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Duc vs K4DirStat: catalog facts
Duc	K4DirStat
Free Free and open source.	Free Free to use, with source code published on GitHub.
Linux, Command line	Linux
Scales to hundreds of millions of files Fast browsing from a stored index	Shows directory sizes both as a list and as a treemap Works like a graphical version of du
Results reflect the last index run, not live disk state Other systems need to build from source	Built on Qt 5 and KDE Frameworks 5, so it fits a KDE desktop best Documentation lives in a GitHub wiki rather than a dedicated site
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.