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Note Mark vs SiYuan: catalog facts
Note Mark	SiYuan
Free Free and open source; the developer accepts donations.	Freemium Most features are free, including for commercial use. The official cloud sync and assets…
Web, Self-hosted	Windows, macOS, Linux, Android, iOS, Self-hosted
Minimal and fast web interface Self-hosted, so notes stay on your server	Block-level references and two-way links with custom attributes SQL queries embedded inside notes for building your own views
You need to run and maintain your own server Smaller feature set than larger note platforms	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
Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License not stated	License: AGPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 21, 2026

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