What color is #2A4E9D?

#2A4E9D is a dark blue. In RGB it is rgb(42, 78, 157), and in HSL hsl(221, 58%, 39%).

Is #2A4E9D accessible as text?

On white, #2A4E9D has a contrast ratio of 7.85:1 (passes WCAG AA for body text); on black it is 2.68:1 (fails). For text placed on #2A4E9D, use white for the best readability.

What is the closest Tailwind color to #2A4E9D?

The nearest Tailwind CSS token is sky-800 (#00598A).

What colors go well with #2A4E9D?

#2A4E9D pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #9D792A. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #2A4E9D below.

Is #2A4E9D good for buttons?

#2A4E9D works well for buttons and highlights, but use white text on #2A4E9D — black text only reaches 2.68:1, below the 4.5:1 needed for normal-size labels.

Is #2A4E9D the same as CSS darkslateblue?

No — #2A4E9D is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#2A4E9D Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #2A4E9D

Not just a swatch — here's how #2A4E9D works with other colors. Named schemes with #2A4E9D in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #2A4E9D Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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

Tech Product Signal · 5 colors

Signal #2A4E9D Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #4F73BD

Cobalt 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 Cobalt Blue.

Vintage Leather Lead · 5 colors

Lead #2A4E9D Secondary #7F4536 Surface #EED7C2 Accent #375246 Anchor #57223A

Cobalt 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.

Berry & Cream Lead · 5 colors

Lead #2A4E9D Surface #F6E5D8 Anchor #5B2144 Accent #E4C2CA Secondary #322B2F

Cobalt Blue sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #2A4E9D Secondary #6D7B98 Support #9D8F88 Ink #18140F

Cobalt 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 Cobalt Blue carrying the quiet middle.

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Color Lab

How #2A4E9D 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 16/100

Cool

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

Softness 35/100

Low

Middle-weight — neither delicate nor heavy.

Depth 57/100

Moderate

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 40/100

Low

A faint retro warmth without tipping into sepia.

Luxury 61/100

High

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

Brand distinctiveness 37/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 88/100

Very high

Strong interactive accent — visible and can carry a legible label.

Surface fit 15/100

Very low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 75/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #2A4E9D

For UI

For branding

For interior

For fashion

People also use #2A4E9D with

Verdigris Dark Slate Blue Copper 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 7.9:1. Use

Subtle surface Use #D3DBED for cards and hover fills. Tint 80

Avoid beside #2C2A9D — 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 #2A4E9D at work across the surfaces designers actually ship.

Website / UI

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Build faster.

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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: #2A4E9D;
  --color-base-rgb: 42 78 157;
  --color-base-oklch: oklch(44.3% 0.135 263.5);
  --color-50: #F2F6FC;
  --color-100: #DEE6F7;
  --color-200: #BFCEEE;
  --color-300: #92AADD;
  --color-400: #6987C9;
  --color-500: #4768AD;
  --color-600: #3D5485;
  --color-700: #303F5F;
  --color-800: #232B3E;
  --color-900: #171C26;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cobalt-blue: {
    50: '#F2F6FC',
    100: '#DEE6F7',
    200: '#BFCEEE',
    300: '#92AADD',
    400: '#6987C9',
    500: '#4768AD',
    600: '#3D5485',
    700: '#303F5F',
    800: '#232B3E',
    900: '#171C26',
  },
}

$base: #2A4E9D;
$base-ink: #FFFFFF;
$base-50: #F2F6FC;
$base-100: #DEE6F7;
$base-200: #BFCEEE;
$base-300: #92AADD;
$base-400: #6987C9;
$base-500: #4768AD;
$base-600: #3D5485;
$base-700: #303F5F;
$base-800: #232B3E;
$base-900: #171C26;
$base-hover: #213F7E;
$base-subtle: #BCC9E5;

{
    "color": {
        "base": {
            "value": "#2A4E9D",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F6FC",
                "type": "color"
            },
            "100": {
                "value": "#DEE6F7",
                "type": "color"
            },
            "200": {
                "value": "#BFCEEE",
                "type": "color"
            },
            "300": {
                "value": "#92AADD",
                "type": "color"
            },
            "400": {
                "value": "#6987C9",
                "type": "color"
            },
            "500": {
                "value": "#4768AD",
                "type": "color"
            },
            "600": {
                "value": "#3D5485",
                "type": "color"
            },
            "700": {
                "value": "#303F5F",
                "type": "color"
            },
            "800": {
                "value": "#232B3E",
                "type": "color"
            },
            "900": {
                "value": "#171C26",
                "type": "color"
            }
        }
    }
}