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WinDirStat vs K4DirStat: catalog facts
WinDirStat	K4DirStat
Free Free and open source under the GPL 2.0.	Free Free to use, with source code published on GitHub.
Windows	Linux
Treemap makes one enormous file obvious at a glance Finds duplicates by hash and compares logical against physical size	Shows directory sizes both as a list and as a treemap Works like a graphical version of du
Windows only The treemap is dense and takes a moment to learn to read	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: GPL-2.0	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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