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Periscope vs jdupes: catalog facts
Periscope	jdupes
Free Periscope is free and open source under GPL-3.0.	Free Free and open source under the MIT licence.
Command line	Windows, macOS, Linux, Command line
Interactive exploration of duplicate files Safe deletion commands require another copy	Fast duplicate detection across large folders Can replace duplicates with hard links or symlinks
Requires an initial filesystem scan Designed for command-line use	Command-line only, with no graphical interface Deletion options need care to avoid removing wanted files
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 October 2, 2026

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