What color is #42547D?

#42547D is a dark, muted blue. In RGB it is rgb(66, 84, 125), and in HSL hsl(222, 31%, 37%).

Is #42547D accessible as text?

On white, #42547D has a contrast ratio of 7.51:1 (passes WCAG AA for body text); on black it is 2.80:1 (fails). For text placed on #42547D, use white for the best readability.

What is the closest Tailwind color to #42547D?

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

What colors go well with #42547D?

#42547D pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #7C6A41. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #42547D below.

Is #42547D good for buttons?

#42547D works well for buttons and highlights, but use white text on #42547D — black text only reaches 2.80:1, below the 4.5:1 needed for normal-size labels.

Is #42547D the same as CSS darkslateblue?

No — #42547D is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#42547D Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #42547D

Not just a swatch — here's how #42547D works with other colors. Named schemes with #42547D in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #42547D Accent #A5C4C2 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

Ultra Violet 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 #42547D Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A7 Anchor #2E3236

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

Tech Product Signal · 5 colors

Signal #42547D Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #65779E

Ultra Violet is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Ultra Violet.

Vintage Leather Lead · 5 colors

Lead #42547D Secondary #7F4536 Surface #EED7C2 Accent #365246 Anchor #58223A

Ultra Violet plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #42547D Secondary #767D8C Support #9D8F88 Ink #18140F

Ultra Violet 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 Ultra Violet carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #42547D 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 42/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 54/100

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 59/100

Moderate

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

Brand distinctiveness 19/100

Very low

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

UI accent fit 74/100

High

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

Surface fit 34/100

Low

Usable as a tinted surface in measured doses.

Print safety 87/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #42547D

For UI

For branding

For interior

For fashion

People also use #42547D with

Air Force Blue Dark Slate Blue Raw Umber 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 7.5:1. Use

Subtle surface Use #D8DCE6 for cards and hover fills. Tint 80

Avoid beside #43417C — 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 #42547D 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: #42547D;
  --color-base-rgb: 66 84 125;
  --color-base-oklch: oklch(44.9% 0.071 265.5);
  --color-50: #F5F6FA;
  --color-100: #E4E8F1;
  --color-200: #CAD1E3;
  --color-300: #A4B0CC;
  --color-400: #7F8FB3;
  --color-500: #5F6F96;
  --color-600: #4E5974;
  --color-700: #3B4254;
  --color-800: #292D38;
  --color-900: #1A1D23;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  ultra-violet: {
    50: '#F5F6FA',
    100: '#E4E8F1',
    200: '#CAD1E3',
    300: '#A4B0CC',
    400: '#7F8FB3',
    500: '#5F6F96',
    600: '#4E5974',
    700: '#3B4254',
    800: '#292D38',
    900: '#1A1D23',
  },
}

$base: #42547D;
$base-ink: #FFFFFF;
$base-50: #F5F6FA;
$base-100: #E4E8F1;
$base-200: #CAD1E3;
$base-300: #A4B0CC;
$base-400: #7F8FB3;
$base-500: #5F6F96;
$base-600: #4E5974;
$base-700: #3B4254;
$base-800: #292D38;
$base-900: #1A1D23;
$base-hover: #344263;
$base-subtle: #C3CADA;

{
    "color": {
        "base": {
            "value": "#42547D",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F6FA",
                "type": "color"
            },
            "100": {
                "value": "#E4E8F1",
                "type": "color"
            },
            "200": {
                "value": "#CAD1E3",
                "type": "color"
            },
            "300": {
                "value": "#A4B0CC",
                "type": "color"
            },
            "400": {
                "value": "#7F8FB3",
                "type": "color"
            },
            "500": {
                "value": "#5F6F96",
                "type": "color"
            },
            "600": {
                "value": "#4E5974",
                "type": "color"
            },
            "700": {
                "value": "#3B4254",
                "type": "color"
            },
            "800": {
                "value": "#292D38",
                "type": "color"
            },
            "900": {
                "value": "#1A1D23",
                "type": "color"
            }
        }
    }
}

Palettes built on #42547D

Color Lab

Pairs with #42547D

UI roles & guardrails

In real applications

Scales

Every model

Export