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Neodisk vs GrandPerspective: catalog facts
Neodisk	GrandPerspective
Free Free and open source.	Free Free and open source under the GPL.
macOS	macOS
Treemap, flat and sunburst views of disk usage Read-only, so it cannot delete files	Saved scans can be compared to see what grew since last time Deletes or reveals a file straight from the map
macOS only Cleanup has to be done elsewhere since it never deletes	macOS only, and the interface is deliberately plain
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0
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 October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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