Compare software

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

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