What color is #243F60?

#243F60 is a dark blue. In RGB it is rgb(36, 63, 96), and in HSL hsl(213, 45%, 26%).

Is #243F60 accessible as text?

On white, #243F60 has a contrast ratio of 10.74:1 (passes WCAG AA for body text); on black it is 1.95:1 (fails). For text placed on #243F60, use white for the best readability.

What is the closest Tailwind color to #243F60?

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

What colors go well with #243F60?

#243F60 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #604524. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #243F60 below.

Is #243F60 good for buttons?

#243F60 works well for buttons and highlights, but use white text on #243F60 — black text only reaches 1.95:1, below the 4.5:1 needed for normal-size labels.

Is #243F60 the same as CSS darkslategray?

No — #243F60 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#243F60 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #243F60

Not just a swatch — here's how #243F60 works with other colors. Named schemes with #243F60 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #243F60 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

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 #243F60 Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 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 #243F60 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #476080

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 #243F60 Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57233B

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 #243F60 Secondary #5B6571 Support #9D8F89 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 #243F60 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 32/100

Cool

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

Softness 35/100

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 39/100

Low

A faint retro warmth without tipping into sepia.

Luxury 66/100

High

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

Brand distinctiveness 26/100

Low

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

UI accent fit 49/100

Moderate

Workable accent with care around contrast.

Surface fit 41/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 86/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #243F60

For UI

For branding

For interior

For fashion

People also use #243F60 with

Teal Russian Violet 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 10.7:1. Use

Subtle surface Use #CDD8E5 for cards and hover fills. Tint 80

Avoid beside #242B60 — 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 #243F60 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: #243F60;
  --color-base-rgb: 36 63 96;
  --color-base-oklch: oklch(36.3% 0.066 254.3);
  --color-50: #F4F7FB;
  --color-100: #E1EAF4;
  --color-200: #C4D4E8;
  --color-300: #9BB5D5;
  --color-400: #7495BE;
  --color-500: #5376A2;
  --color-600: #455E7D;
  --color-700: #35465A;
  --color-800: #262F3B;
  --color-900: #191E25;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  charcoal: {
    50: '#F4F7FB',
    100: '#E1EAF4',
    200: '#C4D4E8',
    300: '#9BB5D5',
    400: '#7495BE',
    500: '#5376A2',
    600: '#455E7D',
    700: '#35465A',
    800: '#262F3B',
    900: '#191E25',
  },
}

$base: #243F60;
$base-ink: #FFFFFF;
$base-50: #F4F7FB;
$base-100: #E1EAF4;
$base-200: #C4D4E8;
$base-300: #9BB5D5;
$base-400: #7495BE;
$base-500: #5376A2;
$base-600: #455E7D;
$base-700: #35465A;
$base-800: #262F3B;
$base-900: #191E25;
$base-hover: #1D334D;
$base-subtle: #B3C4DA;

{
    "color": {
        "base": {
            "value": "#243F60",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F7FB",
                "type": "color"
            },
            "100": {
                "value": "#E1EAF4",
                "type": "color"
            },
            "200": {
                "value": "#C4D4E8",
                "type": "color"
            },
            "300": {
                "value": "#9BB5D5",
                "type": "color"
            },
            "400": {
                "value": "#7495BE",
                "type": "color"
            },
            "500": {
                "value": "#5376A2",
                "type": "color"
            },
            "600": {
                "value": "#455E7D",
                "type": "color"
            },
            "700": {
                "value": "#35465A",
                "type": "color"
            },
            "800": {
                "value": "#262F3B",
                "type": "color"
            },
            "900": {
                "value": "#191E25",
                "type": "color"
            }
        }
    }
}