What color is #03040B?

#03040B is a very dark low-chroma blue-gray with a subtle blue cast. In RGB it is rgb(3, 4, 11), and in HSL hsl(233, 57%, 3%).

Is #03040B accessible as text?

On white, #03040B has a contrast ratio of 20.47:1 (passes WCAG AA for body text); on black it is 1.03:1 (fails). For text placed on #03040B, use white for the best readability.

What is the closest Tailwind color to #03040B?

The nearest Tailwind CSS token is gray-950 (#030712).

What colors go well with #03040B?

As a neutral, #03040B pairs cleanly with white, off-white and light grays for text, and sits under accent hues like blue, violet, emerald or warm orange — use it as a dark surface or high-contrast base and let the accent carry the color.

Is #03040B the same as CSS black?

No — #03040B is not the CSS named color black, but black (#000000) is the closest CSS named color.

#03040B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #03040B

Not just a swatch — here's how #03040B works with other colors. Named schemes with #03040B in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #03040B Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #1A1C26

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 #03040B Secondary #7F4535 Surface #EED7C2 Accent #365247 Anchor #582239

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.

Japanese Sand Base · 5 colors

Base #03040B Surface #F2E8DD Highlight #F8F0E7 Secondary #BEACA2 Ink #2C2724

Jet Black sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Coastal Morning Lead · 5 colors

Lead #03040B 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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #03040B Secondary #202125 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.

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Color Lab

How #03040B 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 46/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 13/100

Very low

Firm and assertive — carries weight and contrast.

Depth 83/100

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 14/100

Very low

Clean and current — no dusty, aged cast.

Luxury 81/100

Very high

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

Brand distinctiveness 8/100

Very low

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

UI accent fit 3/100

Very low

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

Surface fit 72/100

High

Calm enough for large fills — backgrounds, cards, sections.

Print safety 97/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #03040B

For UI

For branding

For interior

For fashion

People also use #03040B with

Graphite Jet Black 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 20.5:1. Use

Subtle surface Use #B9BEE2 for cards and hover fills. Tint 80

Avoid beside #05030C — 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 #03040B 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: #03040B;
  --color-base-rgb: 3 4 11;
  --color-base-oklch: oklch(11.0% 0.020 273.4);
  --color-50: #F3F4FC;
  --color-100: #DEE1F7;
  --color-200: #BFC4ED;
  --color-300: #939BDC;
  --color-400: #6A75C8;
  --color-500: #4854AD;
  --color-600: #3D4684;
  --color-700: #30365E;
  --color-800: #23263E;
  --color-900: #171926;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#F3F4FC',
    100: '#DEE1F7',
    200: '#BFC4ED',
    300: '#939BDC',
    400: '#6A75C8',
    500: '#4854AD',
    600: '#3D4684',
    700: '#30365E',
    800: '#23263E',
    900: '#171926',
  },
}

$base: #03040B;
$base-ink: #FFFFFF;
$base-50: #F3F4FC;
$base-100: #DEE1F7;
$base-200: #BFC4ED;
$base-300: #939BDC;
$base-400: #6A75C8;
$base-500: #4854AD;
$base-600: #3D4684;
$base-700: #30365E;
$base-800: #23263E;
$base-900: #171926;
$base-hover: #03030A;
$base-subtle: #959CD5;

{
    "color": {
        "base": {
            "value": "#03040B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F4FC",
                "type": "color"
            },
            "100": {
                "value": "#DEE1F7",
                "type": "color"
            },
            "200": {
                "value": "#BFC4ED",
                "type": "color"
            },
            "300": {
                "value": "#939BDC",
                "type": "color"
            },
            "400": {
                "value": "#6A75C8",
                "type": "color"
            },
            "500": {
                "value": "#4854AD",
                "type": "color"
            },
            "600": {
                "value": "#3D4684",
                "type": "color"
            },
            "700": {
                "value": "#30365E",
                "type": "color"
            },
            "800": {
                "value": "#23263E",
                "type": "color"
            },
            "900": {
                "value": "#171926",
                "type": "color"
            }
        }
    }
}

Palettes built on #03040B

Color Lab

Pairs with #03040B

UI roles & guardrails

In real applications

Scales

Every model

Export