#577FBB#577FBB

#577FBB is a mid, moderate blue. Relative luminance 0.208; OKLCH L 59.3% C 0.103 H 258.3°. Best body text is #000000 at 5.16:1 contrast (WCAG AA passes).

Color values

HEX	#577FBB
RGB	rgb(87, 127, 187)
HSL	hsl(216, 42%, 54%)
HSV	hsv(216, 53%, 73%)
CMYK	cmyk(53.5%, 32.1%, 0%, 26.7%)
CIE-LAB	lab(52.72, 3.58, -35.75)
CIE-LCH	lch(52.72, 35.93, 275.72°)
OKLab	oklab(59.32% -0.0209 -0.1007)
OKLCH	oklch(59.32% 0.103 258.3)
XYZ	xyz(20.4864, 20.7913, 49.9376)
Luminance	0.2079 (WCAG relative)
Temperature	cool
Family	blue

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#577FBB #BB9357

analogous

#57B1BB #577FBB #6157BB

triadic

#577FBB #BB577F #7FBB57

tetradic

#577FBB #BB57B1 #BB9357 #57BB61

square

#577FBB #BB57B1 #BB9357 #57BB61

split-complementary

#577FBB #BB6157 #B1BB57

monochromatic

#2C456C #3D6197 #577FBB #83A0CD #AEC1DE

Accessibility & contrast

On white

4.07

#577FBB on #FFFFFF

AA ✗AA large ✓AAA ✗

On black

5.16

#577FBB on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #577FBB

5.16:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##577FBB	#FFFFFF	#000000	##000000
##577FBB	1.00	4.07	5.16	5.16
#FFFFFF	4.07	1.00	21.00	21.00
#000000	5.16	21.00	1.00	1.00
##000000	5.16	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#6783BE

Deuteranopia (green-blind)

#5B7ABA

Tritanopia (blue-blind)

#208C94

Achromatopsia (no color)

#7E7E7E

Design tokens & code

CSS

--color: #577fbb;
/* rgb */ color: rgb(87, 127, 187);
/* oklch */ color: oklch(59.3% 0.103 258.3);

Tailwind

colors: {
  custom: {
    50: '#8da3cf',
    500: '#577fbb',
    950: '#000000',
  },
}

SCSS

$custom: #577fbb;
$custom-light: #8da3cf;
$custom-dark: #000000;

JSON

{
  "hex": "#577fbb",
  "rgb": {
    "r": 87,
    "g": 127,
    "b": 187
  },
  "hsl": {
    "h": 216,
    "s": 42.373,
    "l": 53.725
  },
  "oklch": {
    "l": 0.59324,
    "c": 0.1028,
    "h": 258.3
  },
  "luminance": 0.20793
}

Semantic roles & 50–950 ramp

primary

#577FBB

secondary

#CCBBA2

accent

#A056D2

background

#F9FAFC

surface

#F1F3F9

border

#CBCDD2

text

#0D0F14

muted

#7E7F82

Preview Lab

Preview with #577FBB

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

Preview Lab → · Contrast checker → · Palette generator →