#3661BB#3661BB

#3661BB is a mid, vivid blue. Relative luminance 0.129; OKLCH L 51.1% C 0.150 H 263.0°. Best body text is #FFFFFF at 5.86:1 contrast (WCAG AA passes).

Color values

HEX	#3661BB
RGB	rgb(54, 97, 187)
HSL	hsl(221, 55%, 47%)
HSV	hsv(221, 71%, 73%)
CMYK	cmyk(71.1%, 48.1%, 0%, 26.7%)
CIE-LAB	lab(42.64, 16.00, -51.86)
CIE-LCH	lch(42.64, 54.28, 287.14°)
OKLab	oklab(51.1% -0.0183 -0.1488)
OKLCH	oklch(51.1% 0.15 263)
XYZ	xyz(14.7625, 12.9200, 48.7199)
Luminance	0.1292 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3661BB #BB9036

analogous

#36A3BB #3661BB #4E36BB

triadic

#3661BB #BB3661 #61BB36

tetradic

#3661BB #BB36A3 #BB9036 #36BB4E

square

#3661BB #BB36A3 #BB9036 #36BB4E

split-complementary

#3661BB #BB4E36 #A3BB36

monochromatic

#1B305C #28488C #3661BB #5E83D0 #8DA7DE

Accessibility & contrast

On white

5.86

#3661BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.58

#3661BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3661BB

5.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3661BB	#FFFFFF	#000000	##FFFFFF
##3661BB	1.00	5.86	3.58	5.86
#FFFFFF	5.86	1.00	21.00	1.00
#000000	3.58	21.00	1.00	21.00
##FFFFFF	5.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#306BBE

Deuteranopia (green-blind)

#0A5FB9

Tritanopia (blue-blind)

#007685

Achromatopsia (no color)

#656565

Design tokens & code

CSS

--color: #3661bb;
/* rgb */ color: rgb(54, 97, 187);
/* oklch */ color: oklch(51.1% 0.150 263.0);

Tailwind

colors: {
  custom: {
    50: '#7d8dd0',
    500: '#3661bb',
    950: '#000000',
  },
}

SCSS

$custom: #3661bb;
$custom-light: #7d8dd0;
$custom-dark: #000000;

JSON

{
  "hex": "#3661bb",
  "rgb": {
    "r": 54,
    "g": 97,
    "b": 187
  },
  "hsl": {
    "h": 220.602,
    "s": 55.187,
    "l": 47.255
  },
  "oklch": {
    "l": 0.51096,
    "c": 0.14988,
    "h": 263
  },
  "luminance": 0.12922
}

Semantic roles & 50–950 ramp

primary

#3661BB

secondary

#C9B284

accent

#AE49DF

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3661BB

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

Preview Lab → · Contrast checker → · Palette generator →