What color is #243F67?

#243F67 is a dark blue. In RGB it is rgb(36, 63, 103), and in HSL hsl(216, 48%, 27%).

Is #243F67 accessible as text?

On white, #243F67 has a contrast ratio of 10.60:1 (passes WCAG AA for body text); on black it is 1.98:1 (fails). For text placed on #243F67, use white for the best readability.

What is the closest Tailwind color to #243F67?

The nearest Tailwind CSS token is sky-900 (#024A70).

What colors go well with #243F67?

#243F67 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #664B24. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #243F67 below.

Is #243F67 good for buttons?

#243F67 works well for buttons and highlights, but use white text on #243F67 — black text only reaches 1.98:1, below the 4.5:1 needed for normal-size labels.

Is #243F67 the same as CSS darkslategray?

No — #243F67 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#243F67 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #243F67

Not just a swatch — here's how #243F67 works with other colors. Named schemes with #243F67 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #243F67 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Yale Blue 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 #243F67 Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 Anchor #2E3236

Yale Blue 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 #243F67 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #476187

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

Vintage Leather Lead · 5 colors

Lead #243F67 Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57223A

Yale Blue 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 #243F67 Secondary #5C6675 Support #9D8F89 Ink #16140F

Yale Blue 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 Yale Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #243F67 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 30/100

Cool

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

Softness 34/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

High

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 42/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 66/100

High

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

Brand distinctiveness 30/100

Low

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

UI accent fit 54/100

Moderate

Workable accent with care around contrast.

Surface fit 38/100

Low

Usable as a tinted surface in measured doses.

Print safety 85/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #243F67

For UI

For branding

For interior

For fashion

People also use #243F67 with

Teal Midnight Blue Sepia 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 10.6:1. Use

Subtle surface Use #CDD7E7 for cards and hover fills. Tint 80

Avoid beside #242866 — 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 #243F67 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: #243F67;
  --color-base-rgb: 36 63 103;
  --color-base-oklch: oklch(36.7% 0.077 258.1);
  --color-50: #F3F7FB;
  --color-100: #E0E9F5;
  --color-200: #C3D2EA;
  --color-300: #99B1D7;
  --color-400: #7191C1;
  --color-500: #5072A5;
  --color-600: #435B7F;
  --color-700: #34445B;
  --color-800: #252E3C;
  --color-900: #181D25;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F3F7FB',
    100: '#E0E9F5',
    200: '#C3D2EA',
    300: '#99B1D7',
    400: '#7191C1',
    500: '#5072A5',
    600: '#435B7F',
    700: '#34445B',
    800: '#252E3C',
    900: '#181D25',
  },
}

$base: #243F67;
$base-ink: #FFFFFF;
$base-50: #F3F7FB;
$base-100: #E0E9F5;
$base-200: #C3D2EA;
$base-300: #99B1D7;
$base-400: #7191C1;
$base-500: #5072A5;
$base-600: #435B7F;
$base-700: #34445B;
$base-800: #252E3C;
$base-900: #181D25;
$base-hover: #1D3252;
$base-subtle: #B3C3DC;

{
    "color": {
        "base": {
            "value": "#243F67",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F7FB",
                "type": "color"
            },
            "100": {
                "value": "#E0E9F5",
                "type": "color"
            },
            "200": {
                "value": "#C3D2EA",
                "type": "color"
            },
            "300": {
                "value": "#99B1D7",
                "type": "color"
            },
            "400": {
                "value": "#7191C1",
                "type": "color"
            },
            "500": {
                "value": "#5072A5",
                "type": "color"
            },
            "600": {
                "value": "#435B7F",
                "type": "color"
            },
            "700": {
                "value": "#34445B",
                "type": "color"
            },
            "800": {
                "value": "#252E3C",
                "type": "color"
            },
            "900": {
                "value": "#181D25",
                "type": "color"
            }
        }
    }
}