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

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