What color is #42406E?

#42406E is a dark, muted blue-violet. In RGB it is rgb(66, 64, 110), and in HSL hsl(243, 26%, 34%).

Is #42406E accessible as text?

On white, #42406E has a contrast ratio of 9.59:1 (passes WCAG AA for body text); on black it is 2.19:1 (fails). For text placed on #42406E, use white for the best readability.

What is the closest Tailwind color to #42406E?

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

What colors go well with #42406E?

#42406E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #6B6D40. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #42406E below.

Is #42406E good for buttons?

#42406E works well for buttons and highlights, but use white text on #42406E — black text only reaches 2.19:1, below the 4.5:1 needed for normal-size labels.

Is #42406E the same as CSS darkslateblue?

No — #42406E is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#42406E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #42406E

Not just a swatch — here's how #42406E works with other colors. Named schemes with #42406E in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #42406E 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 #42406E 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 #42406E Secondary #7E4533 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 #42406E Anchor #3B2923 Surface #F3E1D2 Accent #759F7C 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 #42406E Secondary #6B6C7D 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 #42406E 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 37/100

Cool

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

Softness 37/100

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 49/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 64/100

High

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

Brand distinctiveness 21/100

Low

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

UI accent fit 62/100

High

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

Surface fit 36/100

Low

Usable as a tinted surface in measured doses.

Print safety 89/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #42406E

For UI

For branding

For interior

For fashion

People also use #42406E with

Teal Blue Eggplant Dark Olive Green 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 9.6:1. Use

Subtle surface Use #D8D7E4 for cards and hover fills. Tint 80

Avoid beside #51406D — 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 #42406E 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: #42406E;
  --color-base-rgb: 66 64 110;
  --color-base-oklch: oklch(39.6% 0.077 284.3);
  --color-50: #F5F5FA;
  --color-100: #E6E5F0;
  --color-200: #CDCCE1;
  --color-300: #A8A7C8;
  --color-400: #8683AF;
  --color-500: #666491;
  --color-600: #525171;
  --color-700: #3E3D52;
  --color-800: #2B2A37;
  --color-900: #1B1B22;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F5F5FA',
    100: '#E6E5F0',
    200: '#CDCCE1',
    300: '#A8A7C8',
    400: '#8683AF',
    500: '#666491',
    600: '#525171',
    700: '#3E3D52',
    800: '#2B2A37',
    900: '#1B1B22',
  },
}

$base: #42406E;
$base-ink: #FFFFFF;
$base-50: #F5F5FA;
$base-100: #E6E5F0;
$base-200: #CDCCE1;
$base-300: #A8A7C8;
$base-400: #8683AF;
$base-500: #666491;
$base-600: #525171;
$base-700: #3E3D52;
$base-800: #2B2A37;
$base-900: #1B1B22;
$base-hover: #353357;
$base-subtle: #C4C3D6;

{
    "color": {
        "base": {
            "value": "#42406E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F5FA",
                "type": "color"
            },
            "100": {
                "value": "#E6E5F0",
                "type": "color"
            },
            "200": {
                "value": "#CDCCE1",
                "type": "color"
            },
            "300": {
                "value": "#A8A7C8",
                "type": "color"
            },
            "400": {
                "value": "#8683AF",
                "type": "color"
            },
            "500": {
                "value": "#666491",
                "type": "color"
            },
            "600": {
                "value": "#525171",
                "type": "color"
            },
            "700": {
                "value": "#3E3D52",
                "type": "color"
            },
            "800": {
                "value": "#2B2A37",
                "type": "color"
            },
            "900": {
                "value": "#1B1B22",
                "type": "color"
            }
        }
    }
}