#3166B5#3166B5

#3166B5 is a mid, vivid blue. Relative luminance 0.135; OKLCH L 51.6% C 0.137 H 258.4°. Best body text is #FFFFFF at 5.68:1 contrast (WCAG AA passes).

Color values

HEX	#3166B5
RGB	rgb(49, 102, 181)
HSL	hsl(216, 57%, 45%)
HSV	hsv(216, 73%, 71%)
CMYK	cmyk(72.9%, 43.6%, 0%, 29%)
CIE-LAB	lab(43.49, 9.84, -47.01)
CIE-LCH	lch(43.49, 48.03, 281.82°)
OKLab	oklab(51.58% -0.0276 -0.1345)
OKLCH	oklch(51.58% 0.137 258.4)
XYZ	xyz(14.3555, 13.4903, 45.5544)
Luminance	0.1349 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3166B5 #B58031

analogous

#31A8B5 #3166B5 #3E31B5

triadic

#3166B5 #B53166 #66B531

tetradic

#3166B5 #B531A8 #B58031 #31B53E

square

#3166B5 #B531A8 #B58031 #31B53E

split-complementary

#3166B5 #B53E31 #A8B531

monochromatic

#173055 #244B85 #3166B5 #5385D0 #83A7DD

Accessibility & contrast

On white

5.68

#3166B5 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.70

#3166B5 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3166B5

5.68:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3166B5	#FFFFFF	#000000	##FFFFFF
##3166B5	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)

#3F6DB8

Deuteranopia (green-blind)

#2761B3

Tritanopia (blue-blind)

#007884

Achromatopsia (no color)

#676767

Design tokens & code

CSS

--color: #3166b5;
/* rgb */ color: rgb(49, 102, 181);
/* oklch */ color: oklch(51.6% 0.137 258.4);

Tailwind

colors: {
  custom: {
    50: '#7a91cc',
    500: '#3166b5',
    950: '#000000',
  },
}

SCSS

$custom: #3166b5;
$custom-light: #7a91cc;
$custom-dark: #000000;

JSON

{
  "hex": "#3166b5",
  "rgb": {
    "r": 49,
    "g": 102,
    "b": 181
  },
  "hsl": {
    "h": 215.909,
    "s": 57.391,
    "l": 45.098
  },
  "oklch": {
    "l": 0.51575,
    "c": 0.13729,
    "h": 258.4
  },
  "luminance": 0.13492
}

Semantic roles & 50–950 ramp

primary

#3166B5

secondary

#C7A87B

accent

#A347E1

background

#F8F8FC

surface

#EFF0F9

border

#CACBD2

text

#0A0C13

muted

#7C7D82

Preview Lab

Preview with #3166B5

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

Preview Lab → · Contrast checker → · Palette generator →