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SiYuan vs Notion: catalog facts
SiYuan	Notion
Freemium Most features are free, including for commercial use. The official cloud sync and assets…	Freemium Free tier for individuals; paid plans add team features and higher limits.
Windows, macOS, Linux, Android, iOS, Self-hosted	Windows, macOS, Android, iOS, Web
Block-level references and two-way links with custom attributes SQL queries embedded inside notes for building your own views	Highly flexible structure covers notes, databases, and project boards in one app Real-time collaboration for team use
Notes live in the app's own store rather than plain files in a folder The interface has a lot of concepts to learn at once	Flexibility comes with a learning curve to set up well Can feel heavier and slower than single-purpose notes apps
Downloadable app, Self-hosted	Downloadable app, Web application
Open source	Closed source
License: AGPL-3.0	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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