Tolaria is an open-source desktop app for Markdown knowledge bases built with Tauri, React and TypeScript. The October 25 alpha releases added browser-side note and vault sharing, view-only access and revocation, alongside work to keep edits converged across devices. That is a concrete alternative to putting every personal note into a proprietary cloud editor.
The project is still explicitly alpha, with a rapid release cadence and the usual risk of rough edges. A sensible test is to create a small disposable vault containing a few Markdown files, open it on the Mac, and inspect the actual files on disk. Then try sharing one non-sensitive note and revoking access.
What to do: bookmark the official release feed, download the Apple Silicon build only if you enjoy beta software, and compare its Markdown portability against Apple Notes or your current project documentation. Keep backups and avoid making it the only home for important material.