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TreeSize Free vs WinDirStat: catalog facts
TreeSize Free	WinDirStat
Freemium TreeSize Free is free for private and commercial use. TreeSize Personal, Professional and…	Free Free and open source under the GPL 2.0.
Windows	Windows
Reads the NTFS master file table, so scans finish quickly Folder tree sorted by size, updating while it scans	Treemap makes one enormous file obvious at a glance Finds duplicates by hash and compares logical against physical size
Windows only and closed source Duplicate search, reports and exports need a paid edition	Windows only The treemap is dense and takes a moment to learn to read
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
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 21, 2026

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