What color is #577F91?

#577F91 is a medium, muted cyan-blue. In RGB it is rgb(87, 127, 145), and in HSL hsl(199, 25%, 45%).

Is #577F91 accessible as text?

On white, #577F91 has a contrast ratio of 4.33:1 (fails WCAG AA for body text); on black it is 4.85:1 (passes). For text placed on #577F91, use black for the best readability.

What is the closest Tailwind color to #577F91?

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

What colors go well with #577F91?

#577F91 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8F6856. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #577F91 below.

Is #577F91 good for buttons?

#577F91 works well for buttons and highlights, but use black text on #577F91 — white text only reaches 4.33:1, below the 4.5:1 needed for normal-size labels.

Is #577F91 the same as CSS slategray?

No — #577F91 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.

#577F91 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #577F91

Not just a swatch — here's how #577F91 works with other colors. Named schemes with #577F91 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #577F91 Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

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 #577F91 Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 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 #577F91 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #7EA3B4

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 #577F91 Secondary #6F5216 Surface #E2DCC0 Accent #385244 Anchor #56233D

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 #577F91 Secondary #97A5AC 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 #577F91 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 34/100

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 20/100

Low

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

UI accent fit 71/100

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 86/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #577F91

For UI

For branding

For interior

For fashion

People also use #577F91 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 4.3:1. Use

Subtle surface Use #DEE5E8 for cards and hover fills. Tint 80

Avoid beside #566A8F — 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 #577F91 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: #577F91;
  --color-base-rgb: 87 127 145;
  --color-base-oklch: oklch(57.4% 0.052 227.8);
  --color-50: #F5F8F9;
  --color-100: #E5EDF0;
  --color-200: #CCDAE0;
  --color-300: #A7BEC8;
  --color-400: #84A1AE;
  --color-500: #648290;
  --color-600: #516770;
  --color-700: #3D4B51;
  --color-800: #2A3336;
  --color-900: #1B2022;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  slate-gray: {
    50: '#F5F8F9',
    100: '#E5EDF0',
    200: '#CCDAE0',
    300: '#A7BEC8',
    400: '#84A1AE',
    500: '#648290',
    600: '#516770',
    700: '#3D4B51',
    800: '#2A3336',
    900: '#1B2022',
  },
}

$base: #577F91;
$base-ink: #141310;
$base-50: #F5F8F9;
$base-100: #E5EDF0;
$base-200: #CCDAE0;
$base-300: #A7BEC8;
$base-400: #84A1AE;
$base-500: #648290;
$base-600: #516770;
$base-700: #3D4B51;
$base-800: #2A3336;
$base-900: #1B2022;
$base-hover: #456473;
$base-subtle: #CDD8DD;

{
    "color": {
        "base": {
            "value": "#577F91",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F8F9",
                "type": "color"
            },
            "100": {
                "value": "#E5EDF0",
                "type": "color"
            },
            "200": {
                "value": "#CCDAE0",
                "type": "color"
            },
            "300": {
                "value": "#A7BEC8",
                "type": "color"
            },
            "400": {
                "value": "#84A1AE",
                "type": "color"
            },
            "500": {
                "value": "#648290",
                "type": "color"
            },
            "600": {
                "value": "#516770",
                "type": "color"
            },
            "700": {
                "value": "#3D4B51",
                "type": "color"
            },
            "800": {
                "value": "#2A3336",
                "type": "color"
            },
            "900": {
                "value": "#1B2022",
                "type": "color"
            }
        }
    }
}

Palettes built on #577F91

Color Lab

Pairs with #577F91

UI roles & guardrails

In real applications

Scales

Every model

Export