#3770D9#3770D9

#3770D9 is a mid, vivid blue. Relative luminance 0.174; OKLCH L 56.4% C 0.172 H 261.3°. Best body text is #FFFFFF at 4.69:1 contrast (WCAG AA passes).

Color values

HEX	#3770D9
RGB	rgb(55, 112, 217)
HSL	hsl(219, 68%, 53%)
HSV	hsv(219, 75%, 85%)
CMYK	cmyk(74.7%, 48.4%, 0%, 14.9%)
CIE-LAB	lab(48.77, 17.67, -59.23)
CIE-LCH	lch(48.77, 61.81, 286.61°)
OKLab	oklab(56.42% -0.0259 -0.1702)
OKLCH	oklch(56.42% 0.172 261.3)
XYZ	xyz(19.8896, 17.4081, 67.9440)
Luminance	0.1741 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3770D9 #D9A037

analogous

#37C1D9 #3770D9 #4F37D9

triadic

#3770D9 #D93770 #70D937

tetradic

#3770D9 #D937C1 #D9A037 #37D94F

square

#3770D9 #D937C1 #D9A037 #37D94F

split-complementary

#3770D9 #D94F37 #C1D937

monochromatic

#183C7E #2254B1 #3770D9 #6A95E3 #9EBAED

Accessibility & contrast

On white

4.69

#3770D9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.48

#3770D9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3770D9

4.69:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3770D9	#FFFFFF	#000000	##FFFFFF
##3770D9	1.00	4.69	4.48	4.69
#FFFFFF	4.69	1.00	21.00	1.00
#000000	4.48	21.00	1.00	21.00
##FFFFFF	4.69	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#347CDD

Deuteranopia (green-blind)

#006DD7

Tritanopia (blue-blind)

#00899A

Achromatopsia (no color)

#747474

Design tokens & code

CSS

--color: #3770d9;
/* rgb */ color: rgb(55, 112, 217);
/* oklch */ color: oklch(56.4% 0.172 261.3);

Tailwind

colors: {
  custom: {
    50: '#8398e5',
    500: '#3770d9',
    950: '#000000',
  },
}

SCSS

$custom: #3770d9;
$custom-light: #8398e5;
$custom-dark: #000000;

JSON

{
  "hex": "#3770d9",
  "rgb": {
    "r": 55,
    "g": 112,
    "b": 217
  },
  "hsl": {
    "h": 218.889,
    "s": 68.067,
    "l": 53.333
  },
  "oklch": {
    "l": 0.5642,
    "c": 0.17214,
    "h": 261.3
  },
  "luminance": 0.1741
}

Semantic roles & 50–950 ramp

primary

#3770D9

secondary

#D9C093

accent

#AE3DEB

background

#F8F9FE

surface

#F0F2FC

border

#CBCCD5

text

#0C0D16

muted

#7D7E84

Preview Lab

Preview with #3770D9

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

Preview Lab → · Contrast checker → · Palette generator →