What color is #577F8B?

#577F8B is a medium, muted cyan. In RGB it is rgb(87, 127, 139), and in HSL hsl(194, 23%, 44%).

Is #577F8B accessible as text?

On white, #577F8B has a contrast ratio of 4.36:1 (fails WCAG AA for body text); on black it is 4.81:1 (passes). For text placed on #577F8B, use black for the best readability.

What is the closest Tailwind color to #577F8B?

The nearest Tailwind CSS token is mist-500 (#67787C).

What colors go well with #577F8B?

#577F8B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8A6256. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #577F8B below.

Is #577F8B good for buttons?

#577F8B works well for buttons and highlights, but use black text on #577F8B — white text only reaches 4.36:1, below the 4.5:1 needed for normal-size labels.

Is #577F8B the same as CSS slategray?

No — #577F8B is not the CSS named color slategray, but slategray (#708090) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#577F8B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #577F8B

Not just a swatch — here's how #577F8B works with other colors. Named schemes with #577F8B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #577F8B Accent #A6C4BF Surface #DFDABF Secondary #9AA0A0 Anchor #1E354A

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

Nordic Calm Accent · 5 colors

Accent #577F8B Secondary #AEB4B8 Surface #F1F2F0 Support #7B94A5 Anchor #2E3236

Slate Gray keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #577F8B Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #7EA3AE

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

Vintage Leather Lead · 5 colors

Lead #577F8B Secondary #705116 Surface #E3DCC0 Accent #395244 Anchor #56233E

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

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #577F8B Secondary #97A5A9 Support #969386 Ink #16140F

Slate Gray 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 Slate Gray carrying the quiet middle.

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Color Lab

How #577F8B 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 36/100

Cool

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

Softness 55/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 41/100

Moderate

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

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 46/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 19/100

Very low

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

UI accent fit 69/100

High

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

Surface fit 45/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 87/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #577F8B

For UI

For branding

For interior

For fashion

People also use #577F8B with

Cadet Blue Lapis Lazuli Raw Umber Platinum 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 white text at 4.4:1. Use

Subtle surface Use #DEE5E7 for cards and hover fills. Tint 80

Avoid beside #566D8A — 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 #577F8B 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: #577F8B;
  --color-base-rgb: 87 127 139;
  --color-base-oklch: oklch(57.1% 0.048 218.5);
  --color-50: #F5F8F9;
  --color-100: #E6EDF0;
  --color-200: #CDDBE0;
  --color-300: #A9C0C6;
  --color-400: #86A3AC;
  --color-500: #66858F;
  --color-600: #53696F;
  --color-700: #3E4C51;
  --color-800: #2B3336;
  --color-900: #1B2022;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  slate-gray: {
    50: '#F5F8F9',
    100: '#E6EDF0',
    200: '#CDDBE0',
    300: '#A9C0C6',
    400: '#86A3AC',
    500: '#66858F',
    600: '#53696F',
    700: '#3E4C51',
    800: '#2B3336',
    900: '#1B2022',
  },
}

$base: #577F8B;
$base-ink: #141310;
$base-50: #F5F8F9;
$base-100: #E6EDF0;
$base-200: #CDDBE0;
$base-300: #A9C0C6;
$base-400: #86A3AC;
$base-500: #66858F;
$base-600: #53696F;
$base-700: #3E4C51;
$base-800: #2B3336;
$base-900: #1B2022;
$base-hover: #45656E;
$base-subtle: #CDD8DC;

{
    "color": {
        "base": {
            "value": "#577F8B",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F8F9",
                "type": "color"
            },
            "100": {
                "value": "#E6EDF0",
                "type": "color"
            },
            "200": {
                "value": "#CDDBE0",
                "type": "color"
            },
            "300": {
                "value": "#A9C0C6",
                "type": "color"
            },
            "400": {
                "value": "#86A3AC",
                "type": "color"
            },
            "500": {
                "value": "#66858F",
                "type": "color"
            },
            "600": {
                "value": "#53696F",
                "type": "color"
            },
            "700": {
                "value": "#3E4C51",
                "type": "color"
            },
            "800": {
                "value": "#2B3336",
                "type": "color"
            },
            "900": {
                "value": "#1B2022",
                "type": "color"
            }
        }
    }
}

Palettes built on #577F8B

Color Lab

Pairs with #577F8B

UI roles & guardrails

In real applications

Scales

Every model

Export