Substack Archive Search - Substack Post Indexer by Neo Cortex

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 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 Search
- 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.