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K4DirStat vs Filelight: catalog facts
K4DirStat	Filelight
Free Free to use, with source code published on GitHub.	Free Free and open source under the GPL.
Linux	Windows, Linux
Shows directory sizes both as a list and as a treemap Works like a graphical version of du	The ring chart makes the biggest space consumers immediately obvious Scans remote and network locations as well as local disks
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	Pulls in KDE libraries on non-KDE desktops
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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