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SpaceSniffer vs gdu: catalog facts
SpaceSniffer	gdu
Free Freeware with donations welcomed. The source code is not published.	Free The open-source application is available without a license fee.
Windows	Windows, macOS, Linux
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	Interactive size inspection with parallel scans
Windows only Closed source freeware	Parallel scanning offers less benefit on mechanical disks.
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 22, 2026

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