Drop in any document — PDF, DOCX, HTML, plain text — and watch it turn into a structured, linked Markdown wiki. A desktop app that thinks with you, stores everything on your disk, and versions every change with Git (OPTIONAL).
A complete knowledge workflow — from raw dump to structured wiki to AI-powered reasoning — in one desktop app.
PDFs, DOCX, HTML, TXT, CSV, JSON — all converted to Markdown on upload. Duplicate detection built in.
Claude reads each new source and proposes entities, concepts, and syntheses as wiki pages with wikilinks.
Every extracted insight gets a sparring chat. Talk it out, then optionally save as a synthesis page.
Interactive force-directed visualization of every page and every wikilink. See your thinking take shape.
BM25-ranked retrieval with a persistent index, Claude streaming, and full source citations on every answer.
Mechanical repair plus AI-generated questions, gap analysis, and synthesis candidates to keep your wiki alive.
Dedicated queue for unreviewed, seed, and stale pages. Inline preview, frontmatter editor, and compound-loop protection — AI output never feeds back unchecked.
Side panel showing backlinks, frontmatter details, and quick actions for every wiki page. Understand connections at a glance.
Custom syntheses from your wiki with source readiness checks. Marp presentations render directly in the app as live slide decks.
Define voice, style, and positioning once — injected into every AI call so all output sounds like you.
Curated prompt modules (like marp-presentation) installable in one click. Extend with your own.
Hit Cmd+K to jump to any page, action, or setting. Keyboard-first navigation for power users.
Every upload, ingest, and output is committed automatically. Push, pull, and collaborate like with code. Browse change history in-app.
Keep work, research, and personal knowledge in separate vaults — all under one roof, one repo.
API keys and Git tokens stored via the OS keychain (Electron safeStorage). Never in plaintext.
No prompt engineering. No folder structure decisions. Just drop, review, build.
Drag a PDF, paste a URL, upload a folder of DOCX files. The converter handles format, the deduper handles duplicates.
The AI reads each source, extracts takeaways, and proposes wiki operations: create, update, or merge pages with proper wikilinks.
Walk through AI-generated pages in the review queue. Confirm, edit, or flag them. Only reviewed pages flow into outputs — compound-loop protection built in.
Ask questions with full source citations. Run the linter to spot gaps. Generate presentations, essays, or reports from your reviewed knowledge.
SecondBrain is local-first by design. Every page, every raw input, every generated output lives in a plain Markdown folder you control. The only network calls go to the Claude API, only when you trigger them.
safeStorage.Open source, typed end-to-end, and structured so every contribution is straightforward.