What color is #1D3B4E?

#1D3B4E is a dark cyan-blue. In RGB it is rgb(29, 59, 78), and in HSL hsl(203, 46%, 21%).

Is #1D3B4E accessible as text?

On white, #1D3B4E has a contrast ratio of 11.75:1 (passes WCAG AA for body text); on black it is 1.79:1 (fails). For text placed on #1D3B4E, use white for the best readability.

What is the closest Tailwind color to #1D3B4E?

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

What colors go well with #1D3B4E?

#1D3B4E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4E301D. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #1D3B4E below.

Is #1D3B4E good for buttons?

#1D3B4E works well for buttons and highlights, but use white text on #1D3B4E — black text only reaches 1.79:1, below the 4.5:1 needed for normal-size labels.

Is #1D3B4E the same as CSS darkslategray?

No — #1D3B4E is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#1D3B4E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1D3B4E

Not just a swatch — here's how #1D3B4E works with other colors. Named schemes with #1D3B4E in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #1D3B4E Accent #A6C4C0 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 #1D3B4E Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 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 #1D3B4E Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #405B6E

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 #1D3B4E Secondary #7F4439 Surface #E2DDC0 Accent #385245 Anchor #57233C

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 #1D3B4E Secondary #545F66 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 #1D3B4E 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 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 32/100

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 19/100

Very low

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

UI accent fit 38/100

Low

Workable accent with care around contrast.

Surface fit 48/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 88/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #1D3B4E

For UI

For branding

For interior

For fashion

People also use #1D3B4E 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 11.7:1. Use

Subtle surface Use #C9DAE4 for cards and hover fills. Tint 80

Avoid beside #1D2B4E — 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 #1D3B4E 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: #1D3B4E;
  --color-base-rgb: 29 59 78;
  --color-base-oklch: oklch(33.8% 0.049 238.3);
  --color-50: #F3F8FB;
  --color-100: #E1EDF5;
  --color-200: #C4DBE9;
  --color-300: #9ABFD5;
  --color-400: #73A2BF;
  --color-500: #5284A3;
  --color-600: #44687E;
  --color-700: #354C5A;
  --color-800: #25333C;
  --color-900: #182025;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  gunmetal-gray: {
    50: '#F3F8FB',
    100: '#E1EDF5',
    200: '#C4DBE9',
    300: '#9ABFD5',
    400: '#73A2BF',
    500: '#5284A3',
    600: '#44687E',
    700: '#354C5A',
    800: '#25333C',
    900: '#182025',
  },
}

$base: #1D3B4E;
$base-ink: #FFFFFF;
$base-50: #F3F8FB;
$base-100: #E1EDF5;
$base-200: #C4DBE9;
$base-300: #9ABFD5;
$base-400: #73A2BF;
$base-500: #5284A3;
$base-600: #44687E;
$base-700: #354C5A;
$base-800: #25333C;
$base-900: #182025;
$base-hover: #172F3F;
$base-subtle: #ADC7D8;

{
    "color": {
        "base": {
            "value": "#1D3B4E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F8FB",
                "type": "color"
            },
            "100": {
                "value": "#E1EDF5",
                "type": "color"
            },
            "200": {
                "value": "#C4DBE9",
                "type": "color"
            },
            "300": {
                "value": "#9ABFD5",
                "type": "color"
            },
            "400": {
                "value": "#73A2BF",
                "type": "color"
            },
            "500": {
                "value": "#5284A3",
                "type": "color"
            },
            "600": {
                "value": "#44687E",
                "type": "color"
            },
            "700": {
                "value": "#354C5A",
                "type": "color"
            },
            "800": {
                "value": "#25333C",
                "type": "color"
            },
            "900": {
                "value": "#182025",
                "type": "color"
            }
        }
    }
}