#577BC9#577BC9

#577BC9 is a mid, vivid blue. Relative luminance 0.204; OKLCH L 59.2% C 0.127 H 264.2°. Best body text is #000000 at 5.08:1 contrast (WCAG AA passes).

Color values

HEX	#577BC9
RGB	rgb(87, 123, 201)
HSL	hsl(221, 51%, 56%)
HSV	hsv(221, 57%, 79%)
CMYK	cmyk(56.7%, 38.8%, 0%, 21.2%)
CIE-LAB	lab(52.29, 10.53, -44.42)
CIE-LCH	lch(52.29, 45.65, 283.33°)
OKLab	oklab(59.22% -0.0128 -0.126)
OKLCH	oklch(59.22% 0.127 264.2)
XYZ	xyz(21.5525, 20.4075, 58.0503)
Luminance	0.2041 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#577BC9 #C9A557

analogous

#57B4C9 #577BC9 #6C57C9

triadic

#577BC9 #C9577B #7BC957

tetradic

#577BC9 #C957B4 #C9A557 #57C96C

square

#577BC9 #C957B4 #C9A557 #57C96C

split-complementary

#577BC9 #C96C57 #B4C957

monochromatic

#28437D #375CAC #577BC9 #859FD8 #B4C4E7

Accessibility & contrast

On white

4.13

#577BC9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.08

#577BC9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #577BC9

5.08:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##577BC9	#FFFFFF	#000000	##000000
##577BC9	1.00	4.13	5.08	5.08
#FFFFFF	4.13	1.00	21.00	21.00
#000000	5.08	21.00	1.00	1.00
##000000	5.08	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5A82CC

Deuteranopia (green-blind)

#4C78C7

Tritanopia (blue-blind)

#008C98

Achromatopsia (no color)

#7D7D7D

Design tokens & code

CSS

--color: #577bc9;
/* rgb */ color: rgb(87, 123, 201);
/* oklch */ color: oklch(59.2% 0.127 264.2);

Tailwind

colors: {
  custom: {
    50: '#8fa0da',
    500: '#577bc9',
    950: '#000000',
  },
}

SCSS

$custom: #577bc9;
$custom-light: #8fa0da;
$custom-dark: #000000;

JSON

{
  "hex": "#577bc9",
  "rgb": {
    "r": 87,
    "g": 123,
    "b": 201
  },
  "hsl": {
    "h": 221.053,
    "s": 51.351,
    "l": 56.471
  },
  "oklch": {
    "l": 0.59222,
    "c": 0.12662,
    "h": 264.2
  },
  "luminance": 0.20409
}

Semantic roles & 50–950 ramp

primary

#577BC9

secondary

#D5C7A7

accent

#AE4DDB

background

#F9F9FD

surface

#F1F2FA

border

#CBCCD3

text

#0D0E15

muted

#7E7E83

Preview Lab

Preview with #577BC9

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

Preview Lab → · Contrast checker → · Palette generator →