What color is #04239D?

#04239D is a dark, vivid blue. In RGB it is rgb(4, 35, 157), and in HSL hsl(228, 95%, 32%).

Is #04239D accessible as text?

On white, #04239D 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 #04239D, use white for the best readability.

What is the closest Tailwind color to #04239D?

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

What colors go well with #04239D?

#04239D pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #9F8004. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #04239D below.

Is #04239D good for buttons?

#04239D works well for buttons and highlights, but use white text on #04239D — black text only reaches 1.73:1, below the 4.5:1 needed for normal-size labels.

Is #04239D the same as CSS darkblue?

No — #04239D is not the CSS named color darkblue, but darkblue (#00008B) is the closest CSS named color.

#04239D Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #04239D

Not just a swatch — here's how #04239D works with other colors. Named schemes with #04239D in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #04239D Anchor #141210 Accent #ACAE53 Secondary #242933 Surface #F0EEE3

Zaffre carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Tech Product Signal · 5 colors

Signal #04239D Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #2650BB

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

Moody Editorial Color · 5 colors

Color #04239D Anchor #2A2A2E Secondary #6E6E74 Surface #E9E7DA Accent #1B0059

Zaffre adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from Zaffre.

Coastal Morning Lead · 5 colors

Lead #04239D Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #04239D Secondary #4D6087 Support #9D8F88 Ink #18140F

Zaffre 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 Zaffre carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #04239D 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 9/100

Cool

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

Softness 23/100

Low

Firm and assertive — carries weight and contrast.

Depth 70/100

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 19/100

Very low

Clean and current — no dusty, aged cast.

Luxury 64/100

High

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

Brand distinctiveness 75/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 50/100

Moderate

Workable accent with care around contrast.

Surface fit 17/100

Very low

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

Print safety 64/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #04239D

For UI

For branding

For interior

For fashion

People also use #04239D with

Bondi Blue Indigo Olive Brown Gainsboro Gunmetal 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 12.1:1. Use

Subtle surface Use #C5CEF4 for cards and hover fills. Tint 80

Avoid beside #19049F — 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 #04239D 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: #04239D;
  --color-base-rgb: 4 35 157;
  --color-base-oklch: oklch(34.9% 0.195 264.5);
  --color-50: #F0F3FE;
  --color-100: #D8DFFD;
  --color-200: #B1C0FC;
  --color-300: #7A93F5;
  --color-400: #4A6AE8;
  --color-500: #2748CE;
  --color-600: #263D9C;
  --color-700: #21306E;
  --color-800: #1A2347;
  --color-900: #12172B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  zaffre: {
    50: '#F0F3FE',
    100: '#D8DFFD',
    200: '#B1C0FC',
    300: '#7A93F5',
    400: '#4A6AE8',
    500: '#2748CE',
    600: '#263D9C',
    700: '#21306E',
    800: '#1A2347',
    900: '#12172B',
  },
}

$base: #04239D;
$base-ink: #FFFFFF;
$base-50: #F0F3FE;
$base-100: #D8DFFD;
$base-200: #B1C0FC;
$base-300: #7A93F5;
$base-400: #4A6AE8;
$base-500: #2748CE;
$base-600: #263D9C;
$base-700: #21306E;
$base-800: #1A2347;
$base-900: #12172B;
$base-hover: #031C7F;
$base-subtle: #A5B4F1;

{
    "color": {
        "base": {
            "value": "#04239D",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F3FE",
                "type": "color"
            },
            "100": {
                "value": "#D8DFFD",
                "type": "color"
            },
            "200": {
                "value": "#B1C0FC",
                "type": "color"
            },
            "300": {
                "value": "#7A93F5",
                "type": "color"
            },
            "400": {
                "value": "#4A6AE8",
                "type": "color"
            },
            "500": {
                "value": "#2748CE",
                "type": "color"
            },
            "600": {
                "value": "#263D9C",
                "type": "color"
            },
            "700": {
                "value": "#21306E",
                "type": "color"
            },
            "800": {
                "value": "#1A2347",
                "type": "color"
            },
            "900": {
                "value": "#12172B",
                "type": "color"
            }
        }
    }
}

Palettes built on #04239D

Color Lab

Pairs with #04239D

UI roles & guardrails

In real applications

Scales

Every model

Export