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Duc vs pdu (parallel-disk-usage): catalog facts
Duc	pdu (parallel-disk-usage)
Free Free and open source.	Free Free and open source with no paid tier.
Linux, Command line	Command line
Scales to hundreds of millions of files Fast browsing from a stored index	Parallel scanning for quick results on large directory trees Visual size chart directly in the terminal
Results reflect the last index run, not live disk state Other systems need to build from source	Terminal only, with no graphical interface Reports usage but does not delete or move files
Downloadable app	Downloadable app
Open source	Open source
License: LGPL-3.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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