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

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