Composer vs StackEdit

Composer is a web-based, real-time Markdown editor where people and AI agents work on shared documents. Agents connect through MCP and join documents as collaborators, with permission to read and write shared content. Changes synchronize across teammates, devices, and sessions. Composer uses plain Markdown, keeping files readable in other editors, and supports Markdown export. The listed publishing workflow is none. Free users receive unlimited public documents and collaborators, plus up to seven private documents, three collaborators per private document, and a 10 MB upload limit. Pro removes the private-document and collaborator limits and adds early access to new features. Pro Annual costs $5.99 a month billed annually at $71.88 a year; Pro Monthly costs $7.99 a month billed monthly. Users can cancel anytime, with paid access continuing through the period. Stripe handles checkout.

StackEdit is an in-browser Markdown editor for writing, formatting and publishing documents. It highlights Markdown syntax and offers formatting controls alongside a live preview whose scrolling follows the editor. The site says it remains accessible for offline writing, and it supports local files as well as cloud sync with Google Drive, Dropbox and GitHub. Writers can share collaborative workspaces; when two collaborators edit the same file simultaneously, StackEdit merges their changes. Files also support inline comments and embedded discussions. The editor handles Markdown Extra, GitHub Flavored Markdown and CommonMark, with features configurable. It can publish blog posts to Blogger, WordPress and Zendesk, using Markdown, HTML or Handlebars-template formatting. Other supported content includes LaTeX mathematical expressions, sequence diagrams, flow charts, musical scores in ABC notation and emoji markup. Export formats are Markdown, HTML and PDF. StackEdit is listed as free and open source under an Apache License. Supported platforms include the web, a Chrome extension and self-hosting; the maker’s site displays a 2013–2019 copyright range.