#3577B3#3577B3

#3577B3 is a mid, moderate cyan. Relative luminance 0.172; OKLCH L 55.5% C 0.115 H 248.8°. Best body text is #FFFFFF at 4.73:1 contrast (WCAG AA passes).

Color values

HEX	#3577B3
RGB	rgb(53, 119, 179)
HSL	hsl(209, 54%, 45%)
HSV	hsv(209, 70%, 70%)
CMYK	cmyk(70.4%, 33.5%, 0%, 29.8%)
CIE-LAB	lab(48.52, -0.87, -37.86)
CIE-LCH	lch(48.52, 37.87, 268.69°)
OKLab	oklab(55.5% -0.0417 -0.1073)
OKLCH	oklch(55.5% 0.115 248.8)
XYZ	xyz(16.1986, 17.2035, 45.1060)
Luminance	0.1721 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#3577B3 #B37135

analogous

#35B3B0 #3577B3 #3538B3

triadic

#3577B3 #B33577 #77B335

tetradic

#3577B3 #B035B3 #B37135 #38B335

square

#3577B3 #B035B3 #B37135 #38B335

split-complementary

#3577B3 #B33538 #B3B035

monochromatic

#193855 #275884 #3577B3 #5895CD #87B3DB

Accessibility & contrast

On white

4.73

#3577B3 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.44

#3577B3 on #000000

AA ✗AA large ✓AAA ✗

Best text color

#FFFFFF on #3577B3

4.73:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##3577B3	#FFFFFF	#000000	##FFFFFF
##3577B3	1.00	4.73	4.44	4.73
#FFFFFF	4.73	1.00	21.00	1.00
#000000	4.44	21.00	1.00	21.00
##FFFFFF	4.73	1.00	21.00	1.00

Color blindness preview

Protanopia (red-blind)

#5C7AB6

Deuteranopia (green-blind)

#4A6EB2

Tritanopia (blue-blind)

#00858D

Achromatopsia (no color)

#737373

Design tokens & code

CSS

--color: #3577b3;
/* rgb */ color: rgb(53, 119, 179);
/* oklch */ color: oklch(55.5% 0.115 248.8);

Tailwind

colors: {
  custom: {
    50: '#7b9dca',
    500: '#3577b3',
    950: '#000000',
  },
}

SCSS

$custom: #3577b3;
$custom-light: #7b9dca;
$custom-dark: #000000;

JSON

{
  "hex": "#3577b3",
  "rgb": {
    "r": 53,
    "g": 119,
    "b": 179
  },
  "hsl": {
    "h": 208.571,
    "s": 54.31,
    "l": 45.49
  },
  "oklch": {
    "l": 0.55496,
    "c": 0.11516,
    "h": 248.8
  },
  "luminance": 0.17205
}

Semantic roles & 50–950 ramp

primary

#3577B3

secondary

#C5A07F

accent

#904ADE

background

#F8F9FC

surface

#EFF2F8

border

#CACCD1

text

#0A0E13

muted

#7C7E82

Preview Lab

Preview with #3577B3

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

Preview Lab → · Contrast checker → · Palette generator →