#3551BB#3551BB

#3551BB is a mid, vivid blue. Relative luminance 0.102; OKLCH L 47.8% C 0.170 H 268.1°. Best body text is #FFFFFF at 6.89:1 contrast (WCAG AA passes).

Color values

HEX	#3551BB
RGB	rgb(53, 81, 187)
HSL	hsl(227, 56%, 47%)
HSV	hsv(227, 72%, 73%)
CMYK	cmyk(71.7%, 56.7%, 0%, 26.7%)
CIE-LAB	lab(38.25, 26.25, -58.97)
CIE-LCH	lch(38.25, 64.55, 294.00°)
OKLab	oklab(47.75% -0.0057 -0.1699)
OKLCH	oklch(47.75% 0.17 268.1)
XYZ	xyz(13.3772, 10.2282, 48.2733)
Luminance	0.1023 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3551BB #BB9F35

analogous

#3594BB #3551BB #5C35BB

triadic

#3551BB #BB3551 #51BB35

tetradic

#3551BB #BB3594 #BB9F35 #35BB5C

square

#3551BB #BB3594 #BB9F35 #35BB5C

split-complementary

#3551BB #BB5C35 #94BB35

monochromatic

#1A285C #273C8B #3551BB #5C75D1 #8C9DDE

Accessibility & contrast

On white

6.89

#3551BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

3.05

#3551BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3551BB

6.89:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3551BB	#FFFFFF	#000000	##FFFFFF
##3551BB	1.00	6.89	3.05	6.89
#FFFFFF	6.89	1.00	21.00	1.00
#000000	3.05	21.00	1.00	21.00
##FFFFFF	6.89	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#0060BF

Deuteranopia (green-blind)

#0054B9

Tritanopia (blue-blind)

#006B7E

Achromatopsia (no color)

#5A5A5A

Design tokens & code

CSS

--color: #3551bb;
/* rgb */ color: rgb(53, 81, 187);
/* oklch */ color: oklch(47.8% 0.170 268.1);

Tailwind

colors: {
  custom: {
    50: '#7e81d0',
    500: '#3551bb',
    950: '#000000',
  },
}

SCSS

$custom: #3551bb;
$custom-light: #7e81d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3551bb",
  "rgb": {
    "r": 53,
    "g": 81,
    "b": 187
  },
  "hsl": {
    "h": 227.463,
    "s": 55.833,
    "l": 47.059
  },
  "oklch": {
    "l": 0.47754,
    "c": 0.17005,
    "h": 268.1
  },
  "luminance": 0.1023
}

Semantic roles & 50–950 ramp

primary

#3551BB

secondary

#C9BA83

accent

#C049DF

background

#F8F7FC

surface

#EFEEF9

border

#CAC9D2

text

#0B0A14

muted

#7C7C82

Preview Lab

Preview with #3551BB

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

Preview Lab → · Contrast checker → · Palette generator →