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K4DirStat vs Duc: catalog facts
K4DirStat	Duc
Free Free to use, with source code published on GitHub.	Free Free and open source.
Linux	Linux, Command line
Shows directory sizes both as a list and as a treemap Works like a graphical version of du	Scales to hundreds of millions of files Fast browsing from a stored index
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	Results reflect the last index run, not live disk state Other systems need to build from source
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: LGPL-3.0
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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