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FolderSizes vs Duc: catalog facts
FolderSizes	Duc
Freemium Free version available, with a paid Pro upgrade.	Free Free and open source.
Windows	Linux, Command line
Analyses network shares as well as local drives Scheduled reports with email delivery	Scales to hundreds of millions of files Fast browsing from a stored index
Windows only Some features require the paid Pro edition	Results reflect the last index run, not live disk state Other systems need to build from source
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: LGPL-3.0
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 24, 2026	Official website Full listing and sources Checked September 24, 2026

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