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

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