What color is #1B3648?

#1B3648 is a dark cyan-blue. In RGB it is rgb(27, 54, 72), and in HSL hsl(204, 45%, 19%).

Is #1B3648 accessible as text?

On white, #1B3648 has a contrast ratio of 12.59:1 (passes WCAG AA for body text); on black it is 1.67:1 (fails). For text placed on #1B3648, use white for the best readability.

What is the closest Tailwind color to #1B3648?

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

What colors go well with #1B3648?

#1B3648 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #462C1B. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #1B3648 below.

Is #1B3648 good for buttons?

#1B3648 works well for buttons and highlights, but use white text on #1B3648 — black text only reaches 1.67:1, below the 4.5:1 needed for normal-size labels.

Is #1B3648 the same as CSS darkslategray?

No — #1B3648 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#1B3648 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #1B3648

Not just a swatch — here's how #1B3648 works with other colors. Named schemes with #1B3648 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #1B3648 Accent #A5C4C0 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 #1B3648 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 #1B3648 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3D5667

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 #1B3648 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 #1B3648 Secondary #505A60 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 #1B3648 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 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 65/100

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 30/100

Low

A faint retro warmth without tipping into sepia.

Luxury 68/100

High

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

Brand distinctiveness 18/100

Very low

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

UI accent fit 33/100

Low

Workable accent with care around contrast.

Surface fit 50/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 89/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #1B3648

For UI

For branding

For interior

For fashion

People also use #1B3648 with

Feldgrau Navy Bistre 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 12.6:1. Use

Subtle surface Use #C8D8E3 for cards and hover fills. Tint 80

Avoid beside #1B2646 — 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 #1B3648 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: #1B3648;
  --color-base-rgb: 27 54 72;
  --color-base-oklch: oklch(32.0% 0.046 239.6);
  --color-50: #F4F8FB;
  --color-100: #E1EDF4;
  --color-200: #C4DAE8;
  --color-300: #9BBDD5;
  --color-400: #74A0BE;
  --color-500: #5382A2;
  --color-600: #45677D;
  --color-700: #354B5A;
  --color-800: #26333B;
  --color-900: #192025;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  gunmetal-gray: {
    50: '#F4F8FB',
    100: '#E1EDF4',
    200: '#C4DAE8',
    300: '#9BBDD5',
    400: '#74A0BE',
    500: '#5382A2',
    600: '#45677D',
    700: '#354B5A',
    800: '#26333B',
    900: '#192025',
  },
}

$base: #1B3648;
$base-ink: #FFFFFF;
$base-50: #F4F8FB;
$base-100: #E1EDF4;
$base-200: #C4DAE8;
$base-300: #9BBDD5;
$base-400: #74A0BE;
$base-500: #5382A2;
$base-600: #45677D;
$base-700: #354B5A;
$base-800: #26333B;
$base-900: #192025;
$base-hover: #152A38;
$base-subtle: #ACC5D6;

{
    "color": {
        "base": {
            "value": "#1B3648",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F8FB",
                "type": "color"
            },
            "100": {
                "value": "#E1EDF4",
                "type": "color"
            },
            "200": {
                "value": "#C4DAE8",
                "type": "color"
            },
            "300": {
                "value": "#9BBDD5",
                "type": "color"
            },
            "400": {
                "value": "#74A0BE",
                "type": "color"
            },
            "500": {
                "value": "#5382A2",
                "type": "color"
            },
            "600": {
                "value": "#45677D",
                "type": "color"
            },
            "700": {
                "value": "#354B5A",
                "type": "color"
            },
            "800": {
                "value": "#26333B",
                "type": "color"
            },
            "900": {
                "value": "#192025",
                "type": "color"
            }
        }
    }
}