Substack Archive Search - Substack Post Indexer

Search any Substack archive instantly. Build a private, offline index to find posts by title or full-text

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 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, quotes, and research inspiration - Knowledge workers building local archives for Obsidian, Notion, or personal Markdown vaults - Newsletter readers managing multiple subscriptions - Anyone who wants fast, offline access to Substack content 📊 Capability Comparison - Search Scope: Complete local archive (Public & Paid) vs Public global query only - Full-Text Deep Search: High-speed client-side indexing (IndexedDB) vs Limited snippet matching - Offline Access: ✅ 100% Offline Accessible vs ❌ None - Data Privacy: 🛡️ 100% Client-Side / Zero Data Leakage vs Server-logged telemetry - Query Latency: ⚡ Instant (< 15ms local search) vs 1.5s – 3.0s API latency 🛠️ How It Works - Visit any Substack publication (including custom domains) - Open Substack Archive Search - Index the archive (shallow or deep) - Search and browse instantly 🆓 Free vs Pro Free includes: - Shallow indexing (titles & metadata) - Local archive browsing - Basic search and sorting Pro unlocks: - Deep indexing with full-text content search - Unlimited publication indexing - Advanced controls and export preparation ❓ Frequently Asked Questions Q: Can I search paid or subscriber-only Substack posts? A: Yes! As long as you are logged into your Substack account in your browser, the extension indexes paid posts you have authorized access to. Q: Does Substack Archive Search work offline? A: Yes. All indexed post titles, metadata, and full-text issue bodies are stored locally in your browser's IndexedDB, allowing complete offline search. Q: How does Substack Archive Search compare to native search? A: Native Substack search is cloud-dependent, takes 1.5s–3.0s, and only matches surface snippets. Substack Archive Search provides instant sub-15ms client-side full-text search across entire issues with 100% privacy. Q: Can I use this for Obsidian, Notion, or personal Markdown vaults? A: Yes. It provides instant reference discovery for quickly citing quotes, data points, and technical arguments in your knowledge bases. 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.