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

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