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SiYuan vs Lemma: catalog facts
SiYuan	Lemma
Freemium Most features are free, including for commercial use. The official cloud sync and assets…	Free Free and open source under the GPL-3.0-or-later licence, with optional donations.
Windows, macOS, Linux, Android, iOS, Self-hosted	Linux
Block-level references and two-way links with custom attributes SQL queries embedded inside notes for building your own views	Inline math entry with LaTeX-like autocomplete Wiki-style linking with backlinks
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	Linux only No sync described on the homepage
Downloadable app, Self-hosted	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-3.0-or-later
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 1, 2026

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