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Logseq vs Lemma: catalog facts
Logseq	Lemma
Freemium The app is free and open source under the AGPL 3.0. Logseq Sync is a paid service, and…	Free Free and open source under the GPL-3.0-or-later licence, with optional donations.
Windows, macOS, Linux, Android, iOS	Linux
Notes are plain Markdown files in a folder you control Block-level linking and embedding, not just page links	Inline math entry with LaTeX-like autocomplete Wiki-style linking with backlinks
The database version is in beta and the project warns data loss is possible Outliner structure does not suit long-form prose	Linux only No sync described on the homepage
Downloadable app	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.