What color is #0D3A4E?

#0D3A4E is a dark, vivid cyan-blue. In RGB it is rgb(13, 58, 78), and in HSL hsl(198, 71%, 18%).

Is #0D3A4E accessible as text?

On white, #0D3A4E has a contrast ratio of 12.12:1 (passes WCAG AA for body text); on black it is 1.73:1 (fails). For text placed on #0D3A4E, use white for the best readability.

What is the closest Tailwind color to #0D3A4E?

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

What colors go well with #0D3A4E?

#0D3A4E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4E210D. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #0D3A4E below.

Is #0D3A4E good for buttons?

#0D3A4E works well for buttons and highlights, but use white text on #0D3A4E — black text only reaches 1.73:1, below the 4.5:1 needed for normal-size labels.

Is #0D3A4E the same as CSS darkslategray?

No — #0D3A4E is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#0D3A4E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #0D3A4E

Not just a swatch — here's how #0D3A4E works with other colors. Named schemes with #0D3A4E in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #0D3A4E Accent #A6C4C0 Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

Prussian Blue 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 #0D3A4E Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 Anchor #2E3236

Prussian Blue 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 #0D3A4E Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #355A6D

Prussian Blue is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Prussian Blue.

Vintage Leather Lead · 5 colors

Lead #0D3A4E Secondary #6F5216 Surface #E2DCC0 Accent #385244 Anchor #56233D

Prussian Blue 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 #0D3A4E Secondary #4F5D64 Support #969386 Ink #16140F

Prussian Blue 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 Prussian Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #0D3A4E 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 33/100

Cool

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

Softness 32/100

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 34/100

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 23/100

Low

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

UI accent fit 38/100

Low

Workable accent with care around contrast.

Surface fit 46/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 85/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #0D3A4E

For UI

For branding

For interior

For fashion

People also use #0D3A4E with

Pine Green 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 12.1:1. Use

Subtle surface Use #C0DEEB for cards and hover fills. Tint 80

Avoid beside #0D254E — 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 #0D3A4E 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: #0D3A4E;
  --color-base-rgb: 13 58 78;
  --color-base-oklch: oklch(32.9% 0.059 232.1);
  --color-50: #F1FAFD;
  --color-100: #DBF1FA;
  --color-200: #B9E2F3;
  --color-300: #8ACAE5;
  --color-400: #5EB1D4;
  --color-500: #3C93B9;
  --color-600: #35738D;
  --color-700: #2B5364;
  --color-800: #1F3742;
  --color-900: #152228;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  prussian-blue: {
    50: '#F1FAFD',
    100: '#DBF1FA',
    200: '#B9E2F3',
    300: '#8ACAE5',
    400: '#5EB1D4',
    500: '#3C93B9',
    600: '#35738D',
    700: '#2B5364',
    800: '#1F3742',
    900: '#152228',
  },
}

$base: #0D3A4E;
$base-ink: #FFFFFF;
$base-50: #F1FAFD;
$base-100: #DBF1FA;
$base-200: #B9E2F3;
$base-300: #8ACAE5;
$base-400: #5EB1D4;
$base-500: #3C93B9;
$base-600: #35738D;
$base-700: #2B5364;
$base-800: #1F3742;
$base-900: #152228;
$base-hover: #0B2F3F;
$base-subtle: #9ECEE2;

{
    "color": {
        "base": {
            "value": "#0D3A4E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1FAFD",
                "type": "color"
            },
            "100": {
                "value": "#DBF1FA",
                "type": "color"
            },
            "200": {
                "value": "#B9E2F3",
                "type": "color"
            },
            "300": {
                "value": "#8ACAE5",
                "type": "color"
            },
            "400": {
                "value": "#5EB1D4",
                "type": "color"
            },
            "500": {
                "value": "#3C93B9",
                "type": "color"
            },
            "600": {
                "value": "#35738D",
                "type": "color"
            },
            "700": {
                "value": "#2B5364",
                "type": "color"
            },
            "800": {
                "value": "#1F3742",
                "type": "color"
            },
            "900": {
                "value": "#152228",
                "type": "color"
            }
        }
    }
}