Comparison

ML-42 vs iA Writer

iA Writer is a $49.99 focused writing instrument, sold separately per platform; ML-42 is a $12.99 app for reading and living with the markdown files you already have.

Last updated: 2026-08-28 · iA Writer facts checked against ia.net/writer and the App Store on that date.

ML-42 is a native macOS app for reading and editing markdown files already on disk, across as many folders and projects as you want, for $12.99 once.

iA Writer is a focused writing app for plain-text markdown, with Focus Mode, style feedback, and a design pedigree few writing tools can match — sold once per platform, starting at $49.99 on Mac.

Dimension	ML-42	iA Writer
Interface	One pane: a file list and the note, open on launch	Focus Mode dims everything but the current sentence or paragraph — an interface built to disappear while you write
Storage model	Plain .md files in your existing folders; nothing added	Plain-text markdown files in your folders too; no proprietary database
Works on existing folders	Yes — that's the product	Yes, but built around composing a document, not browsing many at once
Platforms	macOS 26 or later, Mac only	macOS, iPhone/iPad, Windows, and Android
Price	$12.99 one-time (introductory; will rise) — one purchase for Mac	$49.99 on Mac, $19.99 on iPhone/iPad — each platform sold separately
Writing tools	None — reading and light editing, not composition tools	Focus Mode, syntax highlighting by part of speech, Style Check for clichés and filler, Authorship tracking for pasted or AI-written text
Multi-project	Many folders open side by side, one search across all of them	Built around one document at a time, not browsing a folder of files an agent might be editing
File-watching / AI edits	FSEvents-based, auto-reloads when a file changes externally	No comparable pitch about external or AI edits appearing live
Track record	New app, currently version 1.1	Apple Editors' Choice and 4x "Best of App Store"; v8 shipped a Liquid Glass redesign for macOS 26
Sync	None built in — use whatever already syncs your folders	None built in either — your folders, your sync
AI-agent workflow	Built for it — file-watching auto-reloads agent edits; on-device summaries; search skips build and dependency folders	Files are agent-editable too, but the app's framing is composing prose, not watching a folder change
Learning curve	Small, by design — open a folder, read, edit	Small too — the discipline is in the writing tools, not the setup

What you see when you open each app

Open ML-42 and you're reading the folder you pointed it at immediately — a file list and the note itself, one pane, nothing to configure first.

Open iA Writer and Focus Mode is ready to dim everything but the sentence or paragraph you're on, syntax highlighted by part of speech, built to disappear around your writing. It's one of the most disciplined writing environments available, and it's built around composing a document, not browsing a folder of them.

The category's prestige name

iA Writer's reputation is real, and worth stating plainly: Apple Editors' Choice, named "Best of App Store" four times, and its v8 release shipped a Liquid Glass redesign for macOS 26 with a Document Outline and Command Palette. Focus Mode, part-of-speech syntax highlighting, Style Check for clichés and filler, and Authorship tracking for pasted or AI-written text are a genuinely disciplined toolkit for writing prose.

ML-42 doesn't compete on any of that — it has no writing tools at all. The comparison is honest about the gap: if composing is the job, iA Writer is built for it in a way ML-42 isn't trying to be.

A 4x price gap, for a different job

iA Writer is $49.99 on Mac, and iPhone or iPad is a separate $19.99 purchase — each platform sold on its own. ML-42 is $12.99 once, for Mac, an introductory price that will rise later.

The gap isn't really about features so much as what each app is for: iA Writer is priced as a writing instrument you invest in once and use for years of composing. ML-42 is priced as a reading and editing companion for files that already exist for other reasons — a repo, a docs directory, the context files an AI agent reads and writes.

Composing one document vs watching a folder

ML-42 watches the files it's showing you with FSEvents and reloads automatically when an AI agent or another editor changes one on disk — a folder full of files someone or something else is writing into stays current without you doing anything. iA Writer has no comparable pitch; its framing is a document you're composing, not a folder you're keeping an eye on.

Both are honest about what they're not: iA Writer isn't trying to be a multi-project browser, and ML-42 isn't trying to be a writing instrument.

ML-42 is not a writing tool. It's a reader and editor for folders that exist for other reasons — repos, docs directories, agent context. If writing is the job, iA Writer may simply be the better category fit; ML-42 competes when the files already exist and need to stay where they are.

Choose iA Writer if

Writing is the job — drafting essays, posts, or documentation — and you want the most disciplined editor for it.
You value style feedback, like clichés, redundancy, and parts of speech, while you write.
You want the same trusted writing environment on Mac, iPhone, and iPad.

Choose ML-42 if

Your files already live in folders other tools and AI agents write into, and you want to read and browse across many of them, not compose one document.
You want one purchase to cover your Mac, not a separate purchase per platform.
You're not choosing a writing instrument — you're choosing how to live with markdown files that already exist.

Also see ML-42 vs Typora · ML-42 vs Obsidian · ML-42 vs Bear

Buy it once. It's yours — no database, no sync to rent, no subscription. Native macOS.

Learn more about ML-42