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Lemma vs SiYuan: catalog facts
Lemma	SiYuan
Free Free and open source under the GPL-3.0-or-later licence, with optional donations.	Freemium Most features are free, including for commercial use. The official cloud sync and assets…
Linux	Windows, macOS, Linux, Android, iOS, Self-hosted
Inline math entry with LaTeX-like autocomplete Wiki-style linking with backlinks	Block-level references and two-way links with custom attributes SQL queries embedded inside notes for building your own views
Linux only No sync described on the homepage	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
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License: GPL-3.0-or-later	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 1, 2026	Official website Full listing and sources Checked September 21, 2026

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