What color is #66366B?

#66366B is a dark, muted purple. In RGB it is rgb(102, 54, 107), and in HSL hsl(294, 33%, 32%).

Is #66366B accessible as text?

On white, #66366B has a contrast ratio of 9.11:1 (passes WCAG AA for body text); on black it is 2.30:1 (fails). For text placed on #66366B, use white for the best readability.

What is the closest Tailwind color to #66366B?

The nearest Tailwind CSS token is fuchsia-900 (#721378).

What colors go well with #66366B?

#66366B pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #3C6D37. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #66366B below.

Is #66366B good for buttons?

#66366B works well for buttons and highlights, but use white text on #66366B — black text only reaches 2.30:1, below the 4.5:1 needed for normal-size labels.

Is #66366B the same as CSS darkslateblue?

No — #66366B 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.

#66366B Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #66366B

Not just a swatch — here's how #66366B works with other colors. Named schemes with #66366B in its natural role, and a note on why the supporting colors balance it.

Berry & Cream Lead · 5 colors

Lead #66366B Surface #F5E6D7 Anchor #5D203E Accent #E6C2C6 Secondary #332B2E

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

Vintage Leather Lead · 5 colors

Lead #66366B Secondary #7E472F Surface #ECD8C1 Accent #345249 Anchor #592234

Byzantium 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 #66366B Anchor #3B2922 Surface #F2E2D1 Accent #9E9362 Secondary #3C3733

Byzantium 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 #66366B Secondary #7E6C7F Support #9C9087 Ink #18140F

Byzantium 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 Byzantium carrying the quiet middle.

Tech Product Signal · 5 colors

Signal #66366B Surface #14161A Highlight #F4F6F8 Secondary #5C6573 Accent #875A8C

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

Build a working theme in the generator →

Color Lab

How #66366B 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 52/100

Neutral

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

Softness 36/100

Low

Middle-weight — neither delicate nor heavy.

Depth 58/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 2/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 60/100

High

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

Luxury 64/100

High

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

Brand distinctiveness 28/100

Low

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

UI accent fit 75/100

High

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

Surface fit 27/100

Low

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

Print safety 89/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #66366B

For UI

For branding

For interior

For fashion

People also use #66366B with

Ultra Violet Eggplant Dark Olive Green Gainsboro

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 9.1:1. Use

Subtle surface Use #E3D4E5 for cards and hover fills. Tint 80

Avoid beside #6D3760 — 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 #66366B 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: #66366B;
  --color-base-rgb: 102 54 107;
  --color-base-oklch: oklch(41.5% 0.102 323.7);
  --color-50: #FAF5FA;
  --color-100: #F0E3F2;
  --color-200: #E1C9E4;
  --color-300: #C9A2CD;
  --color-400: #AF7EB4;
  --color-500: #925D97;
  --color-600: #714C75;
  --color-700: #523A55;
  --color-800: #372938;
  --color-900: #221A23;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  byzantium: {
    50: '#FAF5FA',
    100: '#F0E3F2',
    200: '#E1C9E4',
    300: '#C9A2CD',
    400: '#AF7EB4',
    500: '#925D97',
    600: '#714C75',
    700: '#523A55',
    800: '#372938',
    900: '#221A23',
  },
}

$base: #66366B;
$base-ink: #FFFFFF;
$base-50: #FAF5FA;
$base-100: #F0E3F2;
$base-200: #E1C9E4;
$base-300: #C9A2CD;
$base-400: #AF7EB4;
$base-500: #925D97;
$base-600: #714C75;
$base-700: #523A55;
$base-800: #372938;
$base-900: #221A23;
$base-hover: #532C57;
$base-subtle: #D5BED8;

{
    "color": {
        "base": {
            "value": "#66366B",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#FAF5FA",
                "type": "color"
            },
            "100": {
                "value": "#F0E3F2",
                "type": "color"
            },
            "200": {
                "value": "#E1C9E4",
                "type": "color"
            },
            "300": {
                "value": "#C9A2CD",
                "type": "color"
            },
            "400": {
                "value": "#AF7EB4",
                "type": "color"
            },
            "500": {
                "value": "#925D97",
                "type": "color"
            },
            "600": {
                "value": "#714C75",
                "type": "color"
            },
            "700": {
                "value": "#523A55",
                "type": "color"
            },
            "800": {
                "value": "#372938",
                "type": "color"
            },
            "900": {
                "value": "#221A23",
                "type": "color"
            }
        }
    }
}

Palettes built on #66366B

Color Lab

Pairs with #66366B

UI roles & guardrails

In real applications

Scales

Every model

Export