What color is #51808F?

#51808F is a medium, muted cyan. In RGB it is rgb(81, 128, 143), and in HSL hsl(195, 28%, 44%).

Is #51808F accessible as text?

On white, #51808F has a contrast ratio of 4.34:1 (fails WCAG AA for body text); on black it is 4.83:1 (passes). For text placed on #51808F, use black for the best readability.

What is the closest Tailwind color to #51808F?

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

What colors go well with #51808F?

#51808F pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #906051. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #51808F below.

Is #51808F good for buttons?

#51808F works well for buttons and highlights, but use black text on #51808F — white text only reaches 4.34:1, below the 4.5:1 needed for normal-size labels.

Is #51808F the same as CSS slategray?

No — #51808F 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.

#51808F Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #51808F

Not just a swatch — here's how #51808F works with other colors. Named schemes with #51808F in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #51808F 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 #51808F 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 #51808F Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #79A4B2

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 #51808F Secondary #705116 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 #51808F Secondary #95A5AB 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 #51808F 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 48/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 47/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 22/100

Low

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

UI accent fit 73/100

High

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

Surface fit 42/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 85/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #51808F

For UI

For branding

For interior

For fashion

People also use #51808F with

Cadet Blue Lapis Lazuli Raw Umber Platinum Dark Slate Gray

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 #DDE5E8 for cards and hover fills. Tint 80

Avoid beside #516B90 — 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 #51808F 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: #51808F;
  --color-base-rgb: 81 128 143;
  --color-base-oklch: oklch(57.2% 0.056 220.1);
  --color-50: #F5F9FA;
  --color-100: #E5EEF1;
  --color-200: #CBDCE2;
  --color-300: #A6C1CA;
  --color-400: #82A5B0;
  --color-500: #628793;
  --color-600: #4F6A72;
  --color-700: #3C4D53;
  --color-800: #2A3437;
  --color-900: #1B2022;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  slate-gray: {
    50: '#F5F9FA',
    100: '#E5EEF1',
    200: '#CBDCE2',
    300: '#A6C1CA',
    400: '#82A5B0',
    500: '#628793',
    600: '#4F6A72',
    700: '#3C4D53',
    800: '#2A3437',
    900: '#1B2022',
  },
}

$base: #51808F;
$base-ink: #141310;
$base-50: #F5F9FA;
$base-100: #E5EEF1;
$base-200: #CBDCE2;
$base-300: #A6C1CA;
$base-400: #82A5B0;
$base-500: #628793;
$base-600: #4F6A72;
$base-700: #3C4D53;
$base-800: #2A3437;
$base-900: #1B2022;
$base-hover: #416673;
$base-subtle: #CBD9DD;

{
    "color": {
        "base": {
            "value": "#51808F",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F9FA",
                "type": "color"
            },
            "100": {
                "value": "#E5EEF1",
                "type": "color"
            },
            "200": {
                "value": "#CBDCE2",
                "type": "color"
            },
            "300": {
                "value": "#A6C1CA",
                "type": "color"
            },
            "400": {
                "value": "#82A5B0",
                "type": "color"
            },
            "500": {
                "value": "#628793",
                "type": "color"
            },
            "600": {
                "value": "#4F6A72",
                "type": "color"
            },
            "700": {
                "value": "#3C4D53",
                "type": "color"
            },
            "800": {
                "value": "#2A3437",
                "type": "color"
            },
            "900": {
                "value": "#1B2022",
                "type": "color"
            }
        }
    }
}

Palettes built on #51808F

Color Lab

Pairs with #51808F

UI roles & guardrails

In real applications

Scales

Every model

Export