#3771D9#3771D9

#3771D9 is a mid, vivid blue. Relative luminance 0.176; OKLCH L 56.6% C 0.171 H 261.0°. Best body text is #FFFFFF at 4.64:1 contrast (WCAG AA passes).

Color values

HEX	#3771D9
RGB	rgb(55, 113, 217)
HSL	hsl(219, 68%, 53%)
HSV	hsv(219, 75%, 85%)
CMYK	cmyk(74.7%, 47.9%, 0%, 14.9%)
CIE-LAB	lab(49.04, 17.03, -58.79)
CIE-LCH	lch(49.04, 61.21, 286.16°)
OKLab	oklab(56.63% -0.0267 -0.1689)
OKLCH	oklch(56.63% 0.171 261)
XYZ	xyz(20.0005, 17.6300, 67.9810)
Luminance	0.1763 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3771D9 #D99F37

analogous

#37C2D9 #3771D9 #4E37D9

triadic

#3771D9 #D93771 #71D937

tetradic

#3771D9 #D937C2 #D99F37 #37D94E

square

#3771D9 #D937C2 #D99F37 #37D94E

split-complementary

#3771D9 #D94E37 #C2D937

monochromatic

#183C7E #2255B1 #3771D9 #6A96E3 #9EBAED

Accessibility & contrast

On white

4.64

#3771D9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.53

#3771D9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#FFFFFF on #3771D9

4.64:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3771D9	#FFFFFF	#000000	##FFFFFF
##3771D9	1.00	4.64	4.53	4.64
#FFFFFF	4.64	1.00	21.00	1.00
#000000	4.53	21.00	1.00	21.00
##FFFFFF	4.64	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#367CDD

Deuteranopia (green-blind)

#006ED7

Tritanopia (blue-blind)

#008A9A

Achromatopsia (no color)

#757575

Design tokens & code

CSS

--color: #3771d9;
/* rgb */ color: rgb(55, 113, 217);
/* oklch */ color: oklch(56.6% 0.171 261.0);

Tailwind

colors: {
  custom: {
    50: '#8399e5',
    500: '#3771d9',
    950: '#000000',
  },
}

SCSS

$custom: #3771d9;
$custom-light: #8399e5;
$custom-dark: #000000;

JSON

{
  "hex": "#3771d9",
  "rgb": {
    "r": 55,
    "g": 113,
    "b": 217
  },
  "hsl": {
    "h": 218.519,
    "s": 68.067,
    "l": 53.333
  },
  "oklch": {
    "l": 0.5663,
    "c": 0.17097,
    "h": 261
  },
  "luminance": 0.17632
}

Semantic roles & 50–950 ramp

primary

#3771D9

secondary

#D9C093

accent

#AD3DEB

background

#F8F9FE

surface

#F0F2FC

border

#CBCCD5

text

#0C0D16

muted

#7D7E84

Preview Lab

Preview with #3771D9

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

Preview Lab → · Contrast checker → · Palette generator →