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GrandPerspective vs OmniDiskSweeper: catalog facts
GrandPerspective	OmniDiskSweeper
Free Free and open source under the GPL.	Free Free download from The Omni Group.
macOS	macOS
Saved scans can be compared to see what grew since last time Deletes or reveals a file straight from the map	Plain list of files sorted by size Trash or open files directly from the list
macOS only, and the interface is deliberately plain	macOS only List view only, no treemap or chart
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	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 23, 2026

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