What color is #243F41?

#243F41 is a dark low-chroma cool gray with a subtle cool cast. In RGB it is rgb(36, 63, 65), and in HSL hsl(184, 29%, 20%).

Is #243F41 accessible as text?

On white, #243F41 has a contrast ratio of 11.28:1 (passes WCAG AA for body text); on black it is 1.86:1 (fails). For text placed on #243F41, use white for the best readability.

What is the closest Tailwind color to #243F41?

The nearest Tailwind CSS token is neutral-700 (#404040).

What colors go well with #243F41?

As a neutral, #243F41 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 #243F41 the same as CSS darkslategray?

No — #243F41 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.

#243F41 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #243F41

Not just a swatch — here's how #243F41 works with other colors. Named schemes with #243F41 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #243F41 Accent #A6C4BE Surface #DFDABE Secondary #9AA0A0 Anchor #1D3549

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 #243F41 Secondary #AEB4B8 Surface #F1F2F0 Support #7A94A5 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 #243F41 Surface #14161A Highlight #F4F6F8 Secondary #596771 Accent #465F61

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 #243F41 Secondary #715017 Surface #E3DCC0 Accent #395143 Anchor #552340

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 #243F41 Secondary #586262 Support #979286 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 #243F41 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 36/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

High

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

Naturalness 4/100

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 13/100

Very low

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

UI accent fit 35/100

Low

Workable accent with care around contrast.

Surface fit 52/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 91/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #243F41

For UI

For branding

For interior

For fashion

People also use #243F41 with

Hunter 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 11.3:1. Use

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

Avoid beside #243642 — 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 #243F41 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: #243F41;
  --color-base-rgb: 36 63 65;
  --color-base-oklch: oklch(34.7% 0.033 201.8);
  --color-50: #F5F9FA;
  --color-100: #E4F0F1;
  --color-200: #CAE0E2;
  --color-300: #A5C8CA;
  --color-400: #81AEB1;
  --color-500: #619194;
  --color-600: #4F7173;
  --color-700: #3C5253;
  --color-800: #293637;
  --color-900: #1B2223;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  onyx: {
    50: '#F5F9FA',
    100: '#E4F0F1',
    200: '#CAE0E2',
    300: '#A5C8CA',
    400: '#81AEB1',
    500: '#619194',
    600: '#4F7173',
    700: '#3C5253',
    800: '#293637',
    900: '#1B2223',
  },
}

$base: #243F41;
$base-ink: #FFFFFF;
$base-50: #F5F9FA;
$base-100: #E4F0F1;
$base-200: #CAE0E2;
$base-300: #A5C8CA;
$base-400: #81AEB1;
$base-500: #619194;
$base-600: #4F7173;
$base-700: #3C5253;
$base-800: #293637;
$base-900: #1B2223;
$base-hover: #1D3335;
$base-subtle: #B4CDCF;

{
    "color": {
        "base": {
            "value": "#243F41",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F9FA",
                "type": "color"
            },
            "100": {
                "value": "#E4F0F1",
                "type": "color"
            },
            "200": {
                "value": "#CAE0E2",
                "type": "color"
            },
            "300": {
                "value": "#A5C8CA",
                "type": "color"
            },
            "400": {
                "value": "#81AEB1",
                "type": "color"
            },
            "500": {
                "value": "#619194",
                "type": "color"
            },
            "600": {
                "value": "#4F7173",
                "type": "color"
            },
            "700": {
                "value": "#3C5253",
                "type": "color"
            },
            "800": {
                "value": "#293637",
                "type": "color"
            },
            "900": {
                "value": "#1B2223",
                "type": "color"
            }
        }
    }
}