#3366B9#3366B9

#3366B9 is a mid, vivid blue. Relative luminance 0.137; OKLCH L 51.9% C 0.142 H 259.7°. Best body text is #FFFFFF at 5.61:1 contrast (WCAG AA passes).

Color values

HEX	#3366B9
RGB	rgb(51, 102, 185)
HSL	hsl(217, 57%, 46%)
HSV	hsv(217, 72%, 73%)
CMYK	cmyk(72.4%, 44.9%, 0%, 27.5%)
CIE-LAB	lab(43.81, 11.62, -48.83)
CIE-LCH	lch(43.81, 50.19, 283.38°)
OKLab	oklab(51.92% -0.0254 -0.1398)
OKLCH	oklch(51.92% 0.142 259.7)
XYZ	xyz(14.8704, 13.7077, 47.7517)
Luminance	0.1371 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3366B9 #B98633

analogous

#33A9B9 #3366B9 #4333B9

triadic

#3366B9 #B93366 #66B933

tetradic

#3366B9 #B933A9 #B98633 #33B943

square

#3366B9 #B933A9 #B98633 #33B943

split-complementary

#3366B9 #B94333 #A9B933

monochromatic

#193159 #264C89 #3366B9 #5886D1 #88A9DE

Accessibility & contrast

On white

5.61

#3366B9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.74

#3366B9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3366B9

5.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3366B9	#FFFFFF	#000000	##FFFFFF
##3366B9	1.00	5.61	3.74	5.61
#FFFFFF	5.61	1.00	21.00	1.00
#000000	3.74	21.00	1.00	21.00
##FFFFFF	5.61	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#3C6EBC

Deuteranopia (green-blind)

#2262B7

Tritanopia (blue-blind)

#007986

Achromatopsia (no color)

#686868

Design tokens & code

CSS

--color: #3366b9;
/* rgb */ color: rgb(51, 102, 185);
/* oklch */ color: oklch(51.9% 0.142 259.7);

Tailwind

colors: {
  custom: {
    50: '#7c91ce',
    500: '#3366b9',
    950: '#000000',
  },
}

SCSS

$custom: #3366b9;
$custom-light: #7c91ce;
$custom-dark: #000000;

JSON

{
  "hex": "#3366b9",
  "rgb": {
    "r": 51,
    "g": 102,
    "b": 185
  },
  "hsl": {
    "h": 217.164,
    "s": 56.78,
    "l": 46.275
  },
  "oklch": {
    "l": 0.5192,
    "c": 0.1421,
    "h": 259.7
  },
  "luminance": 0.13709
}

Semantic roles & 50–950 ramp

primary

#3366B9

secondary

#C8AD80

accent

#A648E0

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0B0C14

muted

#7C7D82

Preview Lab

Preview with #3366B9

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

Preview Lab → · Contrast checker → · Palette generator →