A living knowledge graph of everything you know.
Ingest notes, markdown, Obsidian vaults, transcripts. Nexus extracts entities into a temporal knowledge graph and answers grounded questions on top of it.
Six things Nexus does for you.
Drop your knowledge in, ask any question, get an answer grounded in the source — with citations.
Universal ingest
Markdown, PDFs, Obsidian vaults, Notion exports, meeting transcripts, web pages. Nexus parses, dedupes, and structures it all into one navigable substrate.
Entity extraction
People, organizations, concepts, decisions — Nexus extracts them automatically and links them to every place they appear.
Temporal validity
Bi-temporal graph — facts have validity ranges. Ask 'what did we know in March?' and get the answer as of that date.
Interactive canvas
Pan, zoom, expand. Watch the graph rebuild itself as new sources land. Save layouts as views you can share with your team.
Grounded chat
Ask Nexus anything. Answers cite specific entities, edges, and source documents — never hallucinated. Drill down to the source paragraph.
Insights view
Density curves, activity heatmaps, distribution bars across entities and time. Surface gaps and concentration in your knowledge.
Three steps from notes to navigable graph.
Drop your knowledge in
Upload an Obsidian vault, paste markdown, connect a Google Drive, or push transcripts via the API. Nexus dedupes and parses everything in the background.
Nexus builds the graph
Entities are extracted and linked. Relationships are inferred and scored. Every node carries a validity range so the graph evolves as your knowledge does.
Ask + navigate
Use grounded chat to ask anything; jump to the canvas to explore the graph; check the insights view for patterns. Every answer cites the source paragraph.
Where Nexus earns its keep.
- Researchers
A second brain that actually navigates.
- Ingest a decade of notes in minutes
- Find the meeting where you decided X
- See the through-line across topics
- Teams
Institutional memory, queryable.
- Onboarding context for every new hire
- What we knew, when we knew it
- No more 'did we already discuss this?'
- Founders
Make the graph in your head visible.
- Connect customer calls, journal entries, drafts
- Surface the patterns you missed
- Bring your team into your context faster
On-device first, cloud-augmented.
Local-first
Phase 0 runs entirely in your browser — extraction, graph, chat. Your raw notes never leave your machine.
LLM-agnostic
Bring your own API key (OpenAI, Anthropic) or run a local model via Ollama. We don't lock you in.
Citations by default
Every answer surfaces the source nodes + paragraphs. Click through to the original, no fishing through search results.
Frequently asked questions
Where do my notes live?
On your machine, in your browser's IndexedDB, until you choose to sync to the cloud. Phase 0 is fully local-first; cloud sync is opt-in and isolates each workspace.How does the temporal graph work?
Every fact has a `valid_from` and `valid_to` timestamp. As you add new notes, conflicting facts get a new validity range — old ones stay queryable. Ask 'as of date X' and Nexus answers from that snapshot.What sources can I ingest?
Plain markdown, PDF, DOCX, Obsidian vaults, Notion exports, meeting transcripts (Granola, Otter, Fathom), web URLs, and the Nexus API for anything custom.Can I export the graph?
Yes — full GraphML, JSON, and CSV. The structured exports make Nexus a great upstream layer for any downstream tool.Is this private?
Yes. Your notes are encrypted at rest, isolated to your workspace, and never used for training. Local-first means your raw inputs never leave your machine unless you opt in to cloud sync.