What color is #577D8B?

#577D8B is a medium, muted cyan-blue. In RGB it is rgb(87, 125, 139), and in HSL hsl(196, 23%, 44%).

Is #577D8B accessible as text?

On white, #577D8B has a contrast ratio of 4.46:1 (fails WCAG AA for body text); on black it is 4.71:1 (passes). For text placed on #577D8B, use black for the best readability.

What is the closest Tailwind color to #577D8B?

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

What colors go well with #577D8B?

#577D8B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8A6456. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #577D8B below.

Is #577D8B good for buttons?

#577D8B works well for buttons and highlights, but use black text on #577D8B — white text only reaches 4.46:1, below the 4.5:1 needed for normal-size labels.

Is #577D8B the same as CSS slategray?

No — #577D8B 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.

#577D8B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #577D8B

Not just a swatch — here's how #577D8B works with other colors. Named schemes with #577D8B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #577D8B Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1E344A

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 #577D8B Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A5 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 #577D8B Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #7EA1AE

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 #577D8B Secondary #6F5116 Surface #E2DCC0 Accent #385244 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 #577D8B Secondary #96A3A8 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.

Build a working theme in the generator →

Color Lab

How #577D8B 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 54/100

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 18/100

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 44/100

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 #577D8B

For UI

For branding

For interior

For fashion

People also use #577D8B with

Cadet Blue Ultra Violet 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 4.5:1. Use

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

Avoid beside #566B8A — 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 #577D8B 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: #577D8B;
  --color-base-rgb: 87 125 139;
  --color-base-oklch: oklch(56.7% 0.048 222.9);
  --color-50: #F5F8F9;
  --color-100: #E6EDF0;
  --color-200: #CDDBE0;
  --color-300: #A9BFC6;
  --color-400: #86A2AC;
  --color-500: #66848F;
  --color-600: #53686F;
  --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: '#A9BFC6',
    400: '#86A2AC',
    500: '#66848F',
    600: '#53686F',
    700: '#3E4C51',
    800: '#2B3336',
    900: '#1B2022',
  },
}

$base: #577D8B;
$base-ink: #141310;
$base-50: #F5F8F9;
$base-100: #E6EDF0;
$base-200: #CDDBE0;
$base-300: #A9BFC6;
$base-400: #86A2AC;
$base-500: #66848F;
$base-600: #53686F;
$base-700: #3E4C51;
$base-800: #2B3336;
$base-900: #1B2022;
$base-hover: #45636E;
$base-subtle: #CDD8DC;

{
    "color": {
        "base": {
            "value": "#577D8B",
            "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": "#A9BFC6",
                "type": "color"
            },
            "400": {
                "value": "#86A2AC",
                "type": "color"
            },
            "500": {
                "value": "#66848F",
                "type": "color"
            },
            "600": {
                "value": "#53686F",
                "type": "color"
            },
            "700": {
                "value": "#3E4C51",
                "type": "color"
            },
            "800": {
                "value": "#2B3336",
                "type": "color"
            },
            "900": {
                "value": "#1B2022",
                "type": "color"
            }
        }
    }
}

Palettes built on #577D8B

Color Lab

Pairs with #577D8B

UI roles & guardrails

In real applications

Scales

Every model

Export