What color is #404D8A?

#404D8A is a medium blue-violet. In RGB it is rgb(64, 77, 138), and in HSL hsl(229, 37%, 40%).

Is #404D8A accessible as text?

On white, #404D8A has a contrast ratio of 7.93:1 (passes WCAG AA for body text); on black it is 2.65:1 (fails). For text placed on #404D8A, use white for the best readability.

What is the closest Tailwind color to #404D8A?

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

What colors go well with #404D8A?

#404D8A pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8C7E40. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #404D8A below.

Is #404D8A good for buttons?

#404D8A works well for buttons and highlights, but use white text on #404D8A — black text only reaches 2.65:1, below the 4.5:1 needed for normal-size labels.

Is #404D8A the same as CSS darkslateblue?

No — #404D8A is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#404D8A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #404D8A

Not just a swatch — here's how #404D8A works with other colors. Named schemes with #404D8A in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #404D8A Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Dark Slate 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 #404D8A Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #6271AA

Dark Slate 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 Dark Slate Blue.

Vintage Leather Lead · 5 colors

Lead #404D8A Secondary #7F4535 Surface #EED7C2 Accent #365247 Anchor #582239

Dark Slate 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 #404D8A Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Dark Slate 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 #404D8A Secondary #737990 Support #9D8F88 Ink #18140F

Dark Slate 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 Dark Slate Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #404D8A 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 28/100

Cool

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

Softness 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 56/100

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 51/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 62/100

High

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

Brand distinctiveness 27/100

Low

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

UI accent fit 82/100

Very high

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

Surface fit 26/100

Low

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

Print safety 83/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #404D8A

For UI

For branding

For interior

For fashion

People also use #404D8A with

Air Force Blue Ultra Violet Olive Brown Gainsboro Gunmetal 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 7.9:1. Use

Subtle surface Use #D8DBE9 for cards and hover fills. Tint 80

Avoid beside #4C408C — 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 #404D8A 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: #404D8A;
  --color-base-rgb: 64 77 138;
  --color-base-oklch: oklch(44.0% 0.101 272.5);
  --color-50: #F4F5FA;
  --color-100: #E3E6F3;
  --color-200: #C7CDE5;
  --color-300: #A0A8CF;
  --color-400: #7A86B8;
  --color-500: #5A669B;
  --color-600: #4A5278;
  --color-700: #383E56;
  --color-800: #282B39;
  --color-900: #1A1B24;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F4F5FA',
    100: '#E3E6F3',
    200: '#C7CDE5',
    300: '#A0A8CF',
    400: '#7A86B8',
    500: '#5A669B',
    600: '#4A5278',
    700: '#383E56',
    800: '#282B39',
    900: '#1A1B24',
  },
}

$base: #404D8A;
$base-ink: #FFFFFF;
$base-50: #F4F5FA;
$base-100: #E3E6F3;
$base-200: #C7CDE5;
$base-300: #A0A8CF;
$base-400: #7A86B8;
$base-500: #5A669B;
$base-600: #4A5278;
$base-700: #383E56;
$base-800: #282B39;
$base-900: #1A1B24;
$base-hover: #333E70;
$base-subtle: #C4C9DE;

{
    "color": {
        "base": {
            "value": "#404D8A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F5FA",
                "type": "color"
            },
            "100": {
                "value": "#E3E6F3",
                "type": "color"
            },
            "200": {
                "value": "#C7CDE5",
                "type": "color"
            },
            "300": {
                "value": "#A0A8CF",
                "type": "color"
            },
            "400": {
                "value": "#7A86B8",
                "type": "color"
            },
            "500": {
                "value": "#5A669B",
                "type": "color"
            },
            "600": {
                "value": "#4A5278",
                "type": "color"
            },
            "700": {
                "value": "#383E56",
                "type": "color"
            },
            "800": {
                "value": "#282B39",
                "type": "color"
            },
            "900": {
                "value": "#1A1B24",
                "type": "color"
            }
        }
    }
}