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Bookends vs Citations: catalog facts
Bookends	Citations
Paid Commercial software sold through the developer's site.	Free Free and open source under the GPL-3.0 or later.
macOS, iOS	Linux
Imports from many academic databases Citation tools for Word, Mellel and Nisus Writer Pro	Works directly with plain BibTeX files Native GNOME interface
Mac and iOS only Paid, unlike Zotero	Linux only Limited to the BibTeX format
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
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 2, 2026	Official website Full listing and sources Checked October 1, 2026

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