What color is #223F4B?

#223F4B is a dark cyan-blue. In RGB it is rgb(34, 63, 75), and in HSL hsl(198, 38%, 21%).

Is #223F4B accessible as text?

On white, #223F4B has a contrast ratio of 11.17:1 (passes WCAG AA for body text); on black it is 1.88:1 (fails). For text placed on #223F4B, use white for the best readability.

What is the closest Tailwind color to #223F4B?

The nearest Tailwind CSS token is mist-700 (#394447).

What colors go well with #223F4B?

#223F4B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4A2D21. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #223F4B below.

Is #223F4B good for buttons?

#223F4B works well for buttons and highlights, but use white text on #223F4B — black text only reaches 1.88:1, below the 4.5:1 needed for normal-size labels.

Is #223F4B the same as CSS darkslategray?

No — #223F4B is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#223F4B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #223F4B

Not just a swatch — here's how #223F4B works with other colors. Named schemes with #223F4B in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #223F4B Accent #A6C4BF Surface #DEDABF Secondary #9AA0A0 Anchor #1E344A

Charcoal 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 #223F4B Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A6 Anchor #2E3236

Charcoal 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 #223F4B Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #455F6B

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

Vintage Leather Lead · 5 colors

Lead #223F4B Secondary #6F5116 Surface #E2DCC0 Accent #385244 Anchor #56233D

Charcoal 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 #F6F4EF Accent #223F4B Secondary #586267 Support #969386 Ink #16140F

Charcoal 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 Charcoal carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #223F4B 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 38/100

Cool

Reads cool and recessive — calming, technical, good for trust-led UI.

Softness 36/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

High

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

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 31/100

Low

A faint retro warmth without tipping into sepia.

Luxury 65/100

High

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

Brand distinctiveness 16/100

Very low

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

UI accent fit 38/100

Low

Workable accent with care around contrast.

Surface fit 50/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 89/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #223F4B

For UI

For branding

For interior

For fashion

People also use #223F4B with

Feldgrau Prussian Blue Bistre Platinum 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 11.2:1. Use

Subtle surface Use #CCDBE2 for cards and hover fills. Tint 80

Avoid beside #21304A — 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 #223F4B 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: #223F4B;
  --color-base-rgb: 34 63 75;
  --color-base-oklch: oklch(35.0% 0.041 226.6);
  --color-50: #F4F9FB;
  --color-100: #E2EEF3;
  --color-200: #C7DCE6;
  --color-300: #9FC1D0;
  --color-400: #7AA6B8;
  --color-500: #59889C;
  --color-600: #496A79;
  --color-700: #384E57;
  --color-800: #27343A;
  --color-900: #192124;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  charcoal: {
    50: '#F4F9FB',
    100: '#E2EEF3',
    200: '#C7DCE6',
    300: '#9FC1D0',
    400: '#7AA6B8',
    500: '#59889C',
    600: '#496A79',
    700: '#384E57',
    800: '#27343A',
    900: '#192124',
  },
}

$base: #223F4B;
$base-ink: #FFFFFF;
$base-50: #F4F9FB;
$base-100: #E2EEF3;
$base-200: #C7DCE6;
$base-300: #9FC1D0;
$base-400: #7AA6B8;
$base-500: #59889C;
$base-600: #496A79;
$base-700: #384E57;
$base-800: #27343A;
$base-900: #192124;
$base-hover: #1B313B;
$base-subtle: #B1CAD4;

{
    "color": {
        "base": {
            "value": "#223F4B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F9FB",
                "type": "color"
            },
            "100": {
                "value": "#E2EEF3",
                "type": "color"
            },
            "200": {
                "value": "#C7DCE6",
                "type": "color"
            },
            "300": {
                "value": "#9FC1D0",
                "type": "color"
            },
            "400": {
                "value": "#7AA6B8",
                "type": "color"
            },
            "500": {
                "value": "#59889C",
                "type": "color"
            },
            "600": {
                "value": "#496A79",
                "type": "color"
            },
            "700": {
                "value": "#384E57",
                "type": "color"
            },
            "800": {
                "value": "#27343A",
                "type": "color"
            },
            "900": {
                "value": "#192124",
                "type": "color"
            }
        }
    }
}