PlainMark Editor is a native Markdown editor for Mac, iPhone, and iPad, built and published by Commerce Beacon. It is on the App Store now, and it is a single-purchase app with no account, no subscription, and no cloud service behind it. Its own site is at plainmarkeditor.com.
Its defining property is what it does not do. Almost every Markdown editor reveals the raw syntax on whichever line your cursor is on — the hash appears on a heading, the asterisks appear around bold text, and the words shift sideways to make room. PlainMark Editor keeps those markers hidden while you write, and structurally cannot reveal them: the code that applies styling is never given the cursor position.
What PlainMark Editor solves
Writing and editing are different activities. Editors that surface syntax under the caret are optimising for editing, and they make drafting harder — the page rearranges itself every time the cursor moves. PlainMark Editor separates the two into a Source mode with a line-number gutter and a Formatted mode that stays still, both operating on the same file.
Documents stay as plain Markdown files on the device. Nothing is uploaded, and the app works with no connection.
Commerce Beacon scope
Commerce Beacon designed, built, and shipped the app end to end: the SwiftUI editor surface and Markdown styling engine, the shared document model across macOS, iOS, and iPadOS, the export pipeline covering print, PDF, PNG, RTF, HTML, DOCX, and plain text, the App Store listing and media, and the marketing site.
It is deliberately small. Tables, footnotes, math, and sync are all out of scope, and the app says so on its own product page rather than discovering it in a refund request.
Why it is in this portfolio
Most client work cannot be shown. PlainMark Editor can — it is a complete, public, inspectable piece of software that anyone can buy and form their own judgement about. It is the shortest honest answer to what Commerce Beacon builds and how narrowly it prefers to scope things.