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Zim vs Lemma: catalog facts
Zim	Lemma
Free Free and open source.	Free Free and open source under the GPL-3.0-or-later licence, with optional donations.
Windows, Linux	Linux
Notes stored as plain text files you can edit elsewhere Pages created simply by linking to them	Inline math entry with LaTeX-like autocomplete Wiki-style linking with backlinks
Uses its own wiki markup rather than Markdown Desktop only, with no built-in sync or mobile app	Linux only No sync described on the homepage
Downloadable app	Downloadable app
Open source	Open source
License not stated	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 23, 2026	Official website Full listing and sources Checked October 1, 2026

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