What color is #243F48?

#243F48 is a dark low-chroma blue-gray with a subtle blue cast. In RGB it is rgb(36, 63, 72), and in HSL hsl(195, 33%, 21%).

Is #243F48 accessible as text?

On white, #243F48 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 #243F48, use white for the best readability.

What is the closest Tailwind color to #243F48?

The nearest Tailwind CSS token is gray-700 (#364153).

What colors go well with #243F48?

As a neutral, #243F48 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 #243F48 the same as CSS darkslategray?

No — #243F48 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.

#243F48 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #243F48

Not just a swatch — here's how #243F48 works with other colors. Named schemes with #243F48 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #243F48 Accent #A6C4BF Surface #DFDABF Secondary #9AA0A0 Anchor #1E354A

Onyx 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 #243F48 Secondary #AEB4B8 Surface #F1F2F0 Support #7B93A5 Anchor #2E3236

Onyx 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 #243F48 Surface #14161A Highlight #F4F6F8 Secondary #596672 Accent #475F68

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

Vintage Leather Lead · 5 colors

Lead #243F48 Secondary #705116 Surface #E2DCC0 Accent #385244 Anchor #56233E

Onyx 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 #243F48 Secondary #596266 Support #969386 Ink #16140F

Onyx 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 Onyx carrying the quiet middle.

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Color Lab

How #243F48 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 39/100

Neutral

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

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 30/100

Low

A faint retro warmth without tipping into sepia.

Luxury 64/100

High

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

Brand distinctiveness 14/100

Very low

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

UI accent fit 37/100

Low

Workable accent with care around contrast.

Surface fit 51/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 90/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #243F48

For UI

For branding

For interior

For fashion

People also use #243F48 with

Feldgrau Prussian Blue 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 11.2:1. Use

Subtle surface Use #CDDBE0 for cards and hover fills. Tint 80

Avoid beside #243347 — 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 #243F48 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: #243F48;
  --color-base-rgb: 36 63 72;
  --color-base-oklch: oklch(35.0% 0.036 221.2);
  --color-50: #F5F9FA;
  --color-100: #E3EEF2;
  --color-200: #C9DDE4;
  --color-300: #A2C2CD;
  --color-400: #7EA7B4;
  --color-500: #5D8997;
  --color-600: #4C6B75;
  --color-700: #3A4E55;
  --color-800: #293438;
  --color-900: #1A2123;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F5F9FA',
    100: '#E3EEF2',
    200: '#C9DDE4',
    300: '#A2C2CD',
    400: '#7EA7B4',
    500: '#5D8997',
    600: '#4C6B75',
    700: '#3A4E55',
    800: '#293438',
    900: '#1A2123',
  },
}

$base: #243F48;
$base-ink: #FFFFFF;
$base-50: #F5F9FA;
$base-100: #E3EEF2;
$base-200: #C9DDE4;
$base-300: #A2C2CD;
$base-400: #7EA7B4;
$base-500: #5D8997;
$base-600: #4C6B75;
$base-700: #3A4E55;
$base-800: #293438;
$base-900: #1A2123;
$base-hover: #1D3239;
$base-subtle: #B3CAD2;

{
    "color": {
        "base": {
            "value": "#243F48",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F9FA",
                "type": "color"
            },
            "100": {
                "value": "#E3EEF2",
                "type": "color"
            },
            "200": {
                "value": "#C9DDE4",
                "type": "color"
            },
            "300": {
                "value": "#A2C2CD",
                "type": "color"
            },
            "400": {
                "value": "#7EA7B4",
                "type": "color"
            },
            "500": {
                "value": "#5D8997",
                "type": "color"
            },
            "600": {
                "value": "#4C6B75",
                "type": "color"
            },
            "700": {
                "value": "#3A4E55",
                "type": "color"
            },
            "800": {
                "value": "#293438",
                "type": "color"
            },
            "900": {
                "value": "#1A2123",
                "type": "color"
            }
        }
    }
}