What color is #404C4E?

#404C4E is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(64, 76, 78), and in HSL hsl(189, 10%, 28%).

Is #404C4E accessible as text?

On white, #404C4E has a contrast ratio of 8.89:1 (passes WCAG AA for body text); on black it is 2.36:1 (fails). For text placed on #404C4E, use white for the best readability.

What is the closest Tailwind color to #404C4E?

The nearest Tailwind CSS token is neutral-600 (#525252).

What colors go well with #404C4E?

As a neutral, #404C4E 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 #404C4E the same as CSS darkslategray?

No — #404C4E is not the CSS named color darkslategray, but darkslategray (#2F4F4F) 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.

#404C4E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #404C4E

Not just a swatch — here's how #404C4E works with other colors. Named schemes with #404C4E in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #404C4E Surface #14161A Highlight #F4F6F8 Secondary #596671 Accent #626D6F

Outer Space is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Outer Space.

Vintage Leather Lead · 5 colors

Lead #404C4E Secondary #715117 Surface #E3DCC0 Accent #395143 Anchor #56233F

Outer Space plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Modern Café Dominant · 5 colors

Dominant #404C4E Anchor #372C1D Surface #EBE5D0 Accent #7F9D73 Secondary #3A3933

Outer Space anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.

Japanese Sand Base · 5 colors

Base #404C4E Surface #ECEADC Highlight #F4F2E7 Secondary #B4B19F Ink #2A2723

Outer Space 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.

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #404C4E Secondary #6D7172 Support #979286 Ink #16140F

Outer Space 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 Outer Space carrying the quiet middle.

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Color Lab

How #404C4E 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 43/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 55/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 2/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 29/100

Low

A faint retro warmth without tipping into sepia.

Luxury 58/100

Moderate

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 41/100

Moderate

Workable accent with care around contrast.

Surface fit 54/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 96/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #404C4E

For UI

For branding

For interior

For fashion

People also use #404C4E with

Ebony Charcoal Taupe Platinum Outer Space

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 8.9:1. Use

Subtle surface Use #D8DCDD for cards and hover fills. Tint 80

Avoid beside #40484F — 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 #404C4E 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: #404C4E;
  --color-base-rgb: 64 76 78;
  --color-base-oklch: oklch(40.7% 0.016 208.7);
  --color-50: #F7F8F8;
  --color-100: #E8ECED;
  --color-200: #D2D9DA;
  --color-300: #B1BCBE;
  --color-400: #919FA1;
  --color-500: #728183;
  --color-600: #5B6567;
  --color-700: #434A4B;
  --color-800: #2E3233;
  --color-900: #1D2020;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  outer-space: {
    50: '#F7F8F8',
    100: '#E8ECED',
    200: '#D2D9DA',
    300: '#B1BCBE',
    400: '#919FA1',
    500: '#728183',
    600: '#5B6567',
    700: '#434A4B',
    800: '#2E3233',
    900: '#1D2020',
  },
}

$base: #404C4E;
$base-ink: #FFFFFF;
$base-50: #F7F8F8;
$base-100: #E8ECED;
$base-200: #D2D9DA;
$base-300: #B1BCBE;
$base-400: #919FA1;
$base-500: #728183;
$base-600: #5B6567;
$base-700: #434A4B;
$base-800: #2E3233;
$base-900: #1D2020;
$base-hover: #333D3F;
$base-subtle: #C4CBCC;

{
    "color": {
        "base": {
            "value": "#404C4E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F7F8F8",
                "type": "color"
            },
            "100": {
                "value": "#E8ECED",
                "type": "color"
            },
            "200": {
                "value": "#D2D9DA",
                "type": "color"
            },
            "300": {
                "value": "#B1BCBE",
                "type": "color"
            },
            "400": {
                "value": "#919FA1",
                "type": "color"
            },
            "500": {
                "value": "#728183",
                "type": "color"
            },
            "600": {
                "value": "#5B6567",
                "type": "color"
            },
            "700": {
                "value": "#434A4B",
                "type": "color"
            },
            "800": {
                "value": "#2E3233",
                "type": "color"
            },
            "900": {
                "value": "#1D2020",
                "type": "color"
            }
        }
    }
}

Palettes built on #404C4E

Color Lab

Pairs with #404C4E

UI roles & guardrails

In real applications

Scales

Every model

Export