#3557BB#3557BB

#3557BB is a mid, vivid blue. Relative luminance 0.112; OKLCH L 49.0% C 0.163 H 266.3°. Best body text is #FFFFFF at 6.50:1 contrast (WCAG AA passes).

Color values

HEX	#3557BB
RGB	rgb(53, 87, 187)
HSL	hsl(225, 56%, 47%)
HSV	hsv(225, 72%, 73%)
CMYK	cmyk(71.7%, 53.5%, 0%, 26.7%)
CIE-LAB	lab(39.85, 22.34, -56.38)
CIE-LCH	lch(39.85, 60.64, 291.62°)
OKLab	oklab(48.96% -0.0106 -0.1622)
OKLCH	oklch(48.96% 0.163 266.3)
XYZ	xyz(13.8429, 11.1597, 48.4286)
Luminance	0.1116 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3557BB #BB9935

analogous

#359ABB #3557BB #5635BB

triadic

#3557BB #BB3557 #57BB35

tetradic

#3557BB #BB359A #BB9935 #35BB56

square

#3557BB #BB359A #BB9935 #35BB56

split-complementary

#3557BB #BB5635 #9ABB35

monochromatic

#1A2B5C #27418B #3557BB #5C7AD1 #8CA1DE

Accessibility & contrast

On white

6.50

#3557BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.23

#3557BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3557BB

6.50:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3557BB	#FFFFFF	#000000	##FFFFFF
##3557BB	1.00	6.50	3.23	6.50
#FFFFFF	6.50	1.00	21.00	1.00
#000000	3.23	21.00	1.00	21.00
##FFFFFF	6.50	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0D64BF

Deuteranopia (green-blind)

#0058B9

Tritanopia (blue-blind)

#006F80

Achromatopsia (no color)

#5E5E5E

Design tokens & code

CSS

--color: #3557bb;
/* rgb */ color: rgb(53, 87, 187);
/* oklch */ color: oklch(49.0% 0.163 266.3);

Tailwind

colors: {
  custom: {
    50: '#7d85d0',
    500: '#3557bb',
    950: '#000000',
  },
}

SCSS

$custom: #3557bb;
$custom-light: #7d85d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3557bb",
  "rgb": {
    "r": 53,
    "g": 87,
    "b": 187
  },
  "hsl": {
    "h": 224.776,
    "s": 55.833,
    "l": 47.059
  },
  "oklch": {
    "l": 0.48958,
    "c": 0.16257,
    "h": 266.3
  },
  "luminance": 0.11161
}

Semantic roles & 50–950 ramp

primary

#3557BB

secondary

#C9B783

accent

#B949DF

background

#F8F8FC

surface

#EFEFF9

border

#CACAD2

text

#0B0B14

muted

#7C7C82

Preview Lab

Preview with #3557BB

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

Preview Lab → · Contrast checker → · Palette generator →