What color is #040A23?

#040A23 is a very dark, vivid blue. In RGB it is rgb(4, 10, 35), and in HSL hsl(228, 79%, 8%).

Is #040A23 accessible as text?

On white, #040A23 has a contrast ratio of 19.57:1 (passes WCAG AA for body text); on black it is 1.07:1 (fails). For text placed on #040A23, use white for the best readability.

What is the closest Tailwind color to #040A23?

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

What colors go well with #040A23?

#040A23 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #251E04. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #040A23 below.

Is #040A23 good for buttons?

#040A23 works well for buttons and highlights, but use white text on #040A23 — black text only reaches 1.07:1, below the 4.5:1 needed for normal-size labels.

Is #040A23 the same as CSS midnightblue?

No — #040A23 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.

#040A23 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #040A23

Not just a swatch — here's how #040A23 works with other colors. Named schemes with #040A23 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #040A23 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 #040A23 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 #040A23 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #1D2740

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 #040A23 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 #040A23 Secondary #292D37 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 #040A23 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 37/100

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 21/100

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 21/100

Low

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

UI accent fit 7/100

Very low

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

Surface fit 59/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 90/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #040A23

For UI

For branding

For interior

For fashion

People also use #040A23 with

Gunmetal Gray 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 19.6:1. Use

Subtle surface Use #B5C0EB for cards and hover fills. Tint 80

Avoid beside #090425 — 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 #040A23 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: #040A23;
  --color-base-rgb: 4 10 35;
  --color-base-oklch: oklch(15.7% 0.054 267.1);
  --color-50: #F1F3FE;
  --color-100: #DAE0FC;
  --color-200: #B6C3F6;
  --color-300: #8599EB;
  --color-400: #5872DA;
  --color-500: #3551C0;
  --color-600: #304392;
  --color-700: #283467;
  --color-800: #1D2543;
  --color-900: #141829;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  jet-black: {
    50: '#F1F3FE',
    100: '#DAE0FC',
    200: '#B6C3F6',
    300: '#8599EB',
    400: '#5872DA',
    500: '#3551C0',
    600: '#304392',
    700: '#283467',
    800: '#1D2543',
    900: '#141829',
  },
}

$base: #040A23;
$base-ink: #FFFFFF;
$base-50: #F1F3FE;
$base-100: #DAE0FC;
$base-200: #B6C3F6;
$base-300: #8599EB;
$base-400: #5872DA;
$base-500: #3551C0;
$base-600: #304392;
$base-700: #283467;
$base-800: #1D2543;
$base-900: #141829;
$base-hover: #03091D;
$base-subtle: #8E9FE3;

{
    "color": {
        "base": {
            "value": "#040A23",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F3FE",
                "type": "color"
            },
            "100": {
                "value": "#DAE0FC",
                "type": "color"
            },
            "200": {
                "value": "#B6C3F6",
                "type": "color"
            },
            "300": {
                "value": "#8599EB",
                "type": "color"
            },
            "400": {
                "value": "#5872DA",
                "type": "color"
            },
            "500": {
                "value": "#3551C0",
                "type": "color"
            },
            "600": {
                "value": "#304392",
                "type": "color"
            },
            "700": {
                "value": "#283467",
                "type": "color"
            },
            "800": {
                "value": "#1D2543",
                "type": "color"
            },
            "900": {
                "value": "#141829",
                "type": "color"
            }
        }
    }
}

Palettes built on #040A23

Color Lab

Pairs with #040A23

UI roles & guardrails

In real applications

Scales

Every model

Export