#3155B3#3155B3

#3155B3 is a mid, vivid blue. Relative luminance 0.104; OKLCH L 47.8% C 0.155 H 265.2°. Best body text is #FFFFFF at 6.82:1 contrast (WCAG AA passes).

Color values

HEX	#3155B3
RGB	rgb(49, 85, 179)
HSL	hsl(223, 57%, 45%)
HSV	hsv(223, 73%, 70%)
CMYK	cmyk(72.6%, 52.5%, 0%, 29.8%)
CIE-LAB	lab(38.56, 20.12, -53.78)
CIE-LCH	lch(38.56, 57.42, 290.51°)
OKLab	oklab(47.75% -0.0131 -0.1547)
OKLCH	oklch(47.75% 0.155 265.2)
XYZ	xyz(12.6489, 10.4033, 43.9805)
Luminance	0.1041 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3155B3 #B38F31

analogous

#3196B3 #3155B3 #4E31B3

triadic

#3155B3 #B33155 #55B331

tetradic

#3155B3 #B33196 #B38F31 #31B34E

square

#3155B3 #B33196 #B38F31 #31B34E

split-complementary

#3155B3 #B34E31 #96B331

monochromatic

#172753 #243E83 #3155B3 #5275D0 #829BDD

Accessibility & contrast

On white

6.82

#3155B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.08

#3155B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3155B3

6.82:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3155B3	#FFFFFF	#000000	##FFFFFF
##3155B3	1.00	6.82	3.08	6.82
#FFFFFF	6.82	1.00	21.00	1.00
#000000	3.08	21.00	1.00	21.00
##FFFFFF	6.82	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#1661B6

Deuteranopia (green-blind)

#0055B1

Tritanopia (blue-blind)

#006C7C

Achromatopsia (no color)

#5B5B5B

Design tokens & code

CSS

--color: #3155b3;
/* rgb */ color: rgb(49, 85, 179);
/* oklch */ color: oklch(47.8% 0.155 265.2);

Tailwind

colors: {
  custom: {
    50: '#7a84ca',
    500: '#3155b3',
    950: '#000000',
  },
}

SCSS

$custom: #3155b3;
$custom-light: #7a84ca;
$custom-dark: #000000;

JSON

{
  "hex": "#3155b3",
  "rgb": {
    "r": 49,
    "g": 85,
    "b": 179
  },
  "hsl": {
    "h": 223.385,
    "s": 57.018,
    "l": 44.706
  },
  "oklch": {
    "l": 0.4775,
    "c": 0.15524,
    "h": 265.2
  },
  "luminance": 0.10405
}

Semantic roles & 50–950 ramp

primary

#3155B3

secondary

#C6B17A

accent

#B648E0

background

#F8F8FC

surface

#EFEFF8

border

#CACAD1

text

#0B0A13

muted

#7C7C82

Preview Lab

Preview with #3155B3

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

Preview Lab → · Contrast checker → · Palette generator →