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WhatSize vs Neodisk: catalog facts
WhatSize	Neodisk
Paid Shareware costing $14.99, with a $9.99 upgrade price and a 30-day free trial.	Free Free and open source.
macOS	macOS
Largest files and folders listed first Finder-style column view for drilling into folders	Treemap, flat and sunburst views of disk usage Read-only, so it cannot delete files
macOS only Paid after the 30-day trial	macOS only Cleanup has to be done elsewhere since it never deletes
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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