#577BB5#577BB5

#577BB5 is a mid, moderate blue. Relative luminance 0.195; OKLCH L 58.1% C 0.099 H 259.6°. Best body text is #000000 at 4.91:1 contrast (WCAG AA passes).

Color values

HEX	#577BB5
RGB	rgb(87, 123, 181)
HSL	hsl(217, 39%, 53%)
HSV	hsv(217, 52%, 71%)
CMYK	cmyk(51.9%, 32%, 0%, 29%)
CIE-LAB	lab(51.30, 4.07, -34.53)
CIE-LCH	lch(51.30, 34.77, 276.71°)
OKLab	oklab(58.12% -0.0178 -0.0971)
OKLCH	oklch(58.12% 0.099 259.6)
XYZ	xyz(19.3511, 19.5269, 46.4565)
Luminance	0.1953 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#577BB5 #B59157

analogous

#57AAB5 #577BB5 #6257B5

triadic

#577BB5 #B5577B #7BB557

tetradic

#577BB5 #B557AA #B59157 #57B562

square

#577BB5 #B557AA #B59157 #57B562

split-complementary

#577BB5 #B56257 #AAB557

monochromatic

#2D4265 #3F5E90 #577BB5 #819CC8 #ACBEDA

Accessibility & contrast

On white

4.28

#577BB5 on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.91

#577BB5 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #577BB5

4.91:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##577BB5	#FFFFFF	#000000	##000000
##577BB5	1.00	4.28	4.91	4.91
#FFFFFF	4.28	1.00	21.00	21.00
#000000	4.91	21.00	1.00	1.00
##000000	4.91	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#647FB7

Deuteranopia (green-blind)

#5976B4

Tritanopia (blue-blind)

#298890

Achromatopsia (no color)

#7A7A7A

Design tokens & code

CSS

--color: #577bb5;
/* rgb */ color: rgb(87, 123, 181);
/* oklch */ color: oklch(58.1% 0.099 259.6);

Tailwind

colors: {
  custom: {
    50: '#8ca0cb',
    500: '#577bb5',
    950: '#000000',
  },
}

SCSS

$custom: #577bb5;
$custom-light: #8ca0cb;
$custom-dark: #000000;

JSON

{
  "hex": "#577bb5",
  "rgb": {
    "r": 87,
    "g": 123,
    "b": 181
  },
  "hsl": {
    "h": 217.021,
    "s": 38.843,
    "l": 52.549
  },
  "oklch": {
    "l": 0.58122,
    "c": 0.09877,
    "h": 259.6
  },
  "luminance": 0.19528
}

Semantic roles & 50–950 ramp

primary

#577BB5

secondary

#C8B99F

accent

#A259CF

background

#F8F9FC

surface

#F0F2F8

border

#CBCCD1

text

#0C0E13

muted

#7D7E82

Preview Lab

Preview with #577BB5

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

Preview Lab → · Contrast checker → · Palette generator →