What color is #040B0A?

#040B0A is a very dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(4, 11, 10), and in HSL hsl(171, 47%, 3%).

Is #040B0A accessible as text?

On white, #040B0A has a contrast ratio of 19.86:1 (passes WCAG AA for body text); on black it is 1.06:1 (fails). For text placed on #040B0A, use white for the best readability.

What is the closest Tailwind color to #040B0A?

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

What colors go well with #040B0A?

As a neutral, #040B0A 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 #040B0A the same as CSS black?

No — #040B0A is not the CSS named color black, but black (#000000) is the closest CSS named color.

#040B0A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #040B0A

Not just a swatch — here's how #040B0A works with other colors. Named schemes with #040B0A in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #040B0A Surface #14161A Highlight #F4F6F8 Secondary #586771 Accent #1E2625

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 #040B0A Secondary #725018 Surface #E4DCC0 Accent #3A5142 Anchor #5B241D

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 #040B0A Surface #EDEADC Highlight #F5F2E7 Secondary #B5B19F Ink #2A2723

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 #040B0A Anchor #141210 Accent #BAA94D Secondary #1E2C2A 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 #040B0A Secondary #262A29 Support #979286 Ink #16140F

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 #040B0A 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 47/100

Neutral

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

Softness 17/100

Very low

Firm and assertive — carries weight and contrast.

Depth 80/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 7/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 15/100

Very low

Clean and current — no dusty, aged cast.

Luxury 78/100

High

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

Brand distinctiveness 5/100

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 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 #040B0A

For UI

For branding

For interior

For fashion

People also use #040B0A with

Sacramento Green Jet Black Platinum Dark Slate 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 19.9:1. Use

Subtle surface Use #BDDED9 for cards and hover fills. Tint 80

Avoid beside #040A0B — 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 #040B0A 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: #040B0A;
  --color-base-rgb: 4 11 10;
  --color-base-oklch: oklch(14.0% 0.013 186.5);
  --color-50: #F3FBFA;
  --color-100: #E0F5F2;
  --color-200: #C3E9E4;
  --color-300: #99D6CD;
  --color-400: #72C0B4;
  --color-500: #51A497;
  --color-600: #447E75;
  --color-700: #345A55;
  --color-800: #253C38;
  --color-900: #182523;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#F3FBFA',
    100: '#E0F5F2',
    200: '#C3E9E4',
    300: '#99D6CD',
    400: '#72C0B4',
    500: '#51A497',
    600: '#447E75',
    700: '#345A55',
    800: '#253C38',
    900: '#182523',
  },
}

$base: #040B0A;
$base-ink: #FFFFFF;
$base-50: #F3FBFA;
$base-100: #E0F5F2;
$base-200: #C3E9E4;
$base-300: #99D6CD;
$base-400: #72C0B4;
$base-500: #51A497;
$base-600: #447E75;
$base-700: #345A55;
$base-800: #253C38;
$base-900: #182523;
$base-hover: #030908;
$base-subtle: #9ACFC7;

{
    "color": {
        "base": {
            "value": "#040B0A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3FBFA",
                "type": "color"
            },
            "100": {
                "value": "#E0F5F2",
                "type": "color"
            },
            "200": {
                "value": "#C3E9E4",
                "type": "color"
            },
            "300": {
                "value": "#99D6CD",
                "type": "color"
            },
            "400": {
                "value": "#72C0B4",
                "type": "color"
            },
            "500": {
                "value": "#51A497",
                "type": "color"
            },
            "600": {
                "value": "#447E75",
                "type": "color"
            },
            "700": {
                "value": "#345A55",
                "type": "color"
            },
            "800": {
                "value": "#253C38",
                "type": "color"
            },
            "900": {
                "value": "#182523",
                "type": "color"
            }
        }
    }
}

Palettes built on #040B0A

Color Lab

Pairs with #040B0A

UI roles & guardrails

In real applications

Scales

Every model

Export