#3663C7#3663C7

#3663C7 is a mid, vivid blue. Relative luminance 0.138; OKLCH L 52.4% C 0.164 H 263.5°. Best body text is #FFFFFF at 5.58:1 contrast (WCAG AA passes).

Color values

HEX	#3663C7
RGB	rgb(54, 99, 199)
HSL	hsl(221, 57%, 50%)
HSV	hsv(221, 73%, 78%)
CMYK	cmyk(72.9%, 50.3%, 0%, 22%)
CIE-LAB	lab(43.99, 19.16, -56.65)
CIE-LCH	lch(43.99, 59.81, 288.68°)
OKLab	oklab(52.38% -0.0184 -0.1628)
OKLCH	oklch(52.38% 0.164 263.5)
XYZ	xyz(16.2883, 13.8297, 55.8327)
Luminance	0.1383 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3663C7 #C79A36

analogous

#36ACC7 #3663C7 #5136C7

triadic

#3663C7 #C73663 #63C736

tetradic

#3663C7 #C736AC #C79A36 #36C751

square

#3663C7 #C736AC #C79A36 #36C751

split-complementary

#3663C7 #C75136 #ACC736

monochromatic

#1C3367 #294B97 #3663C7 #6588D5 #95ADE2

Accessibility & contrast

On white

5.58

#3663C7 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.77

#3663C7 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3663C7

5.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3663C7	#FFFFFF	#000000	##FFFFFF
##3663C7	1.00	5.58	3.77	5.58
#FFFFFF	5.58	1.00	21.00	1.00
#000000	3.77	21.00	1.00	21.00
##FFFFFF	5.58	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#276FCB

Deuteranopia (green-blind)

#0062C5

Tritanopia (blue-blind)

#007B8B

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3663c7;
/* rgb */ color: rgb(54, 99, 199);
/* oklch */ color: oklch(52.4% 0.164 263.5);

Tailwind

colors: {
  custom: {
    50: '#808ed9',
    500: '#3663c7',
    950: '#000000',
  },
}

SCSS

$custom: #3663c7;
$custom-light: #808ed9;
$custom-dark: #000000;

JSON

{
  "hex": "#3663c7",
  "rgb": {
    "r": 54,
    "g": 99,
    "b": 199
  },
  "hsl": {
    "h": 221.379,
    "s": 57.312,
    "l": 49.608
  },
  "oklch": {
    "l": 0.52377,
    "c": 0.16386,
    "h": 263.5
  },
  "luminance": 0.13831
}

Semantic roles & 50–950 ramp

primary

#3663C7

secondary

#CEB98B

accent

#B147E1

background

#F8F8FD

surface

#F0F0FA

border

#CBCBD3

text

#0C0C15

muted

#7D7D83

Preview Lab

Preview with #3663C7

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

Preview Lab → · Contrast checker → · Palette generator →