What color is #404178?

#404178 is a dark, muted blue-violet. In RGB it is rgb(64, 65, 120), and in HSL hsl(239, 30%, 36%).

Is #404178 accessible as text?

On white, #404178 has a contrast ratio of 9.35:1 (passes WCAG AA for body text); on black it is 2.25:1 (fails). For text placed on #404178, use white for the best readability.

What is the closest Tailwind color to #404178?

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

What colors go well with #404178?

#404178 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #777640. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #404178 below.

Is #404178 good for buttons?

#404178 works well for buttons and highlights, but use white text on #404178 — black text only reaches 2.25:1, below the 4.5:1 needed for normal-size labels.

Is #404178 the same as CSS darkslateblue?

No — #404178 is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#404178 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #404178

Not just a swatch — here's how #404178 works with other colors. Named schemes with #404178 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #404178 Accent #A5C4C3 Surface #EAD5BF Secondary #9AA0A1 Anchor #22334A

Dark Slate 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 #404178 Secondary #AEB4B8 Surface #F1F2F0 Support #7E92A7 Anchor #2E3236

Dark Slate Blue keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Vintage Leather Lead · 5 colors

Lead #404178 Secondary #7F4534 Surface #EDD7C2 Accent #365247 Anchor #582238

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.

Modern Café Dominant · 5 colors

Dominant #404178 Anchor #3B2923 Surface #F3E1D2 Accent #759F7B Secondary #3C3734

Dark Slate Blue anchors this café scheme as the warm mid-tone, lifted by latte cream and a muted sage accent and grounded by espresso brown and a warm charcoal.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #404178 Secondary #6B6E82 Support #9D9088 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 #404178 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 33/100

Cool

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

Softness 36/100

Low

Middle-weight — neither delicate nor heavy.

Depth 59/100

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 52/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 65/100

High

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

Brand distinctiveness 25/100

Low

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

UI accent fit 68/100

High

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

Surface fit 31/100

Low

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 #404178

For UI

For branding

For interior

For fashion

People also use #404178 with

Teal Blue Ultra Violet Olive Brown Gainsboro Prussian Blue

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 9.4:1. Use

Subtle surface Use #D7D8E5 for cards and hover fills. Tint 80

Avoid beside #524077 — 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 #404178 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: #404178;
  --color-base-rgb: 64 65 120;
  --color-base-oklch: oklch(40.2% 0.091 280.7);
  --color-50: #F5F5FA;
  --color-100: #E4E4F1;
  --color-200: #CACAE2;
  --color-300: #A4A5CB;
  --color-400: #8081B2;
  --color-500: #606195;
  --color-600: #4E4F74;
  --color-700: #3B3C54;
  --color-800: #292938;
  --color-900: #1B1B23;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F5F5FA',
    100: '#E4E4F1',
    200: '#CACAE2',
    300: '#A4A5CB',
    400: '#8081B2',
    500: '#606195',
    600: '#4E4F74',
    700: '#3B3C54',
    800: '#292938',
    900: '#1B1B23',
  },
}

$base: #404178;
$base-ink: #FFFFFF;
$base-50: #F5F5FA;
$base-100: #E4E4F1;
$base-200: #CACAE2;
$base-300: #A4A5CB;
$base-400: #8081B2;
$base-500: #606195;
$base-600: #4E4F74;
$base-700: #3B3C54;
$base-800: #292938;
$base-900: #1B1B23;
$base-hover: #33345F;
$base-subtle: #C3C3D9;

{
    "color": {
        "base": {
            "value": "#404178",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F5FA",
                "type": "color"
            },
            "100": {
                "value": "#E4E4F1",
                "type": "color"
            },
            "200": {
                "value": "#CACAE2",
                "type": "color"
            },
            "300": {
                "value": "#A4A5CB",
                "type": "color"
            },
            "400": {
                "value": "#8081B2",
                "type": "color"
            },
            "500": {
                "value": "#606195",
                "type": "color"
            },
            "600": {
                "value": "#4E4F74",
                "type": "color"
            },
            "700": {
                "value": "#3B3C54",
                "type": "color"
            },
            "800": {
                "value": "#292938",
                "type": "color"
            },
            "900": {
                "value": "#1B1B23",
                "type": "color"
            }
        }
    }
}