Compare software

ReadCube PapersI, Librarian
Paid

Paid product with a free trial.

 Freemium

The open source version is free to self-host; the hosted and professional editions are…

Web, Browser extension Web, Self-hosted
  • PDF annotation combined with reference management
  • Imports papers with full metadata and citations
  • Imports references from major academic databases
  • Boolean search and bulk tagging for literature reviews
  • Paid after the trial
  • Much of the product is aimed at companies and research teams
  • Needs Apache and PHP when installed manually
  • AI research features belong to the commercial edition
Downloadable app, Web application, Browser extension Self-hosted, Hosted service
Closed source Open source
License not stated License: GPL-3.0
Account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked October 2, 2026

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