What color is #05409F?

#05409F is a dark, vivid blue. In RGB it is rgb(5, 64, 159), and in HSL hsl(217, 94%, 32%).

Is #05409F accessible as text?

On white, #05409F has a contrast ratio of 9.37:1 (passes WCAG AA for body text); on black it is 2.24:1 (fails). For text placed on #05409F, use white for the best readability.

What is the closest Tailwind color to #05409F?

The nearest Tailwind CSS token is blue-900 (#1C398E).

What colors go well with #05409F?

#05409F pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #9E6305. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #05409F below.

Is #05409F good for buttons?

#05409F works well for buttons and highlights, but use white text on #05409F — black text only reaches 2.24:1, below the 4.5:1 needed for normal-size labels.

Is #05409F the same as CSS darkslateblue?

No — #05409F is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#05409F Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #05409F

Not just a swatch — here's how #05409F works with other colors. Named schemes with #05409F in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #05409F Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Cobalt Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Tech Product Signal · 5 colors

Signal #05409F Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #3466BE

Cobalt 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 Cobalt Blue.

Vintage Leather Lead · 5 colors

Lead #05409F Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

Cobalt 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.

Berry & Cream Lead · 5 colors

Lead #05409F Surface #F6E5D8 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

Cobalt Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #05409F Secondary #5D7092 Support #9D8F88 Ink #18140F

Cobalt 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 Cobalt Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #05409F 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 8/100

Cool

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

Softness 29/100

Low

Firm and assertive — carries weight and contrast.

Depth 62/100

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 29/100

Low

A faint retro warmth without tipping into sepia.

Luxury 62/100

High

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

Brand distinctiveness 44/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 74/100

High

Strong interactive accent — visible and can carry a legible label.

Surface fit 14/100

Very low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 68/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #05409F

For UI

For branding

For interior

For fashion

People also use #05409F with

Tiffany Blue Zaffre Raw Umber Gainsboro 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 9.4:1. Use

Subtle surface Use #C5D7F4 for cards and hover fills. Tint 80

Avoid beside #050D9E — 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 #05409F 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: #05409F;
  --color-base-rgb: 5 64 159;
  --color-base-oklch: oklch(40.4% 0.164 260.6);
  --color-50: #F0F6FE;
  --color-100: #D8E6FD;
  --color-200: #B1CDFC;
  --color-300: #7BA9F4;
  --color-400: #4B87E7;
  --color-500: #2867CD;
  --color-600: #26539B;
  --color-700: #213F6D;
  --color-800: #1A2B47;
  --color-900: #121C2B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cobalt-blue: {
    50: '#F0F6FE',
    100: '#D8E6FD',
    200: '#B1CDFC',
    300: '#7BA9F4',
    400: '#4B87E7',
    500: '#2867CD',
    600: '#26539B',
    700: '#213F6D',
    800: '#1A2B47',
    900: '#121C2B',
  },
}

$base: #05409F;
$base-ink: #FFFFFF;
$base-50: #F0F6FE;
$base-100: #D8E6FD;
$base-200: #B1CDFC;
$base-300: #7BA9F4;
$base-400: #4B87E7;
$base-500: #2867CD;
$base-600: #26539B;
$base-700: #213F6D;
$base-800: #1A2B47;
$base-900: #121C2B;
$base-hover: #04337F;
$base-subtle: #A6C2F0;

{
    "color": {
        "base": {
            "value": "#05409F",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F6FE",
                "type": "color"
            },
            "100": {
                "value": "#D8E6FD",
                "type": "color"
            },
            "200": {
                "value": "#B1CDFC",
                "type": "color"
            },
            "300": {
                "value": "#7BA9F4",
                "type": "color"
            },
            "400": {
                "value": "#4B87E7",
                "type": "color"
            },
            "500": {
                "value": "#2867CD",
                "type": "color"
            },
            "600": {
                "value": "#26539B",
                "type": "color"
            },
            "700": {
                "value": "#213F6D",
                "type": "color"
            },
            "800": {
                "value": "#1A2B47",
                "type": "color"
            },
            "900": {
                "value": "#121C2B",
                "type": "color"
            }
        }
    }
}

Palettes built on #05409F

Color Lab

Pairs with #05409F

UI roles & guardrails

In real applications

Scales

Every model

Export