#3770BB#3770BB

#3770BB is a mid, vivid cyan. Relative luminance 0.160; OKLCH L 54.4% C 0.132 H 256.2°. Best body text is #FFFFFF at 5.00:1 contrast (WCAG AA passes).

Color values

HEX	#3770BB
RGB	rgb(55, 112, 187)
HSL	hsl(214, 55%, 47%)
HSV	hsv(214, 71%, 73%)
CMYK	cmyk(70.6%, 40.1%, 0%, 26.7%)
CIE-LAB	lab(46.96, 6.63, -44.96)
CIE-LCH	lch(46.96, 45.44, 278.39°)
OKLab	oklab(54.44% -0.0314 -0.1282)
OKLCH	oklch(54.44% 0.132 256.2)
XYZ	xyz(16.3361, 15.9867, 49.2289)
Luminance	0.1599 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3770BB #BB8237

analogous

#37B2BB #3770BB #4037BB

triadic

#3770BB #BB3770 #70BB37

tetradic

#3770BB #BB37B2 #BB8237 #37BB40

square

#3770BB #BB37B2 #BB8237 #37BB40

split-complementary

#3770BB #BB4037 #B2BB37

monochromatic

#1B375C #29548C #3770BB #5F90D0 #8EB1DE

Accessibility & contrast

On white

5.00

#3770BB on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.20

#3770BB on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3770BB

5.00:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3770BB	#FFFFFF	#000000	##FFFFFF
##3770BB	1.00	5.00	4.20	5.00
#FFFFFF	5.00	1.00	21.00	1.00
#000000	4.20	21.00	1.00	21.00
##FFFFFF	5.00	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4D76BE

Deuteranopia (green-blind)

#386AB9

Tritanopia (blue-blind)

#00818C

Achromatopsia (no color)

#6F6F6F

Design tokens & code

CSS

--color: #3770bb;
/* rgb */ color: rgb(55, 112, 187);
/* oklch */ color: oklch(54.4% 0.132 256.2);

Tailwind

colors: {
  custom: {
    50: '#7d98d0',
    500: '#3770bb',
    950: '#000000',
  },
}

SCSS

$custom: #3770bb;
$custom-light: #7d98d0;
$custom-dark: #000000;

JSON

{
  "hex": "#3770bb",
  "rgb": {
    "r": 55,
    "g": 112,
    "b": 187
  },
  "hsl": {
    "h": 214.091,
    "s": 54.545,
    "l": 47.451
  },
  "oklch": {
    "l": 0.54437,
    "c": 0.13199,
    "h": 256.2
  },
  "luminance": 0.15988
}

Semantic roles & 50–950 ramp

primary

#3770BB

secondary

#C9AB85

accent

#9E4ADE

background

#F8F9FC

surface

#EFF2F9

border

#CACCD2

text

#0B0D14

muted

#7C7E82

Preview Lab

Preview with #3770BB

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

Preview Lab → · Contrast checker → · Palette generator →