What color is #577BB9?

#577BB9 is a medium blue. In RGB it is rgb(87, 123, 185), and in HSL hsl(218, 41%, 53%).

Is #577BB9 accessible as text?

On white, #577BB9 has a contrast ratio of 4.25:1 (fails WCAG AA for body text); on black it is 4.94:1 (passes). For text placed on #577BB9, use black for the best readability.

What is the closest Tailwind color to #577BB9?

The nearest Tailwind CSS token is sky-600 (#0084D1).

What colors go well with #577BB9?

#577BB9 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B89456. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #577BB9 below.

Is #577BB9 good for buttons?

#577BB9 works well for buttons and highlights, but use black text on #577BB9 — white text only reaches 4.25:1, below the 4.5:1 needed for normal-size labels.

Is #577BB9 the same as CSS steelblue?

No — #577BB9 is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#577BB9 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #577BB9

Not just a swatch — here's how #577BB9 works with other colors. Named schemes with #577BB9 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #577BB9 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Glaucous opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Tech Product Signal · 5 colors

Signal #577BB9 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #7EA0DA

Glaucous is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Glaucous.

Vintage Leather Lead · 5 colors

Lead #577BB9 Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Glaucous plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Berry & Cream Lead · 5 colors

Lead #577BB9 Surface #F6E5D8 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

Glaucous sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #577BB9 Secondary #99A6BD Support #9D8F88 Ink #18140F

Glaucous is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Glaucous carrying the quiet middle.

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Color Lab

How #577BB9 actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.

Warmth 23/100

Cool

Reads cool and recessive — calming, technical, good for trust-led UI.

Softness 49/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 42/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 55/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 49/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 28/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 90/100

Very high

Strong interactive accent — visible and can carry a legible label.

Surface fit 29/100

Low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 80/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #577BB9

For UI

For branding

For interior

For fashion

People also use #577BB9 with

Lagoon Blue Tanzanite Camel Gainsboro Charcoal

UI roles & guardrails

Primary action Too mid-tone for a filled button — darken for the fill. AA Large

Body text Do not use for body copy on light surfaces. Avoid

Large display Fine for headings 24px+ on white. Pass

Background Pair with #141310 text at 4.4:1. Use

Subtle surface Use #E0E5EE for cards and hover fills. Tint 80

Avoid beside #5659B8 — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #577BB9 at work across the surfaces designers actually ship.

Website / UI

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Dashboard

Revenue

$48.2k ▲ 12%

Brand

AVELINE

Studio

Poster

Nov 14 · 8PM

NIGHT
MARKET

Packaging

BLOOM

Botanical Wash

250 ml

Interior

Every model

Export

:root {
  --color-base: #577BB9;
  --color-base-rgb: 87 123 185;
  --color-base-oklch: oklch(58.3% 0.104 260.8);
  --color-50: #F4F6FB;
  --color-100: #E2E8F3;
  --color-200: #C6D2E7;
  --color-300: #9DB1D2;
  --color-400: #7790BB;
  --color-500: #56719E;
  --color-600: #475A7A;
  --color-700: #374358;
  --color-800: #272E3A;
  --color-900: #191D24;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  glaucous: {
    50: '#F4F6FB',
    100: '#E2E8F3',
    200: '#C6D2E7',
    300: '#9DB1D2',
    400: '#7790BB',
    500: '#56719E',
    600: '#475A7A',
    700: '#374358',
    800: '#272E3A',
    900: '#191D24',
  },
}

$base: #577BB9;
$base-ink: #141310;
$base-50: #F4F6FB;
$base-100: #E2E8F3;
$base-200: #C6D2E7;
$base-300: #9DB1D2;
$base-400: #7790BB;
$base-500: #56719E;
$base-600: #475A7A;
$base-700: #374358;
$base-800: #272E3A;
$base-900: #191D24;
$base-hover: #406098;
$base-subtle: #D0D8E6;

{
    "color": {
        "base": {
            "value": "#577BB9",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F6FB",
                "type": "color"
            },
            "100": {
                "value": "#E2E8F3",
                "type": "color"
            },
            "200": {
                "value": "#C6D2E7",
                "type": "color"
            },
            "300": {
                "value": "#9DB1D2",
                "type": "color"
            },
            "400": {
                "value": "#7790BB",
                "type": "color"
            },
            "500": {
                "value": "#56719E",
                "type": "color"
            },
            "600": {
                "value": "#475A7A",
                "type": "color"
            },
            "700": {
                "value": "#374358",
                "type": "color"
            },
            "800": {
                "value": "#272E3A",
                "type": "color"
            },
            "900": {
                "value": "#191D24",
                "type": "color"
            }
        }
    }
}

Palettes built on #577BB9

Color Lab

Pairs with #577BB9

UI roles & guardrails

In real applications

Scales

Every model

Export