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Paperpile vs Citations: catalog facts
Paperpile	Citations
Paid Paid subscription with a 30-day free trial.	Free Free and open source under the GPL-3.0 or later.
Android, iOS, Web, Browser extension	Linux
Built-in PDF viewer with annotation tools Citation plugins for Google Docs and Word	Works directly with plain BibTeX files Native GNOME interface
Requires a Google account Sign-up only on Chrome for now, Safari and Firefox in beta	Linux only Limited to the BibTeX format
Downloadable app, Web application, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Account 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 October 1, 2026

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