What color is #173D4E?

#173D4E is a dark cyan-blue. In RGB it is rgb(23, 61, 78), and in HSL hsl(199, 54%, 20%).

Is #173D4E accessible as text?

On white, #173D4E has a contrast ratio of 11.58:1 (passes WCAG AA for body text); on black it is 1.81:1 (fails). For text placed on #173D4E, use white for the best readability.

What is the closest Tailwind color to #173D4E?

The nearest Tailwind CSS token is cyan-950 (#053345).

What colors go well with #173D4E?

#173D4E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4F2917. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #173D4E below.

Is #173D4E good for buttons?

#173D4E works well for buttons and highlights, but use white text on #173D4E — black text only reaches 1.81:1, below the 4.5:1 needed for normal-size labels.

Is #173D4E the same as CSS darkslategray?

No — #173D4E is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#173D4E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #173D4E

Not just a swatch — here's how #173D4E works with other colors. Named schemes with #173D4E in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #173D4E Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

Gunmetal 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 #173D4E Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 Anchor #2E3236

Gunmetal 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 #173D4E Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #3C5D6E

Gunmetal 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 Gunmetal Gray.

Vintage Leather Lead · 5 colors

Lead #173D4E Secondary #6F5216 Surface #E2DCC0 Accent #385244 Anchor #56233D

Gunmetal 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 #173D4E Secondary #546066 Support #969386 Ink #16140F

Gunmetal 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 Gunmetal Gray carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #173D4E 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 35/100

Cool

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

Softness 34/100

Low

Middle-weight — neither delicate nor heavy.

Depth 63/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 33/100

Low

A faint retro warmth without tipping into sepia.

Luxury 66/100

High

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 20/100

Low

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

UI accent fit 39/100

Low

Workable accent with care around contrast.

Surface fit 47/100

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 #173D4E

For UI

For branding

For interior

For fashion

People also use #173D4E with

Pine Green Navy Espresso Platinum Charcoal

UI roles & guardrails

Primary action Safe as a filled button with white label. AAA

Body text Passes on white at 16px and above. Pass

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

Background Pair with white text at 11.6:1. Use

Subtle surface Use #C6DCE6 for cards and hover fills. Tint 80

Avoid beside #172B4F — 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 #173D4E 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: #173D4E;
  --color-base-rgb: 23 61 78;
  --color-base-oklch: oklch(34.1% 0.052 230.3);
  --color-50: #F3F9FC;
  --color-100: #DFEFF6;
  --color-200: #C0DEEC;
  --color-300: #95C4DA;
  --color-400: #6CA9C6;
  --color-500: #4B8CAA;
  --color-600: #3F6D83;
  --color-700: #324F5D;
  --color-800: #23353D;
  --color-900: #172126;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  gunmetal-gray: {
    50: '#F3F9FC',
    100: '#DFEFF6',
    200: '#C0DEEC',
    300: '#95C4DA',
    400: '#6CA9C6',
    500: '#4B8CAA',
    600: '#3F6D83',
    700: '#324F5D',
    800: '#23353D',
    900: '#172126',
  },
}

$base: #173D4E;
$base-ink: #FFFFFF;
$base-50: #F3F9FC;
$base-100: #DFEFF6;
$base-200: #C0DEEC;
$base-300: #95C4DA;
$base-400: #6CA9C6;
$base-500: #4B8CAA;
$base-600: #3F6D83;
$base-700: #324F5D;
$base-800: #23353D;
$base-900: #172126;
$base-hover: #13313F;
$base-subtle: #A9CBDB;

{
    "color": {
        "base": {
            "value": "#173D4E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F9FC",
                "type": "color"
            },
            "100": {
                "value": "#DFEFF6",
                "type": "color"
            },
            "200": {
                "value": "#C0DEEC",
                "type": "color"
            },
            "300": {
                "value": "#95C4DA",
                "type": "color"
            },
            "400": {
                "value": "#6CA9C6",
                "type": "color"
            },
            "500": {
                "value": "#4B8CAA",
                "type": "color"
            },
            "600": {
                "value": "#3F6D83",
                "type": "color"
            },
            "700": {
                "value": "#324F5D",
                "type": "color"
            },
            "800": {
                "value": "#23353D",
                "type": "color"
            },
            "900": {
                "value": "#172126",
                "type": "color"
            }
        }
    }
}