What color is #040243?

#040243 is a very dark, vivid blue. In RGB it is rgb(4, 2, 67), and in HSL hsl(242, 94%, 14%).

Is #040243 accessible as text?

On white, #040243 has a contrast ratio of 19.18:1 (passes WCAG AA for body text); on black it is 1.09:1 (fails). For text placed on #040243, use white for the best readability.

What is the closest Tailwind color to #040243?

The nearest Tailwind CSS token is indigo-950 (#1E1A4D).

What colors go well with #040243?

#040243 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #434502. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #040243 below.

Is #040243 good for buttons?

#040243 works well for buttons and highlights, but use white text on #040243 — black text only reaches 1.09:1, below the 4.5:1 needed for normal-size labels.

Is #040243 the same as CSS midnightblue?

No — #040243 is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color.

#040243 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #040243

Not just a swatch — here's how #040243 works with other colors. Named schemes with #040243 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #040243 Anchor #141210 Accent #DC9659 Secondary #252933 Surface #F4ECE3

Navy 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.

Moody Editorial Color · 5 colors

Color #040243 Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #020013

Navy 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 Navy.

Coastal Morning Lead · 5 colors

Lead #040243 Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

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

Vintage Leather Lead · 5 colors

Lead #040243 Secondary #7F4535 Surface #EED7C2 Accent #365246 Anchor #58223A

Navy 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 #F8F4EF Accent #040243 Secondary #2A3248 Support #9D8F88 Ink #18140F

Navy 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 Navy carrying the quiet middle.

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Color Lab

How #040243 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 23/100

Cool

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

Softness 16/100

Very low

Firm and assertive — carries weight and contrast.

Depth 82/100

Very 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 25/100

Low

Clean and current — no dusty, aged cast.

Luxury 85/100

Very 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 12/100

Very low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 38/100

Low

Usable as a tinted surface in measured doses.

Print safety 80/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #040243

For UI

For branding

For interior

For fashion

People also use #040243 with

Yale Blue Deep Purple Espresso Gainsboro Prussian Blue

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 19.2:1. Use

Subtle surface Use #B7B5F1 for cards and hover fills. Tint 80

Avoid beside #1B0245 — 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 #040243 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: #040243;
  --color-base-rgb: 4 2 67;
  --color-base-oklch: oklch(18.1% 0.115 268.4);
  --color-50: #F1F0FE;
  --color-100: #D9D8FD;
  --color-200: #B3B1FC;
  --color-300: #7F7BF4;
  --color-400: #504BE7;
  --color-500: #2D28CD;
  --color-600: #2A269B;
  --color-700: #24216D;
  --color-800: #1B1A47;
  --color-900: #13122B;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  navy: {
    50: '#F1F0FE',
    100: '#D9D8FD',
    200: '#B3B1FC',
    300: '#7F7BF4',
    400: '#504BE7',
    500: '#2D28CD',
    600: '#2A269B',
    700: '#24216D',
    800: '#1B1A47',
    900: '#13122B',
  },
}

$base: #040243;
$base-ink: #FFFFFF;
$base-50: #F1F0FE;
$base-100: #D9D8FD;
$base-200: #B3B1FC;
$base-300: #7F7BF4;
$base-400: #504BE7;
$base-500: #2D28CD;
$base-600: #2A269B;
$base-700: #24216D;
$base-800: #1B1A47;
$base-900: #13122B;
$base-hover: #040237;
$base-subtle: #918EEC;

{
    "color": {
        "base": {
            "value": "#040243",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F0FE",
                "type": "color"
            },
            "100": {
                "value": "#D9D8FD",
                "type": "color"
            },
            "200": {
                "value": "#B3B1FC",
                "type": "color"
            },
            "300": {
                "value": "#7F7BF4",
                "type": "color"
            },
            "400": {
                "value": "#504BE7",
                "type": "color"
            },
            "500": {
                "value": "#2D28CD",
                "type": "color"
            },
            "600": {
                "value": "#2A269B",
                "type": "color"
            },
            "700": {
                "value": "#24216D",
                "type": "color"
            },
            "800": {
                "value": "#1B1A47",
                "type": "color"
            },
            "900": {
                "value": "#13122B",
                "type": "color"
            }
        }
    }
}

Palettes built on #040243

Color Lab

Pairs with #040243

UI roles & guardrails

In real applications

Scales

Every model

Export