What color is #424B40?

#424B40 is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(66, 75, 64), and in HSL hsl(109, 8%, 27%).

Is #424B40 accessible as text?

On white, #424B40 has a contrast ratio of 9.08:1 (passes WCAG AA for body text); on black it is 2.31:1 (fails). For text placed on #424B40, use white for the best readability.

What is the closest Tailwind color to #424B40?

The nearest Tailwind CSS token is stone-700 (#44403B).

What colors go well with #424B40?

As a neutral, #424B40 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 #424B40 the same as CSS darkslategray?

No — #424B40 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.

#424B40 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #424B40

Not just a swatch — here's how #424B40 works with other colors. Named schemes with #424B40 in its natural role, and a note on why the supporting colors balance it.

Botanical Studio Lead · 5 colors

Lead #424B40 Secondary #4D6B3B Accent #AE6B00 Surface #EFEAD6 Anchor #3C2F21

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

Tech Product Signal · 5 colors

Signal #424B40 Surface #13161A Highlight #F4F6F8 Secondary #576770 Accent #646C62

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 #424B40 Secondary #754E1C Surface #E6DBC0 Accent #3D513F Anchor #5B2322

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.

Japanese Sand Base · 5 colors

Base #424B40 Surface #EEE9DC Highlight #F5F1E7 Secondary #B7B09F Ink #2B2723

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 #F7F4EF Accent #424B40 Secondary #6D706C Support #989286 Ink #17140F

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 #424B40 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 42/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 56/100

Moderate

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

Naturalness 37/100

Low

Loosely natural — an earthy edge without being rustic.

Vintage feel 40/100

Low

A faint retro warmth without tipping into sepia.

Luxury 59/100

Moderate

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

Brand distinctiveness 8/100

Very low

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

UI accent fit 42/100

Moderate

Workable accent with care around contrast.

Surface fit 52/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 95/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #424B40

For UI

For branding

For interior

For fashion

People also use #424B40 with

Ebony Outer Space Charcoal Platinum

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 9.1:1. Use

Subtle surface Use #D8DCD8 for cards and hover fills. Tint 80

Avoid beside #3F4A41 — 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 #424B40 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: #424B40;
  --color-base-rgb: 66 75 64;
  --color-base-oklch: oklch(40.1% 0.022 140.0);
  --color-50: #F7F8F7;
  --color-100: #EAECE9;
  --color-200: #D4D9D3;
  --color-300: #B4BDB2;
  --color-400: #95A092;
  --color-500: #768173;
  --color-600: #5E665C;
  --color-700: #454B44;
  --color-800: #2F322F;
  --color-900: #1E201D;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  outer-space: {
    50: '#F7F8F7',
    100: '#EAECE9',
    200: '#D4D9D3',
    300: '#B4BDB2',
    400: '#95A092',
    500: '#768173',
    600: '#5E665C',
    700: '#454B44',
    800: '#2F322F',
    900: '#1E201D',
  },
}

$base: #424B40;
$base-ink: #FFFFFF;
$base-50: #F7F8F7;
$base-100: #EAECE9;
$base-200: #D4D9D3;
$base-300: #B4BDB2;
$base-400: #95A092;
$base-500: #768173;
$base-600: #5E665C;
$base-700: #454B44;
$base-800: #2F322F;
$base-900: #1E201D;
$base-hover: #343B33;
$base-subtle: #C5CBC4;

{
    "color": {
        "base": {
            "value": "#424B40",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F7F8F7",
                "type": "color"
            },
            "100": {
                "value": "#EAECE9",
                "type": "color"
            },
            "200": {
                "value": "#D4D9D3",
                "type": "color"
            },
            "300": {
                "value": "#B4BDB2",
                "type": "color"
            },
            "400": {
                "value": "#95A092",
                "type": "color"
            },
            "500": {
                "value": "#768173",
                "type": "color"
            },
            "600": {
                "value": "#5E665C",
                "type": "color"
            },
            "700": {
                "value": "#454B44",
                "type": "color"
            },
            "800": {
                "value": "#2F322F",
                "type": "color"
            },
            "900": {
                "value": "#1E201D",
                "type": "color"
            }
        }
    }
}

Palettes built on #424B40

Color Lab

Pairs with #424B40

UI roles & guardrails

In real applications

Scales

Every model

Export