What color is #040C10?

#040C10 is a very dark low-chroma blue-gray with a subtle blue cast. In RGB it is rgb(4, 12, 16), and in HSL hsl(200, 60%, 4%).

Is #040C10 accessible as text?

On white, #040C10 has a contrast ratio of 19.71:1 (passes WCAG AA for body text); on black it is 1.07:1 (fails). For text placed on #040C10, use white for the best readability.

What is the closest Tailwind color to #040C10?

The nearest Tailwind CSS token is zinc-950 (#09090B).

What colors go well with #040C10?

As a neutral, #040C10 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 #040C10 the same as CSS black?

No — #040C10 is not the CSS named color black, but black (#000000) is the closest CSS named color.

#040C10 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #040C10

Not just a swatch — here's how #040C10 works with other colors. Named schemes with #040C10 in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #040C10 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #1E272B

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 #040C10 Secondary #6F5116 Surface #E2DCC0 Accent #385244 Anchor #56233D

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 #040C10 Surface #ECEADC Highlight #F4F2E7 Secondary #B3B19F 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.

Coastal Morning Lead · 5 colors

Lead #040C10 Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1E344A

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 #F6F4EF Accent #040C10 Secondary #282B2D Support #969386 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 #040C10 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 45/100

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 0/100

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 6/100

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 70/100

High

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

Print safety 96/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #040C10

For UI

For branding

For interior

For fashion

People also use #040C10 with

Sacramento Green Jet Black Platinum Charcoal

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 19.7:1. Use

Subtle surface Use #B9D5E3 for cards and hover fills. Tint 80

Avoid beside #040810 — 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 #040C10 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: #040C10;
  --color-base-rgb: 4 12 16;
  --color-base-oklch: oklch(14.7% 0.017 226.7);
  --color-50: #F2F9FC;
  --color-100: #DEEFF8;
  --color-200: #BEDEEF;
  --color-300: #91C5DE;
  --color-400: #67AACB;
  --color-500: #468CAF;
  --color-600: #3C6D86;
  --color-700: #2F4F60;
  --color-800: #22353F;
  --color-900: #162127;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#F2F9FC',
    100: '#DEEFF8',
    200: '#BEDEEF',
    300: '#91C5DE',
    400: '#67AACB',
    500: '#468CAF',
    600: '#3C6D86',
    700: '#2F4F60',
    800: '#22353F',
    900: '#162127',
  },
}

$base: #040C10;
$base-ink: #FFFFFF;
$base-50: #F2F9FC;
$base-100: #DEEFF8;
$base-200: #BEDEEF;
$base-300: #91C5DE;
$base-400: #67AACB;
$base-500: #468CAF;
$base-600: #3C6D86;
$base-700: #2F4F60;
$base-800: #22353F;
$base-900: #162127;
$base-hover: #030A0D;
$base-subtle: #94C1D7;

{
    "color": {
        "base": {
            "value": "#040C10",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F9FC",
                "type": "color"
            },
            "100": {
                "value": "#DEEFF8",
                "type": "color"
            },
            "200": {
                "value": "#BEDEEF",
                "type": "color"
            },
            "300": {
                "value": "#91C5DE",
                "type": "color"
            },
            "400": {
                "value": "#67AACB",
                "type": "color"
            },
            "500": {
                "value": "#468CAF",
                "type": "color"
            },
            "600": {
                "value": "#3C6D86",
                "type": "color"
            },
            "700": {
                "value": "#2F4F60",
                "type": "color"
            },
            "800": {
                "value": "#22353F",
                "type": "color"
            },
            "900": {
                "value": "#162127",
                "type": "color"
            }
        }
    }
}

Palettes built on #040C10

Color Lab

Pairs with #040C10

UI roles & guardrails

In real applications

Scales

Every model

Export