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GrandPerspective vs OpenDisk: catalog facts
GrandPerspective	OpenDisk
Free Free and open source under the GPL.	Free Free and open source under the MIT licence.
macOS	macOS
Saved scans can be compared to see what grew since last time Deletes or reveals a file straight from the map	Interactive sunburst view with one-click cleanup Incremental repeat scans
macOS only, and the interface is deliberately plain	macOS only Requires macOS 15 Sequoia or later
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: MIT
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 October 2, 2026

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