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GrandPerspective vs Space Radar: catalog facts
GrandPerspective	Space Radar
Free Free and open source under the GPL.	Free Free and open source under the MIT licence.
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	Three chart types: sunburst, treemap and flamegraph Shows results while the scan is still running
macOS only, and the interface is deliberately plain	Documentation is limited to the README Small hobby project without a dedicated website
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.