A notebook as rich
as your ideas.
Plain .md and .html files on your own disk — no account, no lock-in. Calm text when you want it; a real table, diagram, or living chart when an idea needs more.
Free & open source · macOS, Windows & Linux · your files never leave your disk
rich note · growth.html
Notes added each week
Six weeks in, the habit is compounding. The chart below is drawn from numbers right in the note — none of it can live in a plain-text file.
Plays well with everything you already use
Three steps. Then it's just writing.
There's no onboarding wizard and no settings to wire up. The whole product is a folder, a few good ideas about links, and an open door for your agent.
Open a folder
Point Folio at any folder — or make a new one. Every note becomes a plain .md or .html file inside it. No account, no import, nothing to sync.
Write, and link
Type. Link one note to another with a normal relative link. Backlinks, a full-text index, and a navigable graph build themselves as you go.
Point your agent at it
Run a coding agent like Claude Code in the same folder. It reads and writes the exact same notes you do — no API key, no plugin, no setup.
It’s just a folder on your computer.
Your whole notebook is one folder of files, right where you can see them in Finder or Explorer. Because it’s just files, your AI agent can work the same folder — point Claude Code at it and it reads and writes your notes directly.
- Back it up by copying the folder. Take it anywhere.
- Open it in this app, your editor, or anything else.
- The app and the agent are two programs on one folder.
A calm writing app with a serious engine underneath.
Everything here follows your files. Nothing to maintain, nothing to configure — it's all just there, the moment you start writing.
Local files, no lock-in
Every note is a plain .md or .html file in one folder. Yours forever — copy it, sync it, version it with git, take it anywhere.
Plain → rich, automatically
Markdown by default. The moment a note needs a table, diagram, or chart, it just becomes HTML — no setting to flip.
Links, backlinks & a graph
Relative links build a navigable map and backlinks for free — they simply follow the links you write.
Built for your agent
An Agent panel surfaces the files that shape behavior — CLAUDE.md, AGENTS.md, writing-guide.md — to see and edit in one place.
Per-note history
Every change is recorded. Diff and revert any note, and see what you changed versus what your agent did.
Full-text search
Find any note instantly — plain or rich, body and titles. No index to maintain; it follows your files.
You never choose a format. A note becomes as rich as its content needs.
That last row is the real difference. As AI agents grow more capable, the tables, typed data, and diagrams in a note become something they can reason over, not just read.
Connecting an agent is just pointing it at the folder.
No API key to paste in, no plugin to install, no service to sign into. A coding agent like Claude Code already knows how to read and write files. Run it in the same folder as your notes, and now it can:
- Read any note to answer a question or pull context.
- Write a new note, or edit and restructure an existing one.
- Tidy links, summarize a cluster, or draft from scattered thoughts.
A single note is useful. A web of them earns its keep.
A link is just a normal relative link to another note. Make one and three quiet things happen at once: it becomes a path you can follow, an edge in the graph, and a backlink on the note you pointed at — so that note knows what mentions it.
Your notes, on your disk, ready for your agent.
Free and open source. Download it, open a folder, and start writing — nothing to sign up for.
View the project on GitHub