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dupeGuruPeriscope
Free

Free and open source under the GPL 3.0.

 Free

Periscope is free and open source under GPL-3.0.

Windows, macOS, Linux Command line
  • Fuzzy image matching finds resized and re-encoded copies
  • Separate music mode that compares tags rather than bytes
  • Interactive exploration of duplicate files
  • Safe deletion commands require another copy
  • Last release was July 2022 and the project is asking for maintainers
  • Fuzzy matching is slow on very large photo collections
  • Requires an initial filesystem scan
  • Designed for command-line use
Downloadable app Downloadable app
Open source Open source
License: GPL-3.0 License: GPL-3.0
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 21, 2026

Checked October 8, 2026

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