What color is #18383D?

#18383D is a very dark cyan. In RGB it is rgb(24, 56, 61), and in HSL hsl(188, 44%, 17%).

Is #18383D accessible as text?

On white, #18383D has a contrast ratio of 12.56:1 (passes WCAG AA for body text); on black it is 1.67:1 (fails). For text placed on #18383D, use white for the best readability.

What is the closest Tailwind color to #18383D?

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

What colors go well with #18383D?

#18383D pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #3E1D18. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #18383D below.

Is #18383D good for buttons?

#18383D works well for buttons and highlights, but use white text on #18383D — black text only reaches 1.67:1, below the 4.5:1 needed for normal-size labels.

Is #18383D the same as CSS darkslategray?

No — #18383D is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#18383D Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #18383D

Not just a swatch — here's how #18383D works with other colors. Named schemes with #18383D in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #18383D Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1D3549

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 #18383D Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 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 #18383D Surface #14161A Highlight #F4F6F8 Secondary #596671 Accent #3B585C

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 #18383D Secondary #715117 Surface #E3DCC0 Accent #395143 Anchor #56233F

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 #18383D Secondary #4F5A5C Support #979286 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 #18383D 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 39/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 65/100

High

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

Naturalness 3/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 29/100

Low

A faint retro warmth without tipping into sepia.

Luxury 67/100

High

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

Brand distinctiveness 15/100

Very low

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

UI accent fit 30/100

Low

Workable accent with care around contrast.

Surface fit 53/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 90/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #18383D

For UI

For branding

For interior

For fashion

People also use #18383D with

Hunter Green Prussian Blue Bistre Platinum Dark Slate Gray

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 12.6:1. Use

Subtle surface Use #C7DFE2 for cards and hover fills. Tint 80

Avoid beside #182D3E — 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 #18383D at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #18383D;
  --color-base-rgb: 24 56 61;
  --color-base-oklch: oklch(31.9% 0.039 208.8);
  --color-50: #F4FAFB;
  --color-100: #E1F2F4;
  --color-200: #C4E3E8;
  --color-300: #9BCCD4;
  --color-400: #75B4BD;
  --color-500: #5497A1;
  --color-600: #46757C;
  --color-700: #365459;
  --color-800: #26383B;
  --color-900: #192325;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  gunmetal-gray: {
    50: '#F4FAFB',
    100: '#E1F2F4',
    200: '#C4E3E8',
    300: '#9BCCD4',
    400: '#75B4BD',
    500: '#5497A1',
    600: '#46757C',
    700: '#365459',
    800: '#26383B',
    900: '#192325',
  },
}

$base: #18383D;
$base-ink: #FFFFFF;
$base-50: #F4FAFB;
$base-100: #E1F2F4;
$base-200: #C4E3E8;
$base-300: #9BCCD4;
$base-400: #75B4BD;
$base-500: #5497A1;
$base-600: #46757C;
$base-700: #365459;
$base-800: #26383B;
$base-900: #192325;
$base-hover: #132E32;
$base-subtle: #AACFD5;

{
    "color": {
        "base": {
            "value": "#18383D",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4FAFB",
                "type": "color"
            },
            "100": {
                "value": "#E1F2F4",
                "type": "color"
            },
            "200": {
                "value": "#C4E3E8",
                "type": "color"
            },
            "300": {
                "value": "#9BCCD4",
                "type": "color"
            },
            "400": {
                "value": "#75B4BD",
                "type": "color"
            },
            "500": {
                "value": "#5497A1",
                "type": "color"
            },
            "600": {
                "value": "#46757C",
                "type": "color"
            },
            "700": {
                "value": "#365459",
                "type": "color"
            },
            "800": {
                "value": "#26383B",
                "type": "color"
            },
            "900": {
                "value": "#192325",
                "type": "color"
            }
        }
    }
}