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WinDirStat vs SpaceSniffer: catalog facts
WinDirStat	SpaceSniffer
Free Free and open source under the GPL 2.0.	Free Freeware with donations welcomed. The source code is not published.
Windows	Windows
Treemap makes one enormous file obvious at a glance Finds duplicates by hash and compares logical against physical size	A treemap makes the biggest space consumers obvious at a glance Drill down with one click, zoom with a double-click, filter by file type
Windows only The treemap is dense and takes a moment to learn to read	Windows only Closed source freeware
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 September 21, 2026

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