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I, Librarian vs Bookends: catalog facts
I, Librarian	Bookends
Freemium The open source version is free to self-host; the hosted and professional editions are…	Paid Commercial software sold through the developer's site.
Web, Self-hosted	macOS, iOS
Imports references from major academic databases Boolean search and bulk tagging for literature reviews	Imports from many academic databases Citation tools for Word, Mellel and Nisus Writer Pro
Needs Apache and PHP when installed manually AI research features belong to the commercial edition	Mac and iOS only Paid, unlike Zotero
Self-hosted, Hosted service	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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