#3666AF#3666AF

#3666AF is a mid, vivid blue. Relative luminance 0.134; OKLCH L 51.4% C 0.127 H 258.6°. Best body text is #FFFFFF at 5.71:1 contrast (WCAG AA passes).

Color values

HEX	#3666AF
RGB	rgb(54, 102, 175)
HSL	hsl(216, 53%, 45%)
HSV	hsv(216, 69%, 69%)
CMYK	cmyk(69.1%, 41.7%, 0%, 31.4%)
CIE-LAB	lab(43.33, 8.37, -43.75)
CIE-LCH	lch(43.33, 44.54, 280.83°)
OKLab	oklab(51.39% -0.0251 -0.1248)
OKLCH	oklch(51.39% 0.127 258.6)
XYZ	xyz(14.0078, 13.3807, 42.3936)
Luminance	0.1338 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3666AF #AF7F36

analogous

#36A3AF #3666AF #4236AF

triadic

#3666AF #AF3666 #66AF36

tetradic

#3666AF #AF36A3 #AF7F36 #36AF42

square

#3666AF #AF36A3 #AF7F36 #36AF42

split-complementary

#3666AF #AF4236 #A3AF36

monochromatic

#192F51 #284B80 #3666AF #5785CB #86A7DA

Accessibility & contrast

On white

5.71

#3666AF on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.68

#3666AF on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3666AF

5.71:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3666AF	#FFFFFF	#000000	##FFFFFF
##3666AF	1.00	5.71	3.68	5.71
#FFFFFF	5.71	1.00	21.00	1.00
#000000	3.68	21.00	1.00	21.00
##FFFFFF	5.71	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#446CB2

Deuteranopia (green-blind)

#3161AE

Tritanopia (blue-blind)

#007782

Achromatopsia (no color)

#666666

Design tokens & code

CSS

--color: #3666af;
/* rgb */ color: rgb(54, 102, 175);
/* oklch */ color: oklch(51.4% 0.127 258.6);

Tailwind

colors: {
  custom: {
    50: '#7b91c7',
    500: '#3666af',
    950: '#000000',
  },
}

SCSS

$custom: #3666af;
$custom-light: #7b91c7;
$custom-dark: #000000;

JSON

{
  "hex": "#3666af",
  "rgb": {
    "r": 54,
    "g": 102,
    "b": 175
  },
  "hsl": {
    "h": 216.198,
    "s": 52.838,
    "l": 44.902
  },
  "oklch": {
    "l": 0.51389,
    "c": 0.12733,
    "h": 258.6
  },
  "luminance": 0.13382
}

Semantic roles & 50–950 ramp

primary

#3666AF

secondary

#C3A87D

accent

#A34CDC

background

#F8F8FC

surface

#EFF0F8

border

#CACBD1

text

#0A0C13

muted

#7C7D82

Preview Lab

Preview with #3666AF

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

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