I built a 100% private WhatsApp chat analyzer (Zero servers, zero tracking)

Most chat analysis tools ask you to upload private conversation archives to a remote server.

Even if the site claims "we delete logs immediately," handing unencrypted personal chats to an unfamiliar API is a major privacy compromise.

I built PurpleChats to solve this with one rule: zero backend.

Every calculation—from unzipping .zip exports to generating interactive Spotify Wrapped-style cards—runs strictly in the user's browser.

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What It Does

• 🎁 WhatsApp Wrapped Mode: 3D interactive story cards showing chat streaks, late-night chatter, and response time percentiles.
• 📊 Group Dynamics: Response latency rankings, conversation starter badges, and interactive interaction graphs.
• 🔒 100% Client-Side Privacy: No databases, no telemetry, and zero network calls. When you close the tab, the data is gone.

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How It Works Under the Hood

Parsing tens of thousands of messages on the main browser thread causes frame drops.

To keep the UI running at a clean 60fps:

1. In-Memory Unzipping: Uses fflate to unpack .zip archives directly into RAM without saving temporary files.
2. Web Workers: All regex matching, date normalization, and metric calculations run in a background worker. A 30,000-message chat processes in under 180ms.
3. Canvas Card Export: Uses html-to-image to let users export shareable metric cards as PNGs directly from the DOM.

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Tech Stack

• Framework: React 18 + TypeScript + Vite
• Styling: Tailwind CSS (editorial warm-paper design)
• Processing: Web Workers + fflate
• Hosting: Cloudflare Pages (free static CDN)

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Try It Out

• 🌐 Live App: https://purplechats.pages.dev
• 💻 GitHub: https://github.com/Rahmman001/PurpleChats

The project is fully open source under the MIT license. Feedback and contributions are welcome!