What color is #040A2A?

#040A2A is a very dark, vivid blue. In RGB it is rgb(4, 10, 42), and in HSL hsl(231, 83%, 9%).

Is #040A2A accessible as text?

On white, #040A2A has a contrast ratio of 19.41:1 (passes WCAG AA for body text); on black it is 1.08:1 (fails). For text placed on #040A2A, use white for the best readability.

What is the closest Tailwind color to #040A2A?

The nearest Tailwind CSS token is mauve-950 (#0C090C).

What colors go well with #040A2A?

#040A2A pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #2A2404. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #040A2A below.

Is #040A2A good for buttons?

#040A2A works well for buttons and highlights, but use white text on #040A2A — black text only reaches 1.08:1, below the 4.5:1 needed for normal-size labels.

Is #040A2A the same as CSS midnightblue?

No — #040A2A is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#040A2A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #040A2A

Not just a swatch — here's how #040A2A works with other colors. Named schemes with #040A2A in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #040A2A Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Jet Black 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 #040A2A Secondary #AEB4B8 Surface #F1F2F0 Support #7D92A7 Anchor #2E3236

Jet Black 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 #040A2A Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #1D2847

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

Vintage Leather Lead · 5 colors

Lead #040A2A Secondary #7F4535 Surface #EED7C2 Accent #365246 Anchor #58223A

Jet Black 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 #040A2A Secondary #2A2F3B Support #9D8F88 Ink #18140F

Jet Black 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 Jet Black carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #040A2A 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 35/100

Cool

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

Softness 17/100

Very low

Firm and assertive — carries weight and contrast.

Depth 81/100

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 24/100

Low

Clean and current — no dusty, aged cast.

Luxury 82/100

Very 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 8/100

Very low

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

Surface fit 54/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 88/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #040A2A

For UI

For branding

For interior

For fashion

People also use #040A2A with

Prussian Blue Jet Black Graphite Gainsboro

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 19.4:1. Use

Subtle surface Use #B5BDEC for cards and hover fills. Tint 80

Avoid beside #0B042A — 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 #040A2A at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #040A2A;
  --color-base-rgb: 4 10 42;
  --color-base-oklch: oklch(16.4% 0.066 267.9);
  --color-50: #F0F2FE;
  --color-100: #D9DEFD;
  --color-200: #B4BFF8;
  --color-300: #8292ED;
  --color-400: #5469DE;
  --color-500: #3147C3;
  --color-600: #2D3D95;
  --color-700: #263069;
  --color-800: #1C2244;
  --color-900: #13172A;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#F0F2FE',
    100: '#D9DEFD',
    200: '#B4BFF8',
    300: '#8292ED',
    400: '#5469DE',
    500: '#3147C3',
    600: '#2D3D95',
    700: '#263069',
    800: '#1C2244',
    900: '#13172A',
  },
}

$base: #040A2A;
$base-ink: #FFFFFF;
$base-50: #F0F2FE;
$base-100: #D9DEFD;
$base-200: #B4BFF8;
$base-300: #8292ED;
$base-400: #5469DE;
$base-500: #3147C3;
$base-600: #2D3D95;
$base-700: #263069;
$base-800: #1C2244;
$base-900: #13172A;
$base-hover: #030822;
$base-subtle: #8D9BE5;

{
    "color": {
        "base": {
            "value": "#040A2A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F0F2FE",
                "type": "color"
            },
            "100": {
                "value": "#D9DEFD",
                "type": "color"
            },
            "200": {
                "value": "#B4BFF8",
                "type": "color"
            },
            "300": {
                "value": "#8292ED",
                "type": "color"
            },
            "400": {
                "value": "#5469DE",
                "type": "color"
            },
            "500": {
                "value": "#3147C3",
                "type": "color"
            },
            "600": {
                "value": "#2D3D95",
                "type": "color"
            },
            "700": {
                "value": "#263069",
                "type": "color"
            },
            "800": {
                "value": "#1C2244",
                "type": "color"
            },
            "900": {
                "value": "#13172A",
                "type": "color"
            }
        }
    }
}

Palettes built on #040A2A

Color Lab

Pairs with #040A2A

UI roles & guardrails

In real applications

Scales

Every model

Export