#3771CC#3771CC

#3771CC is a mid, vivid blue. Relative luminance 0.170; OKLCH L 55.7% C 0.154 H 259.2°. Best body text is #FFFFFF at 4.78:1 contrast (WCAG AA passes).

Color values

HEX	#3771CC
RGB	rgb(55, 113, 204)
HSL	hsl(217, 59%, 51%)
HSV	hsv(217, 73%, 80%)
CMYK	cmyk(73%, 44.6%, 0%, 20%)
CIE-LAB	lab(48.23, 12.24, -52.69)
CIE-LCH	lch(48.23, 54.10, 283.08°)
OKLab	oklab(55.75% -0.0289 -0.1509)
OKLCH	oklch(55.75% 0.154 259.2)
XYZ	xyz(18.3758, 16.9801, 59.4241)
Luminance	0.1698 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3771CC #CC9237

analogous

#37BCCC #3771CC #4737CC

triadic

#3771CC #CC3771 #71CC37

tetradic

#3771CC #CC37BC #CC9237 #37CC47

square

#3771CC #CC37BC #CC9237 #37CC47

split-complementary

#3771CC #CC4737 #BCCC37

monochromatic

#1C3B6D #28569E #3771CC #6894D8 #99B6E5

Accessibility & contrast

On white

4.78

#3771CC on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.40

#3771CC on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3771CC

4.78:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3771CC	#FFFFFF	#000000	##FFFFFF
##3771CC	1.00	4.78	4.40	4.78
#FFFFFF	4.78	1.00	21.00	1.00
#000000	4.40	21.00	1.00	21.00
##FFFFFF	4.78	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#437ACF

Deuteranopia (green-blind)

#256CCA

Tritanopia (blue-blind)

#008694

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3771cc;
/* rgb */ color: rgb(55, 113, 204);
/* oklch */ color: oklch(55.7% 0.154 259.2);

Tailwind

colors: {
  custom: {
    50: '#8199dc',
    500: '#3771cc',
    950: '#000000',
  },
}

SCSS

$custom: #3771cc;
$custom-light: #8199dc;
$custom-dark: #000000;

JSON

{
  "hex": "#3771cc",
  "rgb": {
    "r": 55,
    "g": 113,
    "b": 204
  },
  "hsl": {
    "h": 216.644,
    "s": 59.363,
    "l": 50.784
  },
  "oklch": {
    "l": 0.55748,
    "c": 0.15364,
    "h": 259.2
  },
  "luminance": 0.16982
}

Semantic roles & 50–950 ramp

primary

#3771CC

secondary

#D0B78E

accent

#A545E3

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3771CC

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

Preview Lab → · Contrast checker → · Palette generator →