What color is #21273B?

#21273B is a dark, muted blue. In RGB it is rgb(33, 39, 59), and in HSL hsl(226, 28%, 18%).

Is #21273B accessible as text?

On white, #21273B has a contrast ratio of 14.81:1 (passes WCAG AA for body text); on black it is 1.42:1 (fails). For text placed on #21273B, use white for the best readability.

What is the closest Tailwind color to #21273B?

The nearest Tailwind CSS token is mauve-800 (#2A212C).

What colors go well with #21273B?

#21273B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #3B3521. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #21273B below.

Is #21273B good for buttons?

#21273B works well for buttons and highlights, but use white text on #21273B — black text only reaches 1.42:1, below the 4.5:1 needed for normal-size labels.

Is #21273B the same as CSS midnightblue?

No — #21273B is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color.

#21273B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #21273B

Not just a swatch — here's how #21273B works with other colors. Named schemes with #21273B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #21273B Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Gunmetal Gray 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 #21273B Secondary #AEB4B8 Surface #F1F2F0 Support #7E92A7 Anchor #2E3236

Gunmetal Gray 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 #21273B Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #40465A

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 #21273B Secondary #7F4535 Surface #EED7C2 Accent #365247 Anchor #582239

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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #21273B Secondary #494C54 Support #9D8F88 Ink #18140F

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.

Build a working theme in the generator →

Color Lab

How #21273B 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 41/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 29/100

Low

Firm and assertive — carries weight and contrast.

Depth 69/100

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 28/100

Low

A faint retro warmth without tipping into sepia.

Luxury 70/100

High

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

Brand distinctiveness 15/100

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 55/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 94/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #21273B

For UI

For branding

For interior

For fashion

People also use #21273B with

Dark Slate Gray Russian Violet Espresso Gainsboro 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 14.8:1. Use

Subtle surface Use #CDD1DE for cards and hover fills. Tint 80

Avoid beside #24213B — 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 #21273B at work across the surfaces designers actually ship.

Website / UI

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Build faster.

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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: #21273B;
  --color-base-rgb: 33 39 59;
  --color-base-oklch: oklch(27.7% 0.038 270.9);
  --color-50: #F5F6FA;
  --color-100: #E5E7F1;
  --color-200: #CBD0E2;
  --color-300: #A6AECA;
  --color-400: #828DB0;
  --color-500: #626D93;
  --color-600: #4F5872;
  --color-700: #3C4153;
  --color-800: #2A2D37;
  --color-900: #1B1D22;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  gunmetal-gray: {
    50: '#F5F6FA',
    100: '#E5E7F1',
    200: '#CBD0E2',
    300: '#A6AECA',
    400: '#828DB0',
    500: '#626D93',
    600: '#4F5872',
    700: '#3C4153',
    800: '#2A2D37',
    900: '#1B1D22',
  },
}

$base: #21273B;
$base-ink: #FFFFFF;
$base-50: #F5F6FA;
$base-100: #E5E7F1;
$base-200: #CBD0E2;
$base-300: #A6AECA;
$base-400: #828DB0;
$base-500: #626D93;
$base-600: #4F5872;
$base-700: #3C4153;
$base-800: #2A2D37;
$base-900: #1B1D22;
$base-hover: #1A1F2F;
$base-subtle: #B3B9CE;

{
    "color": {
        "base": {
            "value": "#21273B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F6FA",
                "type": "color"
            },
            "100": {
                "value": "#E5E7F1",
                "type": "color"
            },
            "200": {
                "value": "#CBD0E2",
                "type": "color"
            },
            "300": {
                "value": "#A6AECA",
                "type": "color"
            },
            "400": {
                "value": "#828DB0",
                "type": "color"
            },
            "500": {
                "value": "#626D93",
                "type": "color"
            },
            "600": {
                "value": "#4F5872",
                "type": "color"
            },
            "700": {
                "value": "#3C4153",
                "type": "color"
            },
            "800": {
                "value": "#2A2D37",
                "type": "color"
            },
            "900": {
                "value": "#1B1D22",
                "type": "color"
            }
        }
    }
}