#3770CC#3770CC

#3770CC is a mid, vivid blue. Relative luminance 0.168; OKLCH L 55.5% C 0.155 H 259.6°. Best body text is #FFFFFF at 4.83:1 contrast (WCAG AA passes).

Color values

HEX	#3770CC
RGB	rgb(55, 112, 204)
HSL	hsl(217, 59%, 51%)
HSV	hsv(217, 73%, 80%)
CMYK	cmyk(73%, 45.1%, 0%, 20%)
CIE-LAB	lab(47.95, 12.87, -53.14)
CIE-LCH	lch(47.95, 54.68, 283.61°)
OKLab	oklab(55.53% -0.028 -0.1522)
OKLCH	oklch(55.53% 0.155 259.6)
XYZ	xyz(18.2649, 16.7582, 59.3871)
Luminance	0.1676 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3770CC #CC9337

analogous

#37BACC #3770CC #4837CC

triadic

#3770CC #CC3770 #70CC37

tetradic

#3770CC #CC37BA #CC9337 #37CC48

square

#3770CC #CC37BA #CC9337 #37CC48

split-complementary

#3770CC #CC4837 #BACC37

monochromatic

#1C3B6D #28559E #3770CC #6893D8 #99B6E5

Accessibility & contrast

On white

4.83

#3770CC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.35

#3770CC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3770CC

4.83:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3770CC	#FFFFFF	#000000	##FFFFFF
##3770CC	1.00	4.83	4.35	4.83
#FFFFFF	4.83	1.00	21.00	1.00
#000000	4.35	21.00	1.00	21.00
##FFFFFF	4.83	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4179CF

Deuteranopia (green-blind)

#226BCA

Tritanopia (blue-blind)

#008694

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3770cc;
/* rgb */ color: rgb(55, 112, 204);
/* oklch */ color: oklch(55.5% 0.155 259.6);

Tailwind

colors: {
  custom: {
    50: '#8198dc',
    500: '#3770cc',
    950: '#000000',
  },
}

SCSS

$custom: #3770cc;
$custom-light: #8198dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3770cc",
  "rgb": {
    "r": 55,
    "g": 112,
    "b": 204
  },
  "hsl": {
    "h": 217.047,
    "s": 59.363,
    "l": 50.784
  },
  "oklch": {
    "l": 0.55531,
    "c": 0.1548,
    "h": 259.6
  },
  "luminance": 0.1676
}

Semantic roles & 50–950 ramp

primary

#3770CC

secondary

#D0B78E

accent

#A645E3

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3770CC

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

Preview Lab → · Contrast checker → · Palette generator →