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GrandPerspective vs gdu: catalog facts
GrandPerspective	gdu
Free Free and open source under the GPL.	Free The open-source application is available without a license fee.
macOS	Windows, macOS, Linux
Saved scans can be compared to see what grew since last time Deletes or reveals a file straight from the map	Interactive size inspection with parallel scans
macOS only, and the interface is deliberately plain	Parallel scanning offers less benefit on mechanical disks.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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