Markdown Library ML‑42
A native macOS reader and editor for the markdown files already on your disk. Point it at any folder — a git repo, a docs directory, an Obsidian vault — and read, search, and edit across projects. No import, no database; files stay where they are.
Native macOS · macOS 26+ · Apple Silicon and Intel
$12.99 · Mac · buy once
Introductory price — it goes up later.
Coming to the Mac App Store.
Document View
Every file deserves to be read properly
Your markdown files carry the context that makes AI work — architecture docs, decision records, project briefs, specs. ML-42 renders them as clean, navigable documents — fast. The sidebar shows your project tree. The inspector gives you a table of contents and an on-device summary from Apple Intelligence. You're reading your library, not staring at syntax.
Folder Overview
Navigate like a browser
Open any folder and see your documents as cards with excerpts and modification dates. Click into a file, read it, hit back. Forward and back history works across files and folders — just like a web browser. Breadcrumbs in every header. Favorites for quick access. The more projects you add, the more useful it gets.
Command Palette
Find anything in seconds
Cmd+K searches across every project at once — by filename and by content. Each hit shows its project and path, so you can jump from a memory file in one repo to a blog draft in another without losing your place.
Fast Preview
Documents render instantly
Open a file and it's already rendered. Headings, code, tables, front matter — all styled, no delay. Scroll a thousand-line document and it stays buttery. The preview is the default view, and it never makes you wait.
Fast Raw Editing
Raw markdown at native speed
Flip to raw with a keystroke and edit plain text the way it was meant to be edited — no rendering layer between your fingers and the file. Switching back is instant.
On-Device Summaries
Apple Intelligence in the inspector
Every document gets a short summary generated automatically by Apple Intelligence, on-device. Nothing leaves your machine. Glance at the inspector to know what a file is about before you open it.
Command Palette
Find anything, anywhere
Cmd+K searches across all your projects at once — by filename and by content. Jump to any document in any project in seconds.
File Watching
Always the latest version
When an AI agent or another editor modifies a file, ML-42 detects the change and reloads automatically. What you see is what's on disk.
No database. No sync layer. No subscription. Nothing leaves your machine.
Philosophy
Nothing between you and your files
Code editors treat markdown as just another text file. Note-taking apps want to own your data. Preview tools are read-only. None of them are designed for the actual workflow: open a project folder, browse its documents, read and edit naturally, move on to the next.
ML-42 opens your folders where they are. No import, no database, no proprietary format. The context files that shape AI behavior, the specs that define what to build, the artifacts agents produce — all markdown. When files change on disk, ML-42 picks up the change automatically. When you close the app, your files are exactly where you left them.
The format is the interface. ML-42 just makes it better to work with.
Buy it once. It's yours — no database, no sync to rent, no subscription. Native macOS.
$12.99 · Mac · buy once
Introductory price — it goes up later.
Coming to the Mac App Store.
Requires macOS 26 or later. Apple Silicon or Intel. On-device summaries use Apple Intelligence.
Read the documentation →Questions
Do I have to import my files?
No. Point ML-42 at any folder that already exists — a git repo, a docs directory, an Obsidian vault — and it reads and edits the files in place. No import, no database, no proprietary format.
Is there a subscription?
No. You buy ML-42 once and it is yours — no accounts, no telemetry, no recurring fee.
Does it change my files?
Only when you edit them. When an AI agent or another editor changes a file, ML-42 detects it and reloads automatically, so you always see what is on disk.
What do I need to run it?
macOS 26 or later, on Apple Silicon or Intel. The on-device summaries use Apple Intelligence.
How is it different from Obsidian or VS Code?
There is no vault to adopt and no sync to rent. ML-42 opens the folders you already have and is built for reading and editing across many projects at once, with file-watching and on-device summaries.