#3770C9#3770C9

#3770C9 is a mid, vivid blue. Relative luminance 0.166; OKLCH L 55.3% C 0.151 H 259.1°. Best body text is #FFFFFF at 4.86:1 contrast (WCAG AA passes).

Color values

HEX	#3770C9
RGB	rgb(55, 112, 201)
HSL	hsl(217, 57%, 50%)
HSV	hsv(217, 73%, 79%)
CMYK	cmyk(72.6%, 44.3%, 0%, 21.2%)
CIE-LAB	lab(47.77, 11.76, -51.72)
CIE-LCH	lch(47.77, 53.04, 282.82°)
OKLab	oklab(55.33% -0.0285 -0.1481)
OKLCH	oklch(55.33% 0.151 259.1)
XYZ	xyz(17.9085, 16.6157, 57.5103)
Luminance	0.1662 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3770C9 #C99037

analogous

#37B9C9 #3770C9 #4737C9

triadic

#3770C9 #C93770 #70C937

tetradic

#3770C9 #C937B9 #C99037 #37C947

square

#3770C9 #C937B9 #C99037 #37C947

split-complementary

#3770C9 #C94737 #B9C937

monochromatic

#1C3A69 #295599 #3770C9 #6792D6 #97B5E3

Accessibility & contrast

On white

4.86

#3770C9 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.32

#3770C9 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3770C9

4.86:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3770C9	#FFFFFF	#000000	##FFFFFF
##3770C9	1.00	4.86	4.32	4.86
#FFFFFF	4.86	1.00	21.00	1.00
#000000	4.32	21.00	1.00	21.00
##FFFFFF	4.86	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#4379CC

Deuteranopia (green-blind)

#276BC7

Tritanopia (blue-blind)

#008593

Achromatopsia (no color)

#717171

Design tokens & code

CSS

--color: #3770c9;
/* rgb */ color: rgb(55, 112, 201);
/* oklch */ color: oklch(55.3% 0.151 259.1);

Tailwind

colors: {
  custom: {
    50: '#8098da',
    500: '#3770c9',
    950: '#000000',
  },
}

SCSS

$custom: #3770c9;
$custom-light: #8098da;
$custom-dark: #000000;

JSON

{
  "hex": "#3770c9",
  "rgb": {
    "r": 55,
    "g": 112,
    "b": 201
  },
  "hsl": {
    "h": 216.575,
    "s": 57.48,
    "l": 50.196
  },
  "oklch": {
    "l": 0.55332,
    "c": 0.15078,
    "h": 259.1
  },
  "luminance": 0.16618
}

Semantic roles & 50–950 ramp

primary

#3770C9

secondary

#CFB58D

accent

#A547E1

background

#F8F9FD

surface

#F0F2FB

border

#CBCCD4

text

#0C0D15

muted

#7D7E83

Preview Lab

Preview with #3770C9

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

Preview Lab → · Contrast checker → · Palette generator →