#577BCB#577BCB

#577BCB is a mid, vivid blue. Relative luminance 0.205; OKLCH L 59.3% C 0.129 H 264.5°. Best body text is #000000 at 5.10:1 contrast (WCAG AA passes).

Color values

HEX	#577BCB
RGB	rgb(87, 123, 203)
HSL	hsl(221, 53%, 57%)
HSV	hsv(221, 57%, 80%)
CMYK	cmyk(57.1%, 39.4%, 0%, 20.4%)
CIE-LAB	lab(52.40, 11.18, -45.39)
CIE-LCH	lch(52.40, 46.75, 283.84°)
OKLab	oklab(59.34% -0.0124 -0.1288)
OKLCH	oklch(59.34% 0.129 264.5)
XYZ	xyz(21.7893, 20.5022, 59.2974)
Luminance	0.2050 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#577BCB #CBA757

analogous

#57B5CB #577BCB #6D57CB

triadic

#577BCB #CB577B #7BCB57

tetradic

#577BCB #CB57B5 #CBA757 #57CB6D

square

#577BCB #CB57B5 #CBA757 #57CB6D

split-complementary

#577BCB #CB6D57 #B5CB57

monochromatic

#284380 #365CAF #577BCB #86A0D9 #B4C4E8

Accessibility & contrast

On white

4.12

#577BCB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.10

#577BCB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #577BCB

5.10:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##577BCB	#FFFFFF	#000000	##000000
##577BCB	1.00	4.12	5.10	5.10
#FFFFFF	4.12	1.00	21.00	21.00
#000000	5.10	21.00	1.00	1.00
##000000	5.10	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5983CE

Deuteranopia (green-blind)

#4A78C9

Tritanopia (blue-blind)

#008D99

Achromatopsia (no color)

#7D7D7D

Design tokens & code

CSS

--color: #577bcb;
/* rgb */ color: rgb(87, 123, 203);
/* oklch */ color: oklch(59.3% 0.129 264.5);

Tailwind

colors: {
  custom: {
    50: '#8fa0db',
    500: '#577bcb',
    950: '#000000',
  },
}

SCSS

$custom: #577bcb;
$custom-light: #8fa0db;
$custom-dark: #000000;

JSON

{
  "hex": "#577bcb",
  "rgb": {
    "r": 87,
    "g": 123,
    "b": 203
  },
  "hsl": {
    "h": 221.379,
    "s": 52.727,
    "l": 56.863
  },
  "oklch": {
    "l": 0.59338,
    "c": 0.12941,
    "h": 264.5
  },
  "luminance": 0.20504
}

Semantic roles & 50–950 ramp

primary

#577BCB

secondary

#D7C8A7

accent

#AF4CDC

background

#F9F9FD

surface

#F1F2FB

border

#CBCCD4

text

#0D0E15

muted

#7E7E83

Preview Lab

Preview with #577BCB

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

Preview Lab → · Contrast checker → · Palette generator →