#3666AD#3666AD

#3666AD is a mid, vivid blue. Relative luminance 0.133; OKLCH L 51.3% C 0.125 H 258.1°. Best body text is #FFFFFF at 5.74:1 contrast (WCAG AA passes).

Color values

HEX	#3666AD
RGB	rgb(54, 102, 173)
HSL	hsl(216, 52%, 45%)
HSV	hsv(216, 69%, 68%)
CMYK	cmyk(68.8%, 41%, 0%, 32.2%)
CIE-LAB	lab(43.22, 7.64, -42.76)
CIE-LCH	lch(43.22, 43.43, 280.13°)
OKLab	oklab(51.26% -0.0256 -0.1219)
OKLCH	oklch(51.26% 0.125 258.1)
XYZ	xyz(13.8128, 13.3027, 41.3668)
Luminance	0.1330 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666AD #AD7D36

analogous

#36A2AD #3666AD #4136AD

triadic

#3666AD #AD3666 #66AD36

tetradic

#3666AD #AD36A2 #AD7D36 #36AD41

square

#3666AD #AD36A2 #AD7D36 #36AD41

split-complementary

#3666AD #AD4136 #A2AD36

monochromatic

#192F50 #274B7E #3666AD #5685CA #85A7D9

Accessibility & contrast

On white

5.74

#3666AD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.66

#3666AD on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666AD

5.74:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666AD	#FFFFFF	#000000	##FFFFFF
##3666AD	1.00	5.74	3.66	5.74
#FFFFFF	5.74	1.00	21.00	1.00
#000000	3.66	21.00	1.00	21.00
##FFFFFF	5.74	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#456CB0

Deuteranopia (green-blind)

#3361AC

Tritanopia (blue-blind)

#007681

Achromatopsia (no color)

#666666

Design tokens & code

CSS

--color: #3666ad;
/* rgb */ color: rgb(54, 102, 173);
/* oklch */ color: oklch(51.3% 0.125 258.1);

Tailwind

colors: {
  custom: {
    50: '#7a91c6',
    500: '#3666ad',
    950: '#000000',
  },
}

SCSS

$custom: #3666ad;
$custom-light: #7a91c6;
$custom-dark: #000000;

JSON

{
  "hex": "#3666ad",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 173
  },
  "hsl": {
    "h": 215.798,
    "s": 52.423,
    "l": 44.51
  },
  "oklch": {
    "l": 0.51262,
    "c": 0.12456,
    "h": 258.1
  },
  "luminance": 0.13304
}

Semantic roles & 50–950 ramp

primary

#3666AD

secondary

#C2A67C

accent

#A24CDC

background

#F7F8FC

surface

#EEF0F8

border

#C9CBD1

text

#0A0C13

muted

#7C7D82

Preview Lab

Preview with #3666AD

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

Preview Lab → · Contrast checker → · Palette generator →