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WhatSize vs OmniDiskSweeper: catalog facts
WhatSize	OmniDiskSweeper
Paid Shareware costing $14.99, with a $9.99 upgrade price and a 30-day free trial.	Free Free download from The Omni Group.
macOS	macOS
Largest files and folders listed first Finder-style column view for drilling into folders	Plain list of files sorted by size Trash or open files directly from the list
macOS only Paid after the 30-day trial	macOS only List view only, no treemap or chart
Downloadable app	Downloadable app
Closed 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 September 23, 2026

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