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QDirStat vs Space Radar: catalog facts
QDirStat	Space Radar
Free Free and open source under the GPL version 2.	Free Free and open source under the MIT licence.
macOS, Linux	Windows, macOS, Linux
Treemap plus tree view of disk usage No KDE dependencies	Three chart types: sunburst, treemap and flamegraph Shows results while the scan is still running
No Windows version Interface is dense for casual users	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
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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