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SiYuan vs Note Mark: catalog facts
SiYuan	Note Mark
Freemium Most features are free, including for commercial use. The official cloud sync and assets…	Free Free and open source; the developer accepts donations.
Windows, macOS, Linux, Android, iOS, Self-hosted	Web, Self-hosted
Block-level references and two-way links with custom attributes SQL queries embedded inside notes for building your own views	Minimal and fast web interface Self-hosted, so notes stay on your server
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	You need to run and maintain your own server Smaller feature set than larger note platforms
Downloadable app, Self-hosted	Self-hosted
Open source	Open 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 October 2, 2026

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