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Duc vs QDirStat: catalog facts
Duc	QDirStat
Free Free and open source.	Free Free and open source under the GPL version 2.
Linux, Command line	macOS, Linux
Scales to hundreds of millions of files Fast browsing from a stored index	Treemap plus tree view of disk usage No KDE dependencies
Results reflect the last index run, not live disk state Other systems need to build from source	No Windows version Interface is dense for casual users
Downloadable app	Downloadable app
Open source	Open source
License: LGPL-3.0	License: GPL-2.0
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.