#3665B8#3665B8

#3665B8 is a mid, vivid blue. Relative luminance 0.136; OKLCH L 51.8% C 0.141 H 260.8°. Best body text is #FFFFFF at 5.66:1 contrast (WCAG AA passes).

Color values

HEX	#3665B8
RGB	rgb(54, 101, 184)
HSL	hsl(218, 55%, 47%)
HSV	hsv(218, 71%, 72%)
CMYK	cmyk(70.7%, 45.1%, 0%, 27.8%)
CIE-LAB	lab(43.58, 12.32, -48.61)
CIE-LCH	lch(43.58, 50.15, 284.22°)
OKLab	oklab(51.76% -0.0224 -0.1391)
OKLCH	oklch(51.76% 0.141 260.8)
XYZ	xyz(14.8236, 13.5508, 47.1724)
Luminance	0.1355 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3665B8 #B88936

analogous

#36A6B8 #3665B8 #4836B8

triadic

#3665B8 #B83665 #65B836

tetradic

#3665B8 #B836A6 #B88936 #36B848

square

#3665B8 #B836A6 #B88936 #36B848

split-complementary

#3665B8 #B84836 #A6B836

monochromatic

#1A3159 #284B89 #3665B8 #5C86CF #8BA9DD

Accessibility & contrast

On white

5.66

#3665B8 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.71

#3665B8 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3665B8

5.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3665B8	#FFFFFF	#000000	##FFFFFF
##3665B8	1.00	5.66	3.71	5.66
#FFFFFF	5.66	1.00	21.00	1.00
#000000	3.71	21.00	1.00	21.00
##FFFFFF	5.66	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3B6DBB

Deuteranopia (green-blind)

#2261B6

Tritanopia (blue-blind)

#007885

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #3665b8;
/* rgb */ color: rgb(54, 101, 184);
/* oklch */ color: oklch(51.8% 0.141 260.8);

Tailwind

colors: {
  custom: {
    50: '#7d90ce',
    500: '#3665b8',
    950: '#000000',
  },
}

SCSS

$custom: #3665b8;
$custom-light: #7d90ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3665b8",
  "rgb": {
    "r": 54,
    "g": 101,
    "b": 184
  },
  "hsl": {
    "h": 218.308,
    "s": 54.622,
    "l": 46.667
  },
  "oklch": {
    "l": 0.51756,
    "c": 0.14092,
    "h": 260.8
  },
  "luminance": 0.13552
}

Semantic roles & 50–950 ramp

primary

#3665B8

secondary

#C7AE82

accent

#A84ADE

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3665B8

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

Preview Lab → · Contrast checker → · Palette generator →