What color is #21312E?

#21312E is a very dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(33, 49, 46), and in HSL hsl(169, 20%, 16%).

Is #21312E accessible as text?

On white, #21312E has a contrast ratio of 13.61:1 (passes WCAG AA for body text); on black it is 1.54:1 (fails). For text placed on #21312E, use white for the best readability.

What is the closest Tailwind color to #21312E?

The nearest Tailwind CSS token is zinc-800 (#27272A).

What colors go well with #21312E?

As a neutral, #21312E 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 #21312E the same as CSS darkslategray?

No — #21312E 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.

#21312E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #21312E

Not just a swatch — here's how #21312E works with other colors. Named schemes with #21312E in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #21312E Surface #14161A Highlight #F4F6F8 Secondary #586771 Accent #41504D

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

Vintage Leather Lead · 5 colors

Lead #21312E Secondary #734F18 Surface #E4DCC0 Accent #3A5142 Anchor #5B241E

Gunmetal Gray 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 #21312E Surface #EDEADC Highlight #F5F1E7 Secondary #B5B19F Ink #2A2723

Gunmetal Gray 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 #21312E Anchor #141210 Accent #BAA94D Secondary #1E2C2A Surface #F1EDE3

Gunmetal Gray 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 #21312E Secondary #4E5352 Support #979286 Ink #16140F

Gunmetal Gray 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 Gunmetal Gray carrying the quiet middle.

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Color Lab

How #21312E 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 32/100

Low

Middle-weight — neither delicate nor heavy.

Depth 66/100

High

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

Naturalness 11/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 26/100

Low

A faint retro warmth without tipping into sepia.

Luxury 67/100

High

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 22/100

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 95/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #21312E

For UI

For branding

For interior

For fashion

People also use #21312E with

Brunswick Green Gunmetal Gray Bistre 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 13.6:1. Use

Subtle surface Use #CEDAD8 for cards and hover fills. Tint 80

Avoid beside #212F31 — 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 #21312E 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: #21312E;
  --color-base-rgb: 33 49 46;
  --color-base-oklch: oklch(29.8% 0.022 181.9);
  --color-50: #F6F9F8;
  --color-100: #E6EFED;
  --color-200: #CEDEDB;
  --color-300: #ABC5C0;
  --color-400: #88AAA3;
  --color-500: #698C86;
  --color-600: #546D69;
  --color-700: #3F4F4D;
  --color-800: #2C3533;
  --color-900: #1C2120;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  gunmetal-gray: {
    50: '#F6F9F8',
    100: '#E6EFED',
    200: '#CEDEDB',
    300: '#ABC5C0',
    400: '#88AAA3',
    500: '#698C86',
    600: '#546D69',
    700: '#3F4F4D',
    800: '#2C3533',
    900: '#1C2120',
  },
}

$base: #21312E;
$base-ink: #FFFFFF;
$base-50: #F6F9F8;
$base-100: #E6EFED;
$base-200: #CEDEDB;
$base-300: #ABC5C0;
$base-400: #88AAA3;
$base-500: #698C86;
$base-600: #546D69;
$base-700: #3F4F4D;
$base-800: #2C3533;
$base-900: #1C2120;
$base-hover: #1A2725;
$base-subtle: #B5C9C5;

{
    "color": {
        "base": {
            "value": "#21312E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F9F8",
                "type": "color"
            },
            "100": {
                "value": "#E6EFED",
                "type": "color"
            },
            "200": {
                "value": "#CEDEDB",
                "type": "color"
            },
            "300": {
                "value": "#ABC5C0",
                "type": "color"
            },
            "400": {
                "value": "#88AAA3",
                "type": "color"
            },
            "500": {
                "value": "#698C86",
                "type": "color"
            },
            "600": {
                "value": "#546D69",
                "type": "color"
            },
            "700": {
                "value": "#3F4F4D",
                "type": "color"
            },
            "800": {
                "value": "#2C3533",
                "type": "color"
            },
            "900": {
                "value": "#1C2120",
                "type": "color"
            }
        }
    }
}