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CodiMD
AGPL-3.0CodiMD is an open-source, self-hosted alternative to Google Docs for real-time collaborative Markdown editing on your own infrastructure.
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Overview
CodiMD is a self-hosted web application for real-time collaborative Markdown authoring and team notes. It keeps documents on private infrastructure while synchronizing multi-user edits instantly across browser sessions. Authors write in plain text alongside an immediate rendered preview, combining multi-cursor collaboration with complete data ownership.
Why CodiMD instead of Google Docs
Google Docs delivers collaborative word processing through a multi-tenant cloud service where Google manages uptime and retains custody of all document data. That managed architecture eliminates server administration, but it subjects organizational records to vendor data policies, remote outages, and ongoing per-seat subscriptions. In contrast, CodiMD runs directly on internal servers or private virtual machines using Docker or Node.js. System administrators connect the service to PostgreSQL or MySQL databases, configure storage via MinIO or Amazon S3, and integrate internal authentication through LDAP or SAML. Every draft, revision, and uploaded asset stays strictly behind the company perimeter.
The operational tradeoff lies in administrative responsibility and formatting scope. Operating CodiMD requires managing database migrations, scheduling backups, configuring TLS certificates, and monitoring server memory. Furthermore, while Google Docs provides a full office suite with print pagination, rich WYSIWYG styling, and threaded suggestion sidebars, CodiMD operates strictly on structured Markdown text. Transitioning a team from Google Docs to CodiMD means adopting plain-text conventions rather than arbitrary font toolbars. In return, operations teams gain predictable local resource usage, scriptable document workflows, and freedom from cloud vendor lock-in.
What it does well
- Split-screen live preview updates rendered formatting alongside raw text as you type, helping writers verify headings, bulleted lists, and tables without guessing syntax.
- Real-time multi-cursor collaboration displays coworker locations and avatar tags across the document, keeping teams aligned during joint writing sessions.
- Built-in slide presentation mode automatically turns sections separated by slide delimiters into presentation decks, saving users from copying notes into external slide tools.
- Versatile export options allow one-click downloads to plain Markdown, standalone HTML, or printable PDF, ensuring notes remain readable on any device.