SecondBrain turns Claude Code into a private, sourced wiki: drop in a PDF, a web page, or a note, let it organize everything into cross-linked articles, then ask questions and get answers with citations. Stays on your machine. macOS app included.
- SecondBrain is an open-source macOS tool that uses Claude Code (or Codex/OpenCode) to turn documents, PDFs, web pages, and notes into a local, cross-linked wiki with cited answers to natural-language questions.
- Everything stays on your machine. the only data leaving is the text sent to the underlying model for processing, and the .env config file is gitignored by design.
- For journalists building personal research archives, the lint feature that flags contradictions and gaps in your own knowledge base is the most practical differentiator from a simple RAG setup.
