What color is #040B03?

#040B03 is a very dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(4, 11, 3), and in HSL hsl(113, 57%, 3%).

Is #040B03 accessible as text?

On white, #040B03 has a contrast ratio of 19.92:1 (passes WCAG AA for body text); on black it is 1.05:1 (fails). For text placed on #040B03, use white for the best readability.

What is the closest Tailwind color to #040B03?

The nearest Tailwind CSS token is neutral-950 (#0A0A0A).

What colors go well with #040B03?

As a neutral, #040B03 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 #040B03 the same as CSS black?

No — #040B03 is not the CSS named color black, but black (#000000) is the closest CSS named color.

#040B03 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #040B03

Not just a swatch — here's how #040B03 works with other colors. Named schemes with #040B03 in its natural role, and a note on why the supporting colors balance it.

Botanical Studio Lead · 5 colors

Lead #040B03 Secondary #4D6B3B Accent #AE6B00 Surface #EFEAD6 Anchor #3C2F21

Jet Black leads this botanical set among foliage greens and a terracotta accent, softened by cream and grounded in bark brown.

Vintage Leather Lead · 5 colors

Lead #040B03 Secondary #754E1C Surface #E6DBC0 Accent #3D513F Anchor #5B2322

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 #040B03 Surface #EEE9DC Highlight #F5F1E7 Secondary #B7B09F Ink #2B2723

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.

Luxury Packaging Feature · 5 colors

Feature #040B03 Anchor #141210 Accent #C1A64B Secondary #242B22 Surface #F1EDE3

Jet Black 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.

Minimal Editorial Surface · 5 colors

Surface #F7F4EF Accent #040B03 Secondary #262925 Support #989286 Ink #17140F

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 #040B03 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 50/100

Neutral

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

Softness 16/100

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 41/100

Moderate

Loosely natural — an earthy edge without being rustic.

Vintage feel 20/100

Low

Clean and current — no dusty, aged cast.

Luxury 80/100

High

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

Brand distinctiveness 10/100

Very low

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

UI accent fit 4/100

Very low

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

Surface fit 68/100

High

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

Print safety 94/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #040B03

For UI

For branding

For interior

For fashion

People also use #040B03 with

Sacramento Green Jet Black Platinum Hunter Green

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 19.9:1. Use

Subtle surface Use #BEE2B9 for cards and hover fills. Tint 80

Avoid beside #030C05 — 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 #040B03 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: #040B03;
  --color-base-rgb: 4 11 3;
  --color-base-oklch: oklch(13.7% 0.026 140.1);
  --color-50: #F4FCF3;
  --color-100: #E1F7DE;
  --color-200: #C4EDBF;
  --color-300: #9BDC93;
  --color-400: #75C86A;
  --color-500: #54AD48;
  --color-600: #46843D;
  --color-700: #365E30;
  --color-800: #263E23;
  --color-900: #192617;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#F4FCF3',
    100: '#E1F7DE',
    200: '#C4EDBF',
    300: '#9BDC93',
    400: '#75C86A',
    500: '#54AD48',
    600: '#46843D',
    700: '#365E30',
    800: '#263E23',
    900: '#192617',
  },
}

$base: #040B03;
$base-ink: #FFFFFF;
$base-50: #F4FCF3;
$base-100: #E1F7DE;
$base-200: #C4EDBF;
$base-300: #9BDC93;
$base-400: #75C86A;
$base-500: #54AD48;
$base-600: #46843D;
$base-700: #365E30;
$base-800: #263E23;
$base-900: #192617;
$base-hover: #030A03;
$base-subtle: #9CD595;

{
    "color": {
        "base": {
            "value": "#040B03",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4FCF3",
                "type": "color"
            },
            "100": {
                "value": "#E1F7DE",
                "type": "color"
            },
            "200": {
                "value": "#C4EDBF",
                "type": "color"
            },
            "300": {
                "value": "#9BDC93",
                "type": "color"
            },
            "400": {
                "value": "#75C86A",
                "type": "color"
            },
            "500": {
                "value": "#54AD48",
                "type": "color"
            },
            "600": {
                "value": "#46843D",
                "type": "color"
            },
            "700": {
                "value": "#365E30",
                "type": "color"
            },
            "800": {
                "value": "#263E23",
                "type": "color"
            },
            "900": {
                "value": "#192617",
                "type": "color"
            }
        }
    }
}

Palettes built on #040B03

Color Lab

Pairs with #040B03

UI roles & guardrails

In real applications

Scales

Every model

Export