I built Ferrow: a local-first Markdown vault where every AI edit is undoable

Chris Ruzylo — Mon, 17 Aug 2026 14:40:45 +0000

I kept hitting the same wall with AI note tools: I want the help, but I don't want my notes living in someone else's database, and I don't want an agent rewriting things I can't get back.

So I built Ferrow — a local-first Markdown vault with reversible AI agents.

How it works:

Your notes are plain .md files on your disk. No proprietary format, no lock-in — point any other tool at the same folder and it just works.
AI agents can organize, rewrite, link, and summarize — but every agent edit is reversible. Full undo, always. The agent proposes; you keep control.
Everything local is free (macOS, Windows, Linux, plus an npm CLI). The only paid part is the optional relay for syncing across machines.

Why local-first: if the company behind your notes app disappears (including mine), you should lose nothing. With Ferrow you'd still have a folder of Markdown files.

We launched on Product Hunt today: https://www.producthunt.com/products/ferrow

Or grab it directly: https://ferrow.ai/?ref=devto — the code PRODUCTHUNT gets 30% off 3 months of the relay if you want the synced setup.

Happy to answer anything about the reversibility design or the local-first tradeoffs in the comments.

DEV Community: Chris Ruzylo

I built Ferrow: a local-first Markdown vault where every AI edit is undoable