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TreeSize Free vs SpaceSniffer: catalog facts
TreeSize Free	SpaceSniffer
Freemium TreeSize Free is free for private and commercial use. TreeSize Personal, Professional and…	Free Freeware with donations welcomed. The source code is not published.
Windows	Windows
Reads the NTFS master file table, so scans finish quickly Folder tree sorted by size, updating while it scans	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 and closed source Duplicate search, reports and exports need a paid edition	Windows only Closed source freeware
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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.