Palettes / Colors / #577BBB

#577BBB — Muted Blue

#577BBB is a blue color we call Muted Blue, closest to the named color SteelBlue (#4682B4). It belongs to the blue family.

Color name

Closest CSS keyword: steelblue (#4682B4) — not an exact match. CSS steelblue gives you #4682B4, a different color; use #577BBB when you need this exact shade.

Sources: common names follow widely used color-name references; CSS keywords and their hex values follow the CSS Color specification.

#577BBB is a cool blue color associated with trust, calm and professionalism. It sits comfortably in the middle: usable for large areas in soft schemes, or as a supporting color beside something stronger.

Its strongest partner is its complement #BB9758; it also sits naturally between #58AEBB and #6658BB. In the palettes below you can see it working alongside real color combinations from our collection.

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Color values

RGB & CMYK percentages

Red 34% · Green 48% · Blue 73%

Cyan 53% · Magenta 34% · Yellow 0% · Key 27%

CMYK values are unprofiled approximations for screen reference — not a print-proofing guarantee.

Previews

CSS code for #577BBB

.text { color: #577BBB; }
.background { background-color: #577BBB; }
.border { border: 3px solid #577BBB; }
.text-rgb { color: rgb(87, 123, 187); }
.text-hsl { color: hsl(218, 42%, 54%); }
.text-shadow-hex { text-shadow: 4px 4px 2px #577BBB; }
.text-shadow-rgba { text-shadow: 4px 4px 2px rgba(87, 123, 187, 0.8); }
.box-shadow-hex { box-shadow: 1px 1px 3px 2px #577BBB; }
.box-shadow-rgba { box-shadow: 1px 1px 3px 2px rgba(87, 123, 187, 0.8); }

HTML: <p style="color:#577BBB">Text here</p> · <div style="background-color:#577BBB">Div content here</div>

Shades of #577BBB

Tints of #577BBB

Tones of #577BBB

Color harmonies

Complementary — #BB9758:

Analogous:

Triadic:

Contrast & accessibility

Best text color on #577BBB: #000000.

Semi-transparent (opacity) text on #577BBB

Text set with opacity blends into the background, so its real contrast is lower than the solid ratios above. Choose a text color and an opacity to see the blended color and its true ratio:

How #577BBB looks with color blindness

Simulated with standard Machado color-vision-deficiency matrices — useful when this color carries meaning in charts, maps or interfaces:

Closest design-system colors

The nearest matches in the Tailwind CSS, Material Design and Bootstrap palettes — handy when you need a framework class instead of a raw hex:

Palettes with a similar color

These palettes use a close neighbour of #577BBB rather than the exact color:

Similar colors

The closest colors that actually appear in our palette collection — click any to open its page:

Browse neighbouring colors

← #577BBA  ·  #577BBC →

Frequently asked questions

What color is #577BBB?

#577BBB is Muted Blue, a blue color (RGB 87, 123, 187). Its closest standard named color is SteelBlue.

What is the RGB and HSL of #577BBB?

#577BBB is RGB 87, 123, 187 — HSL 218°, 42%, 54% — CMYK 53%, 34%, 0%, 27%.

What colors go with #577BBB?

Its complement is #BB9758; analogous partners are #58AEBB and #6658BB. It also appears in 6+ palettes in our collection.

Can I use #577BBB for text?

Black text on #577BBB has a contrast ratio of 4.96:1 (passes WCAG AA); white text gives 4.24:1.