What color is #424B8D?

#424B8D is a medium blue-violet. In RGB it is rgb(66, 75, 141), and in HSL hsl(233, 36%, 41%).

Is #424B8D accessible as text?

On white, #424B8D has a contrast ratio of 8.01:1 (passes WCAG AA for body text); on black it is 2.62:1 (fails). For text placed on #424B8D, use white for the best readability.

What is the closest Tailwind color to #424B8D?

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

What colors go well with #424B8D?

#424B8D pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8E8543. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #424B8D below.

Is #424B8D good for buttons?

#424B8D works well for buttons and highlights, but use white text on #424B8D — black text only reaches 2.62:1, below the 4.5:1 needed for normal-size labels.

Is #424B8D the same as CSS darkslateblue?

No — #424B8D is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#424B8D Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #424B8D

Not just a swatch — here's how #424B8D works with other colors. Named schemes with #424B8D in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #424B8D Accent #A5C4C2 Surface #EAD5BF 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.

Vintage Leather Lead · 5 colors

Lead #424B8D Secondary #7F4534 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.

Modern Café Dominant · 5 colors

Dominant #424B8D Anchor #3B2924 Surface #F3E1D2 Accent #769F7B 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.

Berry & Cream Lead · 5 colors

Lead #424B8D 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 #424B8D Secondary #737991 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 #424B8D 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 27/100

Cool

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

Softness 37/100

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 49/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 63/100

High

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

Brand distinctiveness 29/100

Low

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

UI accent fit 83/100

Very high

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

Surface fit 24/100

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 #424B8D

For UI

For branding

For interior

For fashion

People also use #424B8D with

Air Force Blue Ultra Violet Olive Green 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 8.0:1. Use

Subtle surface Use #D9DBE9 for cards and hover fills. Tint 80

Avoid beside #53438E — 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 #424B8D 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: #424B8D;
  --color-base-rgb: 66 75 141;
  --color-base-oklch: oklch(43.9% 0.108 275.2);
  --color-50: #F4F5FA;
  --color-100: #E3E5F2;
  --color-200: #C8CBE5;
  --color-300: #A0A6CF;
  --color-400: #7B82B7;
  --color-500: #5B629A;
  --color-600: #4A5077;
  --color-700: #393C56;
  --color-800: #282A39;
  --color-900: #1A1B23;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F4F5FA',
    100: '#E3E5F2',
    200: '#C8CBE5',
    300: '#A0A6CF',
    400: '#7B82B7',
    500: '#5B629A',
    600: '#4A5077',
    700: '#393C56',
    800: '#282A39',
    900: '#1A1B23',
  },
}

$base: #424B8D;
$base-ink: #FFFFFF;
$base-50: #F4F5FA;
$base-100: #E3E5F2;
$base-200: #C8CBE5;
$base-300: #A0A6CF;
$base-400: #7B82B7;
$base-500: #5B629A;
$base-600: #4A5077;
$base-700: #393C56;
$base-800: #282A39;
$base-900: #1A1B23;
$base-hover: #363D72;
$base-subtle: #C6C8DE;

{
    "color": {
        "base": {
            "value": "#424B8D",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F5FA",
                "type": "color"
            },
            "100": {
                "value": "#E3E5F2",
                "type": "color"
            },
            "200": {
                "value": "#C8CBE5",
                "type": "color"
            },
            "300": {
                "value": "#A0A6CF",
                "type": "color"
            },
            "400": {
                "value": "#7B82B7",
                "type": "color"
            },
            "500": {
                "value": "#5B629A",
                "type": "color"
            },
            "600": {
                "value": "#4A5077",
                "type": "color"
            },
            "700": {
                "value": "#393C56",
                "type": "color"
            },
            "800": {
                "value": "#282A39",
                "type": "color"
            },
            "900": {
                "value": "#1A1B23",
                "type": "color"
            }
        }
    }
}