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Hydrus NetworkTagStudio
Free

Free, with source published on GitHub.

 Free

Free and open source with no paid tier.

Windows, macOS, Linux, Self-hosted Windows, macOS, Linux
  • Tag-based search across very large collections
  • Imports files and tags from disk and websites
  • Tag-based organization on top of your existing files
  • Does not lock files into a proprietary format
  • Takes time to learn compared with ordinary photo libraries
  • Interface is dense and built for power users
  • Still evolving, so features and library format may change
  • Organizing a large collection with tags takes manual effort
Downloadable app, Self-hosted Downloadable app
Closed source Open source
License: WTFPL License: GPL-3.0
No account needed No account needed
Works offline Works offline

Checked September 24, 2026

Checked October 1, 2026

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