#577BBB#577BBB

#577BBB is a mid, moderate blue. Relative luminance 0.198; OKLCH L 58.4% C 0.107 H 261.3°. Best body text is #000000 at 4.96:1 contrast (WCAG AA passes).

Color values

HEX	#577BBB
RGB	rgb(87, 123, 187)
HSL	hsl(218, 42%, 54%)
HSV	hsv(218, 53%, 73%)
CMYK	cmyk(53.5%, 34.2%, 0%, 26.7%)
CIE-LAB	lab(51.59, 5.98, -37.53)
CIE-LCH	lch(51.59, 38.01, 279.05°)
OKLab	oklab(58.44% -0.0162 -0.1059)
OKLCH	oklch(58.44% 0.107 261.3)
XYZ	xyz(19.9800, 19.7785, 49.7688)
Luminance	0.1978 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#577BBB #BB9757

analogous

#57ADBB #577BBB #6557BB

triadic

#577BBB #BB577B #7BBB57

tetradic

#577BBB #BB57AD #BB9757 #57BB65

square

#577BBB #BB57AD #BB9757 #57BB65

split-complementary

#577BBB #BB6557 #ADBB57

monochromatic

#2C436C #3D5E97 #577BBB #839DCD #AEBFDE

Accessibility & contrast

On white

4.24

#577BBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

4.96

#577BBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #577BBB

4.96:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##577BBB	#FFFFFF	#000000	##000000
##577BBB	1.00	4.24	4.96	4.96
#FFFFFF	4.24	1.00	21.00	21.00
#000000	4.96	21.00	1.00	1.00
##000000	4.96	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6280BE

Deuteranopia (green-blind)

#5677BA

Tritanopia (blue-blind)

#228992

Achromatopsia (no color)

#7B7B7B

Design tokens & code

CSS

--color: #577bbb;
/* rgb */ color: rgb(87, 123, 187);
/* oklch */ color: oklch(58.4% 0.107 261.3);

Tailwind

colors: {
  custom: {
    50: '#8da0d0',
    500: '#577bbb',
    950: '#000000',
  },
}

SCSS

$custom: #577bbb;
$custom-light: #8da0d0;
$custom-dark: #000000;

JSON

{
  "hex": "#577bbb",
  "rgb": {
    "r": 87,
    "g": 123,
    "b": 187
  },
  "hsl": {
    "h": 218.4,
    "s": 42.373,
    "l": 53.725
  },
  "oklch": {
    "l": 0.5844,
    "c": 0.1071,
    "h": 261.3
  },
  "luminance": 0.1978
}

Semantic roles & 50–950 ramp

primary

#577BBB

secondary

#CCBDA2

accent

#A556D2

background

#F9F9FC

surface

#F1F2F9

border

#CBCCD2

text

#0D0E14

muted

#7E7E82

Preview Lab

Preview with #577BBB

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

Preview Lab → · Contrast checker → · Palette generator →