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Bookup vs Lemma: catalog facts
Bookup	Lemma
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the GPL-3.0-or-later licence, with optional donations.
Linux	Linux
Notes written in Markdown Native GTK 4 interface for GNOME	Inline math entry with LaTeX-like autocomplete Wiki-style linking with backlinks
Linux only Small single-developer project with limited documentation	Linux only No sync described on the homepage
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	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 October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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