Composer vs MarkText

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.

MarkText is a free, open-source desktop Markdown editor that displays formatted text as you write. It offers WYSIWYG preview and source-code editing, plus focus and typewriter modes. Writing features include tables, KaTeX math, diagrams, footnotes, code highlighting, and YAML, TOML, and JSON front matter. Listed diagram tools include Mermaid, Vega, and Vega-Lite. The editor has 33 light and dark themes, with CSS customization available. Documents can be exported as PDF or self-contained HTML, and local files are supported. MarkText runs on Linux, macOS, and Windows. Installation notes require macOS 11 or later and Windows 10 or 11, and provide arm64 and x64 installers for those systems. Homebrew, Chocolatey, and Winget are also listed as installation options. The homepage says MarkText needs no account and has no tracking. It is released under the MIT License, has no subscription, and is described as a volunteer-built project.