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Outline vs HackMD: catalog facts
Outline	HackMD
Freemium Hosted plans are paid. Self-hosting is possible under the source-available Business Source…	Freemium Free to start, with paid plans for teams.
Web, Self-hosted	Web
Fast collaborative editor with slash commands and nested collections	Real-time collaborative Markdown editing Works in any browser with no install
Source-available under the Business Source License, not open source The hosted plan is paid and self-hosting needs Postgres, Redis and object storage	Notes live on a hosted service rather than local files Increasing focus on AI agent features may not suit everyone
Self-hosted, Web application, Hosted service	Web application
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.