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PdfDingI, Librarian
Free

Free and open source; donations are accepted.

 Freemium

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

Web, Self-hosted Web, Self-hosted
  • Resumes reading position across devices
  • Workspaces, collections and nested tags
  • Imports references from major academic databases
  • Boolean search and bulk tagging for literature reviews
  • Requires running your own server
  • Focused on PDFs only
  • Needs Apache and PHP when installed manually
  • AI research features belong to the commercial edition
Self-hosted Self-hosted, Hosted service
Open source Open source
License: AGPL-3.0 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

Checked October 2, 2026

Checked October 2, 2026

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