Vault
Your notes stay on your device
Notes are plain JSON in a Vault folder you can see, back up, and sync yourself. No cloud backend, no forced account. Whether anything ever goes online is entirely your call.
Built for data safety
Local files are only a feature if they're hard to lose. The Vault treats your notes like the only copy — because it might be.
A folder, not a database
The Vault lives at ~/Documents/Zyler Vault by default — a normal folder you can open in Finder or Explorer, move, or point anywhere.
Atomic writes
Every save writes to a temp file and swaps it in whole, so a crash mid-save can't leave a half-written note.
Version snapshots
Zyler keeps point-in-time snapshots of each note, so an over-eager edit — yours or the AI's — is always recoverable.
External-change detection
Edit a note's file from outside — a script, a sync client, another machine — and Zyler notices and reloads instead of clobbering it.
Sync it yourself
Drop the Vault into iCloud, Dropbox, Syncthing, or a Git repo. Zyler never manages sync for you — which means no vendor to outgrow.
No account, no backend
The app runs entirely on your machine. Whether anything ever goes online — sync, AI, or nothing — is your call.
An honest word on the format
Zyler's files are ProseMirror JSON, not Markdown — here's what that means and how you leave.
ProseMirror JSON, on purpose
Notes are .zyler.json files — a lossless format for blocks Markdown can't round-trip: toggles, columns, tables, block references.
Markdown in and out
Import a folder of .md files — an Obsidian vault included — and export any note back to Markdown whenever you want out.
Files you can script
Every note is readable JSON: diff it, grep it, back it up, or feed it to your own tools. Nothing is locked away.
Open a Vault and own your notes
Download Zyler, pick a folder, and everything you write from then on is a file of yours.