Markdown Library ML-42 is on the Mac App Store today. Point it at any folder you already have — a git repo, a docs directory, an Obsidian vault — and read, search, and edit the markdown inside it. No import, no database, no account. The folder you open is the library.
Download ML-42 on the Mac App Store — $12.99, one time, no subscription.
The job it does
Markdown became the medium of AI-assisted work without anyone deciding it should. The CLAUDE.md that shapes an agent’s behaviour, the spec that says what to build, the decision record that says why — all plain text, scattered across every project you touch. Those files reward being read well, and most tools either treat them as raw syntax or ask you to import them into a vault before they’ll help.
ML-42 opens them where they are. Add a folder as a project and its documents show up as cards with excerpts and modification dates. Click one and it renders instantly — headings, code, tables, front matter. Flip to raw markdown with a keystroke to edit, and flip back just as fast. Cmd+K searches every project at once, by filename and by content, so a spec in one repo sits a keystroke away from notes in another.
The feature we lean on most is file-watching. When an agent rewrites a document while you’re reading it, ML-42 reloads the file in place — no refresh, no stale copy, no diff to babysit. That turns out to be the day-to-day job once your corpus is something a coding agent edits every few minutes.
Every document also gets a short summary from Apple Intelligence, generated on-device. Nothing leaves your machine: ML-42 is sandboxed, makes no network requests, and keeps no telemetry.
What it costs
ML-42 is $12.99, an introductory price, Mac only, bought once. No subscription, no server, no sync to rent — your iCloud or git already handles sync. You own the app and the version you bought, the same way you own the files. The introductory price goes up later; there’s no countdown, only the plain fact that it won’t stay here.
It runs on macOS 26 or later, on Apple Silicon or Intel.
Where it sits
ML-42 is the reading and editing surface in a small set of tools that all speak plain markdown — capture in SR-7, reading and editing in ML-42, with TR-2 handling tasks on the way. The same files on disk, the same files your AI already edits, no vault to adopt to get there.
If your markdown is scattered across more folders than any one app wants to own, that scattering is exactly what ML-42 is built for. See ML-42, or read the documentation for the full feature reference.