What color is #133D43?

#133D43 is a very dark cyan. In RGB it is rgb(19, 61, 67), and in HSL hsl(188, 56%, 17%).

Is #133D43 accessible as text?

On white, #133D43 has a contrast ratio of 11.82:1 (passes WCAG AA for body text); on black it is 1.78:1 (fails). For text placed on #133D43, use white for the best readability.

What is the closest Tailwind color to #133D43?

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

What colors go well with #133D43?

#133D43 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #441A13. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #133D43 below.

Is #133D43 good for buttons?

#133D43 works well for buttons and highlights, but use white text on #133D43 — black text only reaches 1.78:1, below the 4.5:1 needed for normal-size labels.

Is #133D43 the same as CSS darkslategray?

No — #133D43 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#133D43 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #133D43

Not just a swatch — here's how #133D43 works with other colors. Named schemes with #133D43 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #133D43 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 #133D43 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 #133D43 Surface #14161A Highlight #F4F6F8 Secondary #596671 Accent #395D63

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 #133D43 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 #133D43 Secondary #525F61 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 #133D43 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 37/100

Cool

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

Softness 34/100

Low

Middle-weight — neither delicate nor heavy.

Depth 64/100

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 32/100

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 18/100

Very low

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

UI accent fit 36/100

Low

Workable accent with care around contrast.

Surface fit 49/100

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 #133D43

For UI

For branding

For interior

For fashion

People also use #133D43 with

Hunter Green Navy Oxblood 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 11.8:1. Use

Subtle surface Use #C4E1E6 for cards and hover fills. Tint 80

Avoid beside #132D44 — 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 #133D43 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: #133D43;
  --color-base-rgb: 19 61 67;
  --color-base-oklch: oklch(33.4% 0.047 208.3);
  --color-50: #F3FBFC;
  --color-100: #DFF3F7;
  --color-200: #BFE7ED;
  --color-300: #93D2DC;
  --color-400: #6BBBC7;
  --color-500: #499FAC;
  --color-600: #3E7A84;
  --color-700: #31585E;
  --color-800: #233A3E;
  --color-900: #172426;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  gunmetal-gray: {
    50: '#F3FBFC',
    100: '#DFF3F7',
    200: '#BFE7ED',
    300: '#93D2DC',
    400: '#6BBBC7',
    500: '#499FAC',
    600: '#3E7A84',
    700: '#31585E',
    800: '#233A3E',
    900: '#172426',
  },
}

$base: #133D43;
$base-ink: #FFFFFF;
$base-50: #F3FBFC;
$base-100: #DFF3F7;
$base-200: #BFE7ED;
$base-300: #93D2DC;
$base-400: #6BBBC7;
$base-500: #499FAC;
$base-600: #3E7A84;
$base-700: #31585E;
$base-800: #233A3E;
$base-900: #172426;
$base-hover: #0F3136;
$base-subtle: #A4D3DB;

{
    "color": {
        "base": {
            "value": "#133D43",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3FBFC",
                "type": "color"
            },
            "100": {
                "value": "#DFF3F7",
                "type": "color"
            },
            "200": {
                "value": "#BFE7ED",
                "type": "color"
            },
            "300": {
                "value": "#93D2DC",
                "type": "color"
            },
            "400": {
                "value": "#6BBBC7",
                "type": "color"
            },
            "500": {
                "value": "#499FAC",
                "type": "color"
            },
            "600": {
                "value": "#3E7A84",
                "type": "color"
            },
            "700": {
                "value": "#31585E",
                "type": "color"
            },
            "800": {
                "value": "#233A3E",
                "type": "color"
            },
            "900": {
                "value": "#172426",
                "type": "color"
            }
        }
    }
}