What color is #66538D?

#66538D is a medium, muted violet. In RGB it is rgb(102, 83, 141), and in HSL hsl(260, 26%, 44%).

Is #66538D accessible as text?

On white, #66538D has a contrast ratio of 6.59:1 (passes WCAG AA for body text); on black it is 3.19:1 (fails). For text placed on #66538D, use white for the best readability.

What is the closest Tailwind color to #66538D?

The nearest Tailwind CSS token is mauve-500 (#79697B).

What colors go well with #66538D?

#66538D pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #7A8D53. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #66538D below.

Is #66538D good for buttons?

#66538D works well for buttons and highlights, but use white text on #66538D — black text only reaches 3.19:1, below the 4.5:1 needed for normal-size labels.

Is #66538D the same as CSS darkslateblue?

No — #66538D is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#66538D Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #66538D

Not just a swatch — here's how #66538D works with other colors. Named schemes with #66538D in its natural role, and a note on why the supporting colors balance it.

Berry & Cream Lead · 5 colors

Lead #66538D Surface #F5E6D7 Anchor #5C2140 Accent #E5C2C7 Secondary #332B2F

Ultra Violet sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Coastal Morning Lead · 5 colors

Lead #66538D Accent #A5C4C4 Surface #E9D6BF Secondary #9AA0A1 Anchor #23334B

Ultra Violet 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 #66538D Secondary #7E4632 Surface #EDD8C2 Accent #355248 Anchor #582237

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.

Modern Café Dominant · 5 colors

Dominant #66538D Anchor #3B2923 Surface #F3E1D1 Accent #739F7E Secondary #3C3734

Ultra Violet 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 #66538D Secondary #8A849A Support #9C9088 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 #66538D 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 40/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

Softness 42/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 51/100

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 64/100

High

Faded, nostalgic quality — editorial, heritage and retro work.

Luxury 57/100

Moderate

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 88/100

Very high

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

Surface fit 25/100

Low

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

Print safety 88/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #66538D

For UI

For branding

For interior

For fashion

People also use #66538D with

Very Peri Plum Russian Green Gainsboro Onyx

UI roles & guardrails

Primary action Safe as a filled button with white label. AA

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 6.6:1. Use

Subtle surface Use #E1DDE8 for cards and hover fills. Tint 80

Avoid beside #7A538D — 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 #66538D 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: #66538D;
  --color-base-rgb: 102 83 141;
  --color-base-oklch: oklch(48.7% 0.093 298.0);
  --color-50: #F7F5FA;
  --color-100: #E9E5F0;
  --color-200: #D3CCE1;
  --color-300: #B2A7C8;
  --color-400: #9283AF;
  --color-500: #736491;
  --color-600: #5C5171;
  --color-700: #443D52;
  --color-800: #2E2A37;
  --color-900: #1D1B22;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  ultra-violet: {
    50: '#F7F5FA',
    100: '#E9E5F0',
    200: '#D3CCE1',
    300: '#B2A7C8',
    400: '#9283AF',
    500: '#736491',
    600: '#5C5171',
    700: '#443D52',
    800: '#2E2A37',
    900: '#1D1B22',
  },
}

$base: #66538D;
$base-ink: #FFFFFF;
$base-50: #F7F5FA;
$base-100: #E9E5F0;
$base-200: #D3CCE1;
$base-300: #B2A7C8;
$base-400: #9283AF;
$base-500: #736491;
$base-600: #5C5171;
$base-700: #443D52;
$base-800: #2E2A37;
$base-900: #1D1B22;
$base-hover: #524271;
$base-subtle: #D1CCDD;

{
    "color": {
        "base": {
            "value": "#66538D",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F7F5FA",
                "type": "color"
            },
            "100": {
                "value": "#E9E5F0",
                "type": "color"
            },
            "200": {
                "value": "#D3CCE1",
                "type": "color"
            },
            "300": {
                "value": "#B2A7C8",
                "type": "color"
            },
            "400": {
                "value": "#9283AF",
                "type": "color"
            },
            "500": {
                "value": "#736491",
                "type": "color"
            },
            "600": {
                "value": "#5C5171",
                "type": "color"
            },
            "700": {
                "value": "#443D52",
                "type": "color"
            },
            "800": {
                "value": "#2E2A37",
                "type": "color"
            },
            "900": {
                "value": "#1D1B22",
                "type": "color"
            }
        }
    }
}

Palettes built on #66538D

Color Lab

Pairs with #66538D

UI roles & guardrails

In real applications

Scales

Every model

Export