What color is #643F71?

#643F71 is a dark, muted purple. In RGB it is rgb(100, 63, 113), and in HSL hsl(284, 28%, 35%).

Is #643F71 accessible as text?

On white, #643F71 has a contrast ratio of 8.43:1 (passes WCAG AA for body text); on black it is 2.49:1 (fails). For text placed on #643F71, use white for the best readability.

What is the closest Tailwind color to #643F71?

The nearest Tailwind CSS token is mauve-600 (#594C5B).

What colors go well with #643F71?

#643F71 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #4E7240. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #643F71 below.

Is #643F71 good for buttons?

#643F71 works well for buttons and highlights, but use white text on #643F71 — black text only reaches 2.49:1, below the 4.5:1 needed for normal-size labels.

Is #643F71 the same as CSS darkslateblue?

No — #643F71 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.

#643F71 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #643F71

Not just a swatch — here's how #643F71 works with other colors. Named schemes with #643F71 in its natural role, and a note on why the supporting colors balance it.

Berry & Cream Lead · 5 colors

Lead #643F71 Surface #F5E6D7 Anchor #5D203E Accent #E5C2C6 Secondary #332B2F

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

Vintage Leather Lead · 5 colors

Lead #643F71 Secondary #7E462F Surface #ECD8C1 Accent #345249 Anchor #592235

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 #643F71 Anchor #3B2922 Surface #F2E2D1 Accent #9E9362 Secondary #3C3733

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.

Japanese Sand Base · 5 colors

Base #643F71 Surface #F1E8DC Highlight #F7F0E7 Secondary #BDADA1 Ink #2C2723

Ultra Violet sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #643F71 Secondary #807285 Support #9C9087 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 #643F71 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 49/100

Neutral

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

Softness 38/100

Low

Middle-weight — neither delicate nor heavy.

Depth 56/100

Moderate

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

Naturalness 1/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 64/100

High

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

Luxury 62/100

High

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 76/100

High

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

Surface fit 29/100

Low

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

Print safety 90/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #643F71

For UI

For branding

For interior

For fashion

People also use #643F71 with

Ultra Violet Eggplant Fern 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 8.4:1. Use

Subtle surface Use #E1D7E5 for cards and hover fills. Tint 80

Avoid beside #72406F — 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 #643F71 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: #643F71;
  --color-base-rgb: 100 63 113;
  --color-base-oklch: oklch(43.1% 0.091 316.9);
  --color-50: #F8F5FA;
  --color-100: #EDE5F1;
  --color-200: #DCCBE2;
  --color-300: #C0A6CA;
  --color-400: #A482B0;
  --color-500: #866293;
  --color-600: #694F72;
  --color-700: #4D3C53;
  --color-800: #342A37;
  --color-900: #201B22;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  ultra-violet: {
    50: '#F8F5FA',
    100: '#EDE5F1',
    200: '#DCCBE2',
    300: '#C0A6CA',
    400: '#A482B0',
    500: '#866293',
    600: '#694F72',
    700: '#4D3C53',
    800: '#342A37',
    900: '#201B22',
  },
}

$base: #643F71;
$base-ink: #FFFFFF;
$base-50: #F8F5FA;
$base-100: #EDE5F1;
$base-200: #DCCBE2;
$base-300: #C0A6CA;
$base-400: #A482B0;
$base-500: #866293;
$base-600: #694F72;
$base-700: #4D3C53;
$base-800: #342A37;
$base-900: #201B22;
$base-hover: #51335B;
$base-subtle: #D2C3D8;

{
    "color": {
        "base": {
            "value": "#643F71",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F8F5FA",
                "type": "color"
            },
            "100": {
                "value": "#EDE5F1",
                "type": "color"
            },
            "200": {
                "value": "#DCCBE2",
                "type": "color"
            },
            "300": {
                "value": "#C0A6CA",
                "type": "color"
            },
            "400": {
                "value": "#A482B0",
                "type": "color"
            },
            "500": {
                "value": "#866293",
                "type": "color"
            },
            "600": {
                "value": "#694F72",
                "type": "color"
            },
            "700": {
                "value": "#4D3C53",
                "type": "color"
            },
            "800": {
                "value": "#342A37",
                "type": "color"
            },
            "900": {
                "value": "#201B22",
                "type": "color"
            }
        }
    }
}

Palettes built on #643F71

Color Lab

Pairs with #643F71

UI roles & guardrails

In real applications

Scales

Every model

Export