Compare software

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

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