What color is #243A71?

#243A71 is a dark blue. In RGB it is rgb(36, 58, 113), and in HSL hsl(223, 52%, 29%).

Is #243A71 accessible as text?

On white, #243A71 has a contrast ratio of 10.94:1 (passes WCAG AA for body text); on black it is 1.92:1 (fails). For text placed on #243A71, use white for the best readability.

What is the closest Tailwind color to #243A71?

The nearest Tailwind CSS token is blue-900 (#1C398E).

What colors go well with #243A71?

#243A71 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #705B23. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #243A71 below.

Is #243A71 good for buttons?

#243A71 works well for buttons and highlights, but use white text on #243A71 — black text only reaches 1.92:1, below the 4.5:1 needed for normal-size labels.

Is #243A71 the same as CSS darkslateblue?

No — #243A71 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#243A71 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #243A71

Not just a swatch — here's how #243A71 works with other colors. Named schemes with #243A71 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #243A71 Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Yale Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Luxury Packaging Feature · 5 colors

Feature #243A71 Anchor #141210 Accent #DD965A Secondary #242933 Surface #F4ECE3

Yale Blue carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Moody Editorial Color · 5 colors

Color #243A71 Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #1C193F

Yale Blue adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from Yale Blue.

Vintage Leather Lead · 5 colors

Lead #243A71 Secondary #7F4536 Surface #EED7C2 Accent #365246 Anchor #58223A

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 #F8F4EF Accent #243A71 Secondary #5A6478 Support #9D8F88 Ink #18140F

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 #243A71 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 26/100

Cool

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

Softness 32/100

Low

Middle-weight — neither delicate nor heavy.

Depth 63/100

High

Deep and grounding — anchors a layout, strong dark-mode base.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 43/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 69/100

High

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

Brand distinctiveness 38/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 57/100

Moderate

Workable accent with care around contrast.

Surface fit 31/100

Low

Usable as a tinted surface in measured doses.

Print safety 82/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #243A71

For UI

For branding

For interior

For fashion

People also use #243A71 with

Teal Indigo Coffee 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 10.9:1. Use

Subtle surface Use #CDD5E8 for cards and hover fills. Tint 80

Avoid beside #272370 — 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 #243A71 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: #243A71;
  --color-base-rgb: 36 58 113;
  --color-base-oklch: oklch(36.2% 0.099 265.4);
  --color-50: #F3F5FC;
  --color-100: #DFE6F6;
  --color-200: #C1CDEB;
  --color-300: #96A9D9;
  --color-400: #6E86C4;
  --color-500: #4D67A8;
  --color-600: #415381;
  --color-700: #323E5C;
  --color-800: #242B3D;
  --color-900: #181C26;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  yale-blue: {
    50: '#F3F5FC',
    100: '#DFE6F6',
    200: '#C1CDEB',
    300: '#96A9D9',
    400: '#6E86C4',
    500: '#4D67A8',
    600: '#415381',
    700: '#323E5C',
    800: '#242B3D',
    900: '#181C26',
  },
}

$base: #243A71;
$base-ink: #FFFFFF;
$base-50: #F3F5FC;
$base-100: #DFE6F6;
$base-200: #C1CDEB;
$base-300: #96A9D9;
$base-400: #6E86C4;
$base-500: #4D67A8;
$base-600: #415381;
$base-700: #323E5C;
$base-800: #242B3D;
$base-900: #181C26;
$base-hover: #1C2E5A;
$base-subtle: #B3BFDE;

{
    "color": {
        "base": {
            "value": "#243A71",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F5FC",
                "type": "color"
            },
            "100": {
                "value": "#DFE6F6",
                "type": "color"
            },
            "200": {
                "value": "#C1CDEB",
                "type": "color"
            },
            "300": {
                "value": "#96A9D9",
                "type": "color"
            },
            "400": {
                "value": "#6E86C4",
                "type": "color"
            },
            "500": {
                "value": "#4D67A8",
                "type": "color"
            },
            "600": {
                "value": "#415381",
                "type": "color"
            },
            "700": {
                "value": "#323E5C",
                "type": "color"
            },
            "800": {
                "value": "#242B3D",
                "type": "color"
            },
            "900": {
                "value": "#181C26",
                "type": "color"
            }
        }
    }
}