors: {
  custom: {
    50: '#7d8ed0',
    500: '#3663bb',
    950: '#000000',
  },
}

SCSS

$custom: #3663bb;
$custom-light: #7d8ed0;
$custom-dark: #000000;

JSON

{
  "hex": "#3663bb",
  "rgb": {
    "r": 54,
    "g": 99,
    "b": 187
  },
  "hsl": {
    "h": 219.699,
    "s": 55.187,
    "l": 47.255
  },
  "oklch": {
    "l": 0.51526,
    "c": 0.14746,
    "h": 262.2
  },
  "luminance": 0.13296
}

Semantic roles & 50–950 ramp

primary

#3663BB

secondary

#C9B184

accent

#AC49DF

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3663BB

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

Preview Lab → · Contrast checker → · Palette generator →