Weave your thoughts.
Notherion is a privacy-first knowledge base. Outline ideas as blocks, link everything together, and watch a personal knowledge graph grow — all stored on your own device.
A second brain that thinks in links
Every bullet is a first-class block you can reference, embed, and query anywhere. Your notes stay fluid instead of trapped in folders.
Knowledge graph
See your thinking as a living map — clusters reveal connections you never noticed.
Outliner blocks
Nested bullets that fold, zoom, and rearrange. Structure emerges as you think.
Bidirectional links
Type [[like this]]. Every page shows what references it — both ways.
Local-first & private
No accounts, no cloud lock-in. Your graph is plain files on your disk that work fully offline.
PDF & annotations
Highlight PDFs; every highlight becomes a linked block you can revisit forever.
Flashcards
Tag a block with #card — built-in spaced repetition schedules reviews right where you wrote them.
One tool for the whole thinking loop
Capture fast, connect ideas, organise automatically, and recall on demand — without ever leaving the app or the keyboard.
Daily journals
Every day opens to a fresh, dated page. Dump thoughts as bullets now and let structure catch up later — no “where should this go?” friction.
- Auto-dated journal, ready the moment you launch
- Move any block into a page whenever you want
- Scheduled & recurring notes with deadlines
Live queries
Ask your graph a question and get an always-up-to-date answer. Collect every block by tag, page, property, or task state — the list maintains itself.
- Simple filters or powerful advanced queries
- Results update the instant you add a note
- Embed a query on any page or in the journal
Tasks & workflows
Turn any bullet into a task with a single keyword. Track state with NOW / LATER / DOING / DONE, add deadlines, and see everything due in one place.
- Keyboard-first task states and priorities
- Deadlines & scheduled dates on the journal
- Built-in pomodoro-style time tracking
Everything built in
No subscriptions, no add-ons required for the core experience — it all ships in the app.
Drop pages and blocks onto an infinite canvas and connect them visually.
Spaced-repetition review built right into your notes — no export needed.
Highlight PDFs; every highlight becomes a linked, referable block.
Reusable block templates to spin up meetings, reviews, and more.
Do anything from the keyboard — pages, actions, and settings in a keystroke.
Instant search across every block, page, and property in your graph.
Your notes are plain-text files you can read, edit, and back up anywhere.
Add structured metadata to any block, then query and filter by it.
Embed and reuse any block anywhere — edit once, update everywhere.
Focus into any bullet as its own page; collapse the rest of the outline.
Light, dark, and a full accent palette — plus community themes.
A marketplace of plugins to extend Notherion — or write your own.
Your data lives on your device
No cloud lock-in, no accounts required. Notherion stores everything as plain files and a local database you fully control.
- ✓ Local-first storage — works fully offline
- ✓ Open source under AGPL — audit every line
- ✓ Plain-text & open formats — never locked in
- ✓ Back up or version your graph with any tool
Download Notherion
Free, open source, and ready for your desktop.
↓ Download for Windows