#3771CB#3771CB

#3771CB is a mid, vivid blue. Relative luminance 0.169; OKLCH L 55.7% C 0.152 H 259.0°. Best body text is #FFFFFF at 4.79:1 contrast (WCAG AA passes).

Color values

HEX	#3771CB
RGB	rgb(55, 113, 203)
HSL	hsl(216, 59%, 51%)
HSV	hsv(216, 73%, 80%)
CMYK	cmyk(72.9%, 44.3%, 0%, 20.4%)
CIE-LAB	lab(48.17, 11.87, -52.22)
CIE-LCH	lch(48.17, 53.55, 282.81°)
OKLab	oklab(55.68% -0.029 -0.1495)
OKLCH	oklch(55.68% 0.152 259)
XYZ	xyz(18.2563, 16.9323, 58.7944)
Luminance	0.1693 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3771CB #CB9137

analogous

#37BBCB #3771CB #4737CB

triadic

#3771CB #CB3771 #71CB37

tetradic

#3771CB #CB37BB #CB9137 #37CB47

square

#3771CB #CB37BB #CB9137 #37CB47

split-complementary

#3771CB #CB4737 #BBCB37

monochromatic

#1C3B6C #29569C #3771CB #6893D8 #98B6E4

Accessibility & contrast

On white

4.79

#3771CB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.39

#3771CB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3771CB

4.79:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3771CB	#FFFFFF	#000000	##FFFFFF
##3771CB	1.00	4.79	4.39	4.79
#FFFFFF	4.79	1.00	21.00	1.00
#000000	4.39	21.00	1.00	21.00
##FFFFFF	4.79	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#447ACE

Deuteranopia (green-blind)

#276CC9

Tritanopia (blue-blind)

#008694

Achromatopsia (no color)

#727272

Design tokens & code

CSS

--color: #3771cb;
/* rgb */ color: rgb(55, 113, 203);
/* oklch */ color: oklch(55.7% 0.152 259.0);

Tailwind

colors: {
  custom: {
    50: '#8099db',
    500: '#3771cb',
    950: '#000000',
  },
}

SCSS

$custom: #3771cb;
$custom-light: #8099db;
$custom-dark: #000000;

JSON

{
  "hex": "#3771cb",
  "rgb": {
    "r": 55,
    "g": 113,
    "b": 203
  },
  "hsl": {
    "h": 216.486,
    "s": 58.73,
    "l": 50.588
  },
  "oklch": {
    "l": 0.55682,
    "c": 0.15231,
    "h": 259
  },
  "luminance": 0.16934
}

Semantic roles & 50–950 ramp

primary

#3771CB

secondary

#D0B68E

accent

#A546E2

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3771CB

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

Preview Lab → · Contrast checker → · Palette generator →