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WizTree vs SpaceSniffer: catalog facts
WizTree	SpaceSniffer
Freemium Free for personal use. Commercial use, or removing the Donate button, requires a paid…	Free Freeware with donations welcomed. The source code is not published.
Windows	Windows
Reads the NTFS master file table, so scans finish in seconds rather than minutes Treemap view of the whole drive alongside a sorted file and folder list	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
Closed source The MFT trick only applies to NTFS; other file systems fall back to a normal scan	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 20, 2026	Official website Full listing and sources Checked September 21, 2026

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