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Neodisk vs WhatSize: catalog facts
Neodisk	WhatSize
Free Free and open source.	Paid Shareware costing $14.99, with a $9.99 upgrade price and a 30-day free trial.
macOS	macOS
Treemap, flat and sunburst views of disk usage Read-only, so it cannot delete files	Largest files and folders listed first Finder-style column view for drilling into folders
macOS only Cleanup has to be done elsewhere since it never deletes	macOS only Paid after the 30-day trial
Downloadable app	Downloadable app
Open source	Closed 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.