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