Substack Archive Explorer – Offline search and local indexing for Substack newsletters

Summary: Substack Archive Explorer enables building a private offline index of Substack newsletters with full-text search and browsing capabilities. It works without a backend, allowing users to quickly find posts within entire Substack archives locally while maintaining privacy.

What it does

The tool indexes and lets users search and filter complete Substack publications offline. It creates a local, searchable archive of posts accessible through a browser extension.

Who it's for

Researchers, writers, journalists, and power readers who need efficient access to large Substack archives.

Why it matters

It solves the difficulty of navigating large Substack archives by providing fast, private, offline search and retrieval of older content.