Search, filter, and browse any Substack archive locally. Build a private offline index with powerful full-text search. Substack Archive Explorer 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.