#577CB9#577CB9

#577CB9 is a mid, moderate blue. Relative luminance 0.199; OKLCH L 58.6% C 0.103 H 260.0°. Best body text is #000000 at 4.99:1 contrast (WCAG AA passes).

Color values

HEX	#577CB9
RGB	rgb(87, 124, 185)
HSL	hsl(217, 41%, 53%)
HSV	hsv(217, 53%, 73%)
CMYK	cmyk(53%, 33%, 0%, 27.5%)
CIE-LAB	lab(51.77, 4.74, -36.09)
CIE-LCH	lch(51.77, 36.40, 277.48°)
OKLab	oklab(58.55% -0.0179 -0.1017)
OKLCH	oklch(58.55% 0.103 260)
XYZ	xyz(19.8921, 19.9428, 48.6907)
Luminance	0.1994 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#577CB9 #B99457

analogous

#57ADB9 #577CB9 #6357B9

triadic

#577CB9 #B9577C #7CB957

tetradic

#577CB9 #B957AD #B99457 #57B963

square

#577CB9 #B957AD #B99457 #57B963

split-complementary

#577CB9 #B96357 #ADB957

monochromatic

#2C436A #3E5F95 #577CB9 #829ECB #ADBFDD

Accessibility & contrast

On white

4.21

#577CB9 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.99

#577CB9 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #577CB9

4.99:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##577CB9	#FFFFFF	#000000	##000000
##577CB9	1.00	4.21	4.99	4.99
#FFFFFF	4.21	1.00	21.00	21.00
#000000	4.99	21.00	1.00	1.00
##000000	4.99	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6480BC

Deuteranopia (green-blind)

#5877B8

Tritanopia (blue-blind)

#248992

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #577cb9;
/* rgb */ color: rgb(87, 124, 185);
/* oklch */ color: oklch(58.6% 0.103 260.0);

Tailwind

colors: {
  custom: {
    50: '#8da1ce',
    500: '#577cb9',
    950: '#000000',
  },
}

SCSS

$custom: #577cb9;
$custom-light: #8da1ce;
$custom-dark: #000000;

JSON

{
  "hex": "#577cb9",
  "rgb": {
    "r": 87,
    "g": 124,
    "b": 185
  },
  "hsl": {
    "h": 217.347,
    "s": 41.176,
    "l": 53.333
  },
  "oklch": {
    "l": 0.58554,
    "c": 0.10323,
    "h": 260
  },
  "luminance": 0.19944
}

Semantic roles & 50–950 ramp

primary

#577CB9

secondary

#CBBBA1

accent

#A357D1

background

#F8F9FC

surface

#F0F2F9

border

#CBCCD2

text

#0D0E13

muted

#7D7E82

Preview Lab

Preview with #577CB9

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

Preview Lab → · Contrast checker → · Palette generator →