What color is #034C56?

#034C56 is a very dark, vivid cyan. In RGB it is rgb(3, 76, 86), and in HSL hsl(187, 93%, 17%).

Is #034C56 accessible as text?

On white, #034C56 has a contrast ratio of 9.67:1 (passes WCAG AA for body text); on black it is 2.17:1 (fails). For text placed on #034C56, use white for the best readability.

What is the closest Tailwind color to #034C56?

The nearest Tailwind CSS token is cyan-900 (#104E64).

What colors go well with #034C56?

#034C56 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #540C03. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #034C56 below.

Is #034C56 good for buttons?

#034C56 works well for buttons and highlights, but use white text on #034C56 — black text only reaches 2.17:1, below the 4.5:1 needed for normal-size labels.

Is #034C56 the same as CSS darkslategray?

No — #034C56 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#034C56 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #034C56

Not just a swatch — here's how #034C56 works with other colors. Named schemes with #034C56 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #034C56 Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1D3549

Dark Slate 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 #034C56 Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 Anchor #2E3236

Dark Slate 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 #034C56 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #386D76

Dark Slate 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 Dark Slate Gray.

Vintage Leather Lead · 5 colors

Lead #034C56 Secondary #705117 Surface #E3DCC0 Accent #395143 Anchor #56233F

Dark Slate 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 #034C56 Secondary #5B6D71 Support #979286 Ink #16140F

Dark Slate 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 Dark Slate Gray carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #034C56 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 32/100

Cool

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

Softness 37/100

Low

Middle-weight — neither delicate nor heavy.

Depth 60/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 4/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 40/100

Low

A faint retro warmth without tipping into sepia.

Luxury 64/100

High

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

Brand distinctiveness 25/100

Low

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

UI accent fit 54/100

Moderate

Workable accent with care around contrast.

Surface fit 40/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 83/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #034C56

For UI

For branding

For interior

For fashion

People also use #034C56 with

Fern 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 9.7:1. Use

Subtle surface Use #B8EAF1 for cards and hover fills. Tint 80

Avoid beside #032F54 — 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 #034C56 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: #034C56;
  --color-base-rgb: 3 76 86;
  --color-base-oklch: oklch(38.2% 0.065 210.1);
  --color-50: #F0FDFE;
  --color-100: #D8F9FD;
  --color-200: #B1F3FC;
  --color-300: #7CE6F4;
  --color-400: #4CD4E6;
  --color-500: #29B9CC;
  --color-600: #278D9B;
  --color-700: #22646D;
  --color-800: #1A4247;
  --color-900: #12282B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-gray: {
    50: '#F0FDFE',
    100: '#D8F9FD',
    200: '#B1F3FC',
    300: '#7CE6F4',
    400: '#4CD4E6',
    500: '#29B9CC',
    600: '#278D9B',
    700: '#22646D',
    800: '#1A4247',
    900: '#12282B',
  },
}

$base: #034C56;
$base-ink: #FFFFFF;
$base-50: #F0FDFE;
$base-100: #D8F9FD;
$base-200: #B1F3FC;
$base-300: #7CE6F4;
$base-400: #4CD4E6;
$base-500: #29B9CC;
$base-600: #278D9B;
$base-700: #22646D;
$base-800: #1A4247;
$base-900: #12282B;
$base-hover: #023B43;
$base-subtle: #93E2EC;

{
    "color": {
        "base": {
            "value": "#034C56",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0FDFE",
                "type": "color"
            },
            "100": {
                "value": "#D8F9FD",
                "type": "color"
            },
            "200": {
                "value": "#B1F3FC",
                "type": "color"
            },
            "300": {
                "value": "#7CE6F4",
                "type": "color"
            },
            "400": {
                "value": "#4CD4E6",
                "type": "color"
            },
            "500": {
                "value": "#29B9CC",
                "type": "color"
            },
            "600": {
                "value": "#278D9B",
                "type": "color"
            },
            "700": {
                "value": "#22646D",
                "type": "color"
            },
            "800": {
                "value": "#1A4247",
                "type": "color"
            },
            "900": {
                "value": "#12282B",
                "type": "color"
            }
        }
    }
}

Palettes built on #034C56

Color Lab

Pairs with #034C56

UI roles & guardrails

In real applications

Scales

Every model

Export