Best Substack Archive Search - Substack Post Indexer Alternatives in 2026

About Substack Archive Search - Substack Post Indexer

Substack Archive Search 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 a...