Compare software

WhatSize vs OpenDisk: catalog facts
WhatSize	OpenDisk
Paid Shareware costing $14.99, with a $9.99 upgrade price and a 30-day free trial.	Free Free and open source under the MIT licence.
macOS	macOS
Largest files and folders listed first Finder-style column view for drilling into folders	Interactive sunburst view with one-click cleanup Incremental repeat scans
macOS only Paid after the 30-day trial	macOS only Requires macOS 15 Sequoia or later
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
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 2, 2026

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