#3773DD#3773DD

#3773DD is a mid, vivid blue. Relative luminance 0.183; OKLCH L 57.3% C 0.174 H 260.8°. Best body text is #000000 at 4.66:1 contrast (WCAG AA passes).

Color values

HEX	#3773DD
RGB	rgb(55, 115, 221)
HSL	hsl(218, 71%, 54%)
HSV	hsv(218, 75%, 87%)
CMYK	cmyk(75.1%, 48%, 0%, 13.3%)
CIE-LAB	lab(49.85, 17.25, -59.76)
CIE-LCH	lch(49.85, 62.20, 286.10°)
OKLab	oklab(57.33% -0.0278 -0.1717)
OKLCH	oklch(57.33% 0.174 260.8)
XYZ	xyz(20.7527, 18.2918, 70.8295)
Luminance	0.1829 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3773DD #DDA137

analogous

#37C6DD #3773DD #4E37DD

triadic

#3773DD #DD3773 #73DD37

tetradic

#3773DD #DD37C6 #DDA137 #37DD4E

square

#3773DD #DD37C6 #DDA137 #37DD4E

split-complementary

#3773DD #DD4E37 #C6DD37

monochromatic

#163E83 #1F56B8 #3773DD #6B98E6 #A0BCEF

Accessibility & contrast

On white

4.51

#3773DD on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.66

#3773DD on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #3773DD

4.66:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3773DD	#FFFFFF	#000000	##000000
##3773DD	1.00	4.51	4.66	4.66
#FFFFFF	4.51	1.00	21.00	21.00
#000000	4.66	21.00	1.00	1.00
##000000	4.66	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#377FE1

Deuteranopia (green-blind)

#006FDB

Tritanopia (blue-blind)

#008C9D

Achromatopsia (no color)

#777777

Design tokens & code

CSS

--color: #3773dd;
/* rgb */ color: rgb(55, 115, 221);
/* oklch */ color: oklch(57.3% 0.174 260.8);

Tailwind

colors: {
  custom: {
    50: '#849ae8',
    500: '#3773dd',
    950: '#000000',
  },
}

SCSS

$custom: #3773dd;
$custom-light: #849ae8;
$custom-dark: #000000;

JSON

{
  "hex": "#3773dd",
  "rgb": {
    "r": 55,
    "g": 115,
    "b": 221
  },
  "hsl": {
    "h": 218.313,
    "s": 70.94,
    "l": 54.118
  },
  "oklch": {
    "l": 0.57329,
    "c": 0.1739,
    "h": 260.8
  },
  "luminance": 0.18294
}

Semantic roles & 50–950 ramp

primary

#3773DD

secondary

#DBC295

accent

#AD3AEE

background

#F8F9FE

surface

#F0F2FD

border

#CBCCD5

text

#0C0E16

muted

#7D7E84

Preview Lab

Preview with #3773DD

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

Preview Lab → · Contrast checker → · Palette generator →