Substack Archive Search - Offline Post Indexer

Substack Archive Search is the ultimate discovery tool for power users. It builds a local, searchable index of any publication, allowing you to bypass Substack's limited native search and find exactly what you need in seconds.

Note: This extension is a search and discovery tool. It indexes archives to help you find posts; clicking a result will take you to the post on Substack.com to read.

🔍 Advanced Substack Search Engine. Native search can be slow and often misses older content. This extension creates a high-speed local database of a publication’s history.

Instant Filtering: Sort by date, title, or relevance.

Deep Indexing (Pro): Search the full-text content of every article, not just the headlines.

📂 Build a Personal Research Knowledge Base Perfect for journalists, academics, and researchers who need to track a writer’s specific mentions of topics over time.

Metadata Indexing: Automatically captures author names, tweet-IDs, and publication dates.

Offline Access: Browse your indexed search results even when you don’t have an internet connection.

🔒 Privacy-First Indexing Unlike web-based search tools, all indexing happens locally.

No data is sent to a backend.

Your search history stays on your machine.

Compatible with custom Substack domains.

⚡ Optimized for Performance Built using IndexedDB, this extension can handle archives with thousands of posts without slowing down your browser. It’s the fastest way to turn a newsletter archive into a searchable library.