Substack Archive Explorer – Offline Search for Substack Newsletters

Search, filter, and browse any Substack archive locally. Build a private offline index with powerful full-text search.

Substack Archive Explorer lets you index, search, and browse entire Substack publications locally — with no backend and full privacy. Build your own offline, searchable archive of Substack posts and instantly find what you’re looking for. Whether you’re a researcher, writer, journalist, or power reader, this extension turns any Substack into a fast, personal knowledge base. 🔍 Powerful Local Search - Instantly search posts by title. - Sort and filter large archives with pagination - Jump directly to any post in the publication’s history Pro users can unlock full-text search across entire articles. 📂 Local Archive Indexing - Index thousands of Substack posts directly in your browser - Data is stored locally using IndexedDB Once indexed, your archive is available even offline. 💎 Deep Search (Pro) Upgrade to Pro to enable deep indexing, which downloads and indexes the full text of every post. - Search inside article content - Find exact phrases, topics, and references - Ideal for long-running newsletters and research-heavy publications 🔒 Privacy-First by Design - All data stays on your device - No cloud storage -No tracking - No data resale Your reading history and indexed content are never uploaded anywhere. ⚡ Fast & Efficient - Optimized local indexing and search - Built for large archives - Faster than Substack’s built-in search 🎯 Perfect For - Researchers exploring long-running Substack archives - Writers collecting references and inspiration - Newsletter readers managing multiple subscriptions - Anyone who wants fast, offline access to Substack content 🛠️ How It Works - Visit any Substack publication (including custom domains) - Open Substack Archive Explorer - Index the archive (shallow or deep) - Search and browse instantly 🆓 Free vs Pro Free includes: - Shallow indexing (titles) - Local archive browsing - Basic search and sorting Pro unlocks: - Deep indexing with full-text search - Unlimited indexing - Advanced controls Stop scrolling endlessly through old posts. Explore Substack archives the smart way: locally, privately, and fast. Extension contains links to other useful free tools from the developer.