#3666BA#3666BA

#3666BA is a mid, vivid blue. Relative luminance 0.138; OKLCH L 52.1% C 0.142 H 260.7°. Best body text is #FFFFFF at 5.58:1 contrast (WCAG AA passes).

Color values

HEX	#3666BA
RGB	rgb(54, 102, 186)
HSL	hsl(218, 55%, 47%)
HSV	hsv(218, 71%, 73%)
CMYK	cmyk(71%, 45.2%, 0%, 27.1%)
CIE-LAB	lab(43.99, 12.42, -49.12)
CIE-LCH	lch(43.99, 50.67, 284.19°)
OKLab	oklab(52.11% -0.023 -0.1406)
OKLCH	oklch(52.11% 0.142 260.7)
XYZ	xyz(15.1324, 13.8306, 48.3169)
Luminance	0.1383 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666BA #BA8A36

analogous

#36A8BA #3666BA #4836BA

triadic

#3666BA #BA3666 #66BA36

tetradic

#3666BA #BA36A8 #BA8A36 #36BA48

square

#3666BA #BA36A8 #BA8A36 #36BA48

split-complementary

#3666BA #BA4836 #A8BA36

monochromatic

#1A325B #284C8B #3666BA #5D87D0 #8DAADE

Accessibility & contrast

On white

5.58

#3666BA on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.77

#3666BA on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666BA

5.58:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666BA	#FFFFFF	#000000	##FFFFFF
##3666BA	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)

#3C6EBD

Deuteranopia (green-blind)

#2262B8

Tritanopia (blue-blind)

#007A87

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3666ba;
/* rgb */ color: rgb(54, 102, 186);
/* oklch */ color: oklch(52.1% 0.142 260.7);

Tailwind

colors: {
  custom: {
    50: '#7d91cf',
    500: '#3666ba',
    950: '#000000',
  },
}

SCSS

$custom: #3666ba;
$custom-light: #7d91cf;
$custom-dark: #000000;

JSON

{
  "hex": "#3666ba",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 186
  },
  "hsl": {
    "h": 218.182,
    "s": 55,
    "l": 47.059
  },
  "oklch": {
    "l": 0.5211,
    "c": 0.14248,
    "h": 260.7
  },
  "luminance": 0.13832
}

Semantic roles & 50–950 ramp

primary

#3666BA

secondary

#C8AF84

accent

#A849DE

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3666BA

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

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