#577CCB#577CCB

#577CCB is a mid, vivid blue. Relative luminance 0.208; OKLCH L 59.6% C 0.128 H 264.0°. Best body text is #000000 at 5.15:1 contrast (WCAG AA passes).

Color values

HEX	#577CCB
RGB	rgb(87, 124, 203)
HSL	hsl(221, 53%, 57%)
HSV	hsv(221, 57%, 80%)
CMYK	cmyk(57.1%, 38.9%, 0%, 20.4%)
CIE-LAB	lab(52.68, 10.57, -44.96)
CIE-LCH	lch(52.68, 46.18, 283.24°)
OKLab	oklab(59.55% -0.0135 -0.1275)
OKLCH	oklch(59.55% 0.128 264)
XYZ	xyz(21.9139, 20.7516, 59.3390)
Luminance	0.2075 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#577CCB #CBA657

analogous

#57B6CB #577CCB #6C57CB

triadic

#577CCB #CB577C #7CCB57

tetradic

#577CCB #CB57B6 #CBA657 #57CB6C

square

#577CCB #CB57B6 #CBA657 #57CB6C

split-complementary

#577CCB #CB6C57 #B6CB57

monochromatic

#284480 #365DAF #577CCB #86A0D9 #B4C5E8

Accessibility & contrast

On white

4.08

#577CCB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.15

#577CCB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #577CCB

5.15:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##577CCB	#FFFFFF	#000000	##000000
##577CCB	1.00	4.08	5.15	5.15
#FFFFFF	4.08	1.00	21.00	21.00
#000000	5.15	21.00	1.00	1.00
##000000	5.15	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#5B83CE

Deuteranopia (green-blind)

#4C79C9

Tritanopia (blue-blind)

#008D9A

Achromatopsia (no color)

#7E7E7E

Design tokens & code

CSS

--color: #577ccb;
/* rgb */ color: rgb(87, 124, 203);
/* oklch */ color: oklch(59.6% 0.128 264.0);

Tailwind

colors: {
  custom: {
    50: '#8fa1db',
    500: '#577ccb',
    950: '#000000',
  },
}

SCSS

$custom: #577ccb;
$custom-light: #8fa1db;
$custom-dark: #000000;

JSON

{
  "hex": "#577ccb",
  "rgb": {
    "r": 87,
    "g": 124,
    "b": 203
  },
  "hsl": {
    "h": 220.862,
    "s": 52.727,
    "l": 56.863
  },
  "oklch": {
    "l": 0.59551,
    "c": 0.12823,
    "h": 264
  },
  "luminance": 0.20753
}

Semantic roles & 50–950 ramp

primary

#577CCB

secondary

#D7C7A7

accent

#AE4CDC

background

#F9F9FD

surface

#F1F2FB

border

#CBCCD4

text

#0D0E15

muted

#7E7E83

Preview Lab

Preview with #577CCB

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

Preview Lab → · Contrast checker → · Palette generator →