#3666B2#3666B2

#3666B2 is a mid, vivid blue. Relative luminance 0.135; OKLCH L 51.6% C 0.131 H 259.3°. Best body text is #FFFFFF at 5.68:1 contrast (WCAG AA passes).

Color values

HEX	#3666B2
RGB	rgb(54, 102, 178)
HSL	hsl(217, 53%, 45%)
HSV	hsv(217, 70%, 70%)
CMYK	cmyk(69.7%, 42.7%, 0%, 30.2%)
CIE-LAB	lab(43.51, 9.47, -45.22)
CIE-LCH	lch(43.51, 46.20, 281.83°)
OKLab	oklab(51.58% -0.0245 -0.1292)
OKLCH	oklch(51.58% 0.131 259.3)
XYZ	xyz(14.3057, 13.4999, 43.9627)
Luminance	0.1350 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666B2 #B28236

analogous

#36A4B2 #3666B2 #4436B2

triadic

#3666B2 #B23666 #66B236

tetradic

#3666B2 #B236A4 #B28236 #36B244

square

#3666B2 #B236A4 #B28236 #36B244

split-complementary

#3666B2 #B24436 #A4B236

monochromatic

#1A3054 #284B83 #3666B2 #5986CD #88A8DB

Accessibility & contrast

On white

5.68

#3666B2 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.70

#3666B2 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666B2

5.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666B2	#FFFFFF	#000000	##FFFFFF
##3666B2	1.00	5.68	3.70	5.68
#FFFFFF	5.68	1.00	21.00	1.00
#000000	3.70	21.00	1.00	21.00
##FFFFFF	5.68	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#426DB5

Deuteranopia (green-blind)

#2D61B0

Tritanopia (blue-blind)

#007883

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #3666b2;
/* rgb */ color: rgb(54, 102, 178);
/* oklch */ color: oklch(51.6% 0.131 259.3);

Tailwind

colors: {
  custom: {
    50: '#7b91c9',
    500: '#3666b2',
    950: '#000000',
  },
}

SCSS

$custom: #3666b2;
$custom-light: #7b91c9;
$custom-dark: #000000;

JSON

{
  "hex": "#3666b2",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 178
  },
  "hsl": {
    "h": 216.774,
    "s": 53.448,
    "l": 45.49
  },
  "oklch": {
    "l": 0.51582,
    "c": 0.13147,
    "h": 259.3
  },
  "luminance": 0.13501
}

Semantic roles & 50–950 ramp

primary

#3666B2

secondary

#C5AA7F

accent

#A44BDD

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0B0C13

muted

#7C7D82

Preview Lab

Preview with #3666B2

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

Preview Lab → · Contrast checker → · Palette generator →