Compare software

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