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WinDirStat vs Folder Size: catalog facts
WinDirStat	Folder Size
Free Free and open source under the GPL 2.0.	Freemium Free to use, with a paid registered edition available.
Windows	Windows
Treemap makes one enormous file obvious at a glance Finds duplicates by hash and compares logical against physical size	Bar and pie charts of disk usage Works on network shares and NAS devices
Windows only The treemap is dense and takes a moment to learn to read	Windows only Some functions tied to the paid registered edition
Downloadable app	Downloadable app
Open source	Closed 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 October 1, 2026

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