Composer vs Dillinger

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.

Dillinger is a free web-based Markdown editor with live preview, cloud sync, and no signup requirement. Its Monaco editor includes syntax highlighting, multiple cursors, find and replace, and autocompletion. A side-by-side preview renders Markdown as you type and keeps scrolling aligned with the editor. Documents can be imported by drag and drop and exported as Markdown, styled HTML, or PDF. Dillinger also imports and saves files through GitHub, Dropbox, Google Drive, OneDrive, and Bitbucket; GitHub support covers public and private repositories and lets users save edits back. After the initial load, the editor works offline and keeps drafts in local storage, although cloud sync requires connectivity. Other options include dark mode, fullscreen Zen mode, and Vim and Emacs keybindings. The site describes use by developers, technical writers, and AI builders writing READMEs, documentation, blog posts, and LLM prompts. Documents save automatically in the browser, and the features page says data is not stored on Dillinger’s servers. The Free plan is free, with no signup, paywall, or usage limits.