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fdupes vs Periscope: catalog facts
fdupes	Periscope
Free Free and open source.	Free Periscope is free and open source under GPL-3.0.
macOS, Linux, Command line	Command line
Finds duplicates by file content Interactive or automatic deletion	Interactive exploration of duplicate files Safe deletion commands require another copy
Terminal only, with no graphical interface Deleting files needs care to avoid removing the wrong copy	Requires an initial filesystem scan Designed for command-line use
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 8, 2026

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