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OmniDiskSweeper vs WhatSize: catalog facts
OmniDiskSweeper	WhatSize
Free Free download from The Omni Group.	Paid Shareware costing $14.99, with a $9.99 upgrade price and a 30-day free trial.
macOS	macOS
Plain list of files sorted by size Trash or open files directly from the list	Largest files and folders listed first Finder-style column view for drilling into folders
macOS only List view only, no treemap or chart	macOS only Paid after the 30-day trial
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 September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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