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GrandPerspective vs WhatSize: catalog facts
GrandPerspective	WhatSize
Free Free and open source under the GPL.	Paid Shareware costing $14.99, with a $9.99 upgrade price and a 30-day free trial.
macOS	macOS
Saved scans can be compared to see what grew since last time Deletes or reveals a file straight from the map	Largest files and folders listed first Finder-style column view for drilling into folders
macOS only, and the interface is deliberately plain	macOS only Paid after the 30-day trial
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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