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SpaceSniffer vs Folder Size: catalog facts
SpaceSniffer	Folder Size
Free Freeware with donations welcomed. The source code is not published.	Freemium Free to use, with a paid registered edition available.
Windows	Windows
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	Bar and pie charts of disk usage Works on network shares and NAS devices
Windows only Closed source freeware	Windows only Some functions tied to the paid registered edition
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 October 1, 2026

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